CVE-2021-23133

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

The Linux Kernel, the operating system core itself.

Security Fix(es):

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-f232326f6966. This affects pointer types that do not define a ptr_limit.(CVE-2020-27170)

An issue was discovered in the Linux kernel before 5.11.8. kernel/bpf/verifier.c has an off-by-one error (with a resultant integer underflow) affecting out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory, aka CID-10d2bb2e6b1d.(CVE-2020-27171)

rtw_wx_set_scan in drivers/staging/rtl8188eu/os_dep/ioctl_linux.c in the Linux kernel through 5.11.6 allows writing beyond the end of the ->ssid[] array. NOTE: from the perspective of kernel.org releases, CVE IDs are not normally used for drivers/staging/* (unfinished work); however, system integrators may have situations in which a drivers/staging issue is relevant to their own customer base.(CVE-2021-28660)

A race condition was discovered in get_old_root in fs/btrfs/ctree.c in the Linux kernel through 5.11.8. It allows attackers to cause a denial of service (BUG) because of a lack of locking on an extent buffer before a cloning operation, aka CID-dbcc7d57bffc.(CVE-2021-28964)

In drivers/pci/hotplug/rpadlpar_sysfs.c in the Linux kernel through 5.11.8, the RPA PCI Hotplug driver has a user-tolerable buffer overflow when writing a new device name to the driver from userspace, allowing userspace to write data to the kernel stack frame directly. This occurs because add_slot_store and remove_slot_store mishandle drc_name '\0' termination, aka CID-cc7a0bb058b8.(CVE-2021-28972)

In intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c in the Linux kernel through 5.11.8 on some Haswell CPUs, userspace applications (such as perf-fuzzer) can cause a system crash because the PEBS status in a PEBS record is mishandled, aka CID-d88d05a9e0b6.(CVE-2021-28971)

An out-of-bounds (OOB) memory access flaw was found in x25_bind in net/x25/af_x25.c in the Linux kernel. A bounds check failure allows a local attacker with a user account on the system to gain access to out-of-bounds memory, leading to a system crash or a leak of internal kernel information. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.(CVE-2020-35519)

There is a flaw reported in drivers/gpu/drm/nouveau/nouveau_sgdma.c in nouveau_sgdma_create_ttm in Nouveau DRM subsystem. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker with a local account with a root privilege, can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.(CVE-2021-20292)

The bpf verifier in the Linux kernel did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. This issue was addressed in the upstream kernel in commit 9b00f1b78809 ("bpf: Fix truncation handling for mod32 dst reg wrt zero") and in Linux stable kernels 5.11.2, 5.10.19, and 5.4.101.(CVE-2021-3444)

An issue was discovered in the Linux kernel before 5.11.7. usbip_sockfd_store in drivers/usb/usbip/stub_dev.c allows attackers to cause a denial of service (GPF) because the stub-up sequence has race conditions during an update of the local and shared status, aka CID-9380afd6df70.(CVE-2021-29265)

An issue was discovered in the Linux kernel through 5.11.10.…

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: out-of-bounds reads in pinctrl subsystem (CVE-2020-0427)
• kernel: Improper input validation in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24502)
• kernel: Insufficient access control in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24503)
• kernel: Uncontrolled resource consumption in some Intel(R) Ethernet E810 Adapter drivers (CVE-2020-24504)
• kernel: Fragmentation cache not cleared on reconnection (CVE-2020-24586)
• kernel: Reassembling fragments encrypted under different keys (CVE-2020-24587)
• kernel: wifi frame payload being parsed incorrectly as an L2 frame (CVE-2020-24588)
• kernel: Forwarding EAPOL from unauthenticated wifi client (CVE-2020-26139)
• kernel: accepting plaintext data frames in protected networks (CVE-2020-26140)
• kernel: not verifying TKIP MIC of fragmented frames (CVE-2020-26141)
• kernel: accepting fragmented plaintext frames in protected networks (CVE-2020-26143)
• kernel: accepting unencrypted A-MSDU frames that start with RFC1042 header (CVE-2020-26144)
• kernel: accepting plaintext broadcast fragments as full frames (CVE-2020-26145)
• kernel: powerpc: RTAS calls can be used to compromise kernel integrity (CVE-2020-27777)
• kernel: locking inconsistency in tty_io.c and tty_jobctrl.c can lead to a read-after-free (CVE-2020-29660)
• kernel: buffer overflow in mwifiex_cmd_802_11_ad_hoc_start function via a long SSID value (CVE-2020-36158)
• kernel: slab out-of-bounds read in hci_extended_inquiry_result_evt() (CVE-2020-36386)
• kernel: Improper access control in BlueZ may allow information disclosure vulnerability. (CVE-2021-0129)
• kernel: Use-after-free in ndb_queue_rq() in drivers/block/nbd.c (CVE-2021-3348)
• kernel: Linux kernel eBPF RINGBUF map oversized allocation (CVE-2021-3489)
• kernel: double free in bluetooth subsystem when the HCI device initialization fails (CVE-2021-3564)
• kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)
• kernel: eBPF 32-bit source register truncation on div/mod (CVE-2021-3600)
• kernel: DoS in rb_per_cpu_empty() (CVE-2021-3679)
• kernel: Mounting overlayfs inside an unprivileged user namespace can reveal files (CVE-2021-3732)
• kernel: heap overflow in __cgroup_bpf_run_filter_getsockopt() (CVE-2021-20194)
• kernel: Race condition in sctp_destroy_sock list_del (CVE-2021-23133)
• kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode (CVE-2021-28950)
• kernel: System crash in intel_pmu_drain_pebs_nhm in arch/x86/events/intel/ds.c (CVE-2021-28971)
• kernel: protection can be bypassed to leak content of kernel memory (CVE-2021-29155)
• kernel: improper input validation in tipc_nl_retrieve_key function in net/tipc/node.c (CVE-2021-29646)
• kernel: lack a full memory barrier may lead to DoS (CVE-2021-29650)
• kernel: local escalation of privileges in handling of eBPF programs (CVE-2021-31440)
• kernel: protection of stack pointer against speculative pointer arithmetic can be bypassed to leak content of kernel memory (CVE-2021-31829)
• kernel: out-of-bounds reads and writes due to enforcing incorrect limits for pointer arithmetic operations by BPF verifier (CVE-2021-33200)
• kernel: reassembling encrypted fragments with non-consecutive packet numbers (CVE-2020-26146)
• kernel: reassembling mixed encrypted/plaintext fragments (CVE-2020-26147)
• kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check (CVE-2020-29368)
• kernel: flowtable list del corruption with kernel BUG at lib/list_debug.c:50 (CVE-2021-3635)
• kernel: NULL pointer dereference in llsec_key_alloc() in net/mac802154/llsec.c (CVE-2021-3659)
• kernel: setsockopt System Call Untrusted Pointer Dereference Information Disclosure (CVE-2021-20239)
• kernel: out of bounds array access in drivers/md/dm-ioctl.c (CVE-2021-31916)

• sctp: fix potential deadlock on &net->sctp.addr_wq_lock {CVE-2024-0639}
• sctp: delay auto_asconf init until binding the first addr {CVE-2021-23133}
• netfilter: nf_log: validate MAC header was set before dumping it {CVE-2026-52942}
• netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check {CVE-2026-52998}
• drm/nouveau: fix u32 overflow in pushbuf reloc bounds check {CVE-2026-46006}
• btrfs: fix use-after-free when attempting to join an aborted transaction {CVE-2025-21753}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• team: fix header_ops type confusion with non-Ethernet ports {CVE-2026-31502}
• xfrm: Fix dev use-after-free in xfrm async resumption {CVE-2026-72463}
• xfrm: hold dev ref until after transport_finish NF_HOOK {CVE-2026-31663}
• xen/privcmd: restrict usage in unprivileged domU {CVE-2026-31788}
• xen/privcmd: add IOCTL_PRIVCMD_RESTRICT {CVE-2026-31788}
• Bluetooth: L2CAP: make l2cap_connect() return void {CVE-2024-36013}
• btrfs: fix incorrect splitting in btrfs_drop_extent_map_range {CVE-2023-54121}
• netfilter: nf_conntrack: defer invalid log until after unlock {CVE-2026-74624}
• NFS: Pin the 'struct nfs_server' during a FREE_STATEID call {CVE-2026-74730}
• dm cache: fix flushing uninitialized delayed_work on cache_ctr error {CVE-2024-50280}
• audit: fix recursive locking deadlock in audit_dupe_exe() {CVE-2026-68096}
• RDMA/rxe: Reject unknown opcodes before ICRC processing {CVE-2026-46133}
• Bluetooth: bnep: reject short frames before parsing {CVE-2026-53253}
• net: pull headers in qdisc_pkt_len_segs_init() {CVE-2026-53091}
• inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP {CVE-2026-46266}
• Bluetooth: RFCOMM: validate skb length in MCC handlers {CVE-2026-53254}
• sched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed {CVE-2022-50103}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• fanotify: fix false positive on permission events {CVE-2026-46150}
• HID: usbhid: Eliminate recurrent out-of-bounds bug in usbhid_parse() {CVE-2025-38103}
• ext4: fix e4b bitmap inconsistency reports {CVE-2026-45942}
• Bluetooth: serialize accept_q access {CVE-2026-52918}
• ALSA: usb-audio: Add sanity check for OOB writes at silencing {CVE-2026-43279}
• RDMA/bnxt_re: zero shared page before exposing to userspace {CVE-2026-74584}
• sctp: keep chunk->transport in step with the list it is queued on {CVE-2026-74588}
• ipvs: clear IPv4 options after rebasing tunnel ICMP errors {CVE-2026-74669}
• wifi: cfg80211: Partial revert "wifi: cfg80211: Fix use after free for wext" {CVE-2023-53153}
• net/sched: cls_route: fix fastmap use-after-free on filter {CVE-2026-74583}
• nfs: use nfsi->rwsem to protect traversal of the file lock list {CVE-2026-72472}
• Bluetooth: RFCOMM: Fix session UAF in set_termios {CVE-2026-68188}
• drm/amdgpu/vce: fix integer overflow in image size {CVE-2026-68108}
• ALSA: seq: close a re-opened queue timer in the destructor {CVE-2026-68202}
• ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() {CVE-2026-74499}
• USB: serial: io_edgeport: cap received transmit credits {CVE-2026-68365}
• net: slip: serialize receive against buffer reallocation {CVE-2026-68143}
• wifi: cfg80211: cancel sched scan results work on unregister {CVE-2026-68414}
• sctp: fix auth_hmacs array size in struct sctp_cookie {CVE-2026-68376}
• sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid {CVE-2026-68320}
• pppoe: reload header pointer after dev_hard_header() {CVE-2026-68121}
• ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps() {CVE-2026-68160}
• libceph: refresh auth->authorizer_buf{,_len} after authorizer update {CVE-2026-68156}
• libceph: remove debugfs files before client teardown {CVE-2026-68153}
• libceph: Fix multiplication overflow in decode_new_up_state_weight() {CVE-2026-68158}
• libceph: reject zero bucket types in crush_decode {CVE-2026-68154}
• libceph: bound…

• sctp: fix potential deadlock on &net->sctp.addr_wq_lock {CVE-2024-0639}
• sctp: delay auto_asconf init until binding the first addr {CVE-2021-23133}
• netfilter: nf_log: validate MAC header was set before dumping it {CVE-2026-52942}
• netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check {CVE-2026-52998}
• drm/nouveau: fix u32 overflow in pushbuf reloc bounds check {CVE-2026-46006}
• btrfs: fix use-after-free when attempting to join an aborted transaction {CVE-2025-21753}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• team: fix header_ops type confusion with non-Ethernet ports {CVE-2026-31502}
• xfrm: Fix dev use-after-free in xfrm async resumption {CVE-2026-72463}
• xfrm: hold dev ref until after transport_finish NF_HOOK {CVE-2026-31663}
• xen/privcmd: restrict usage in unprivileged domU {CVE-2026-31788}
• xen/privcmd: add IOCTL_PRIVCMD_RESTRICT {CVE-2026-31788}
• Bluetooth: L2CAP: make l2cap_connect() return void {CVE-2024-36013}
• btrfs: fix incorrect splitting in btrfs_drop_extent_map_range {CVE-2023-54121}
• netfilter: nf_conntrack: defer invalid log until after unlock {CVE-2026-74624}
• NFS: Pin the 'struct nfs_server' during a FREE_STATEID call {CVE-2026-74730}
• dm cache: fix flushing uninitialized delayed_work on cache_ctr error {CVE-2024-50280}
• audit: fix recursive locking deadlock in audit_dupe_exe() {CVE-2026-68096}
• RDMA/rxe: Reject unknown opcodes before ICRC processing {CVE-2026-46133}
• Bluetooth: bnep: reject short frames before parsing {CVE-2026-53253}
• net: pull headers in qdisc_pkt_len_segs_init() {CVE-2026-53091}
• inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP {CVE-2026-46266}
• Bluetooth: RFCOMM: validate skb length in MCC handlers {CVE-2026-53254}
• sched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed {CVE-2022-50103}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• fanotify: fix false positive on permission events {CVE-2026-46150}
• HID: usbhid: Eliminate recurrent out-of-bounds bug in usbhid_parse() {CVE-2025-38103}
• ext4: fix e4b bitmap inconsistency reports {CVE-2026-45942}
• Bluetooth: serialize accept_q access {CVE-2026-52918}
• ALSA: usb-audio: Add sanity check for OOB writes at silencing {CVE-2026-43279}
• RDMA/bnxt_re: zero shared page before exposing to userspace {CVE-2026-74584}
• sctp: keep chunk->transport in step with the list it is queued on {CVE-2026-74588}
• ipvs: clear IPv4 options after rebasing tunnel ICMP errors {CVE-2026-74669}
• wifi: cfg80211: Partial revert "wifi: cfg80211: Fix use after free for wext" {CVE-2023-53153}
• net/sched: cls_route: fix fastmap use-after-free on filter {CVE-2026-74583}
• nfs: use nfsi->rwsem to protect traversal of the file lock list {CVE-2026-72472}
• Bluetooth: RFCOMM: Fix session UAF in set_termios {CVE-2026-68188}
• drm/amdgpu/vce: fix integer overflow in image size {CVE-2026-68108}
• ALSA: seq: close a re-opened queue timer in the destructor {CVE-2026-68202}
• ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() {CVE-2026-74499}
• USB: serial: io_edgeport: cap received transmit credits {CVE-2026-68365}
• net: slip: serialize receive against buffer reallocation {CVE-2026-68143}
• wifi: cfg80211: cancel sched scan results work on unregister {CVE-2026-68414}
• sctp: fix auth_hmacs array size in struct sctp_cookie {CVE-2026-68376}
• sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid {CVE-2026-68320}
• pppoe: reload header pointer after dev_hard_header() {CVE-2026-68121}
• ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps() {CVE-2026-68160}
• libceph: refresh auth->authorizer_buf{,_len} after authorizer update {CVE-2026-68156}
• libceph: remove debugfs files before client teardown {CVE-2026-68153}
• libceph: Fix multiplication overflow in decode_new_up_state_weight() {CVE-2026-68158}
• libceph: reject zero bucket types in crush_decode {CVE-2026-68154}
• libceph: bound…

• sctp: fix potential deadlock on &net->sctp.addr_wq_lock {CVE-2024-0639}
• sctp: delay auto_asconf init until binding the first addr {CVE-2021-23133}
• netfilter: nf_log: validate MAC header was set before dumping it {CVE-2026-52942}
• netfilter: nfnetlink_osf: fix potential NULL dereference in ttl check {CVE-2026-52998}
• drm/nouveau: fix u32 overflow in pushbuf reloc bounds check {CVE-2026-46006}
• btrfs: fix use-after-free when attempting to join an aborted transaction {CVE-2025-21753}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• team: fix header_ops type confusion with non-Ethernet ports {CVE-2026-31502}
• xfrm: Fix dev use-after-free in xfrm async resumption {CVE-2026-72463}
• xfrm: hold dev ref until after transport_finish NF_HOOK {CVE-2026-31663}
• xen/privcmd: restrict usage in unprivileged domU {CVE-2026-31788}
• xen/privcmd: add IOCTL_PRIVCMD_RESTRICT {CVE-2026-31788}
• Bluetooth: L2CAP: make l2cap_connect() return void {CVE-2024-36013}
• btrfs: fix incorrect splitting in btrfs_drop_extent_map_range {CVE-2023-54121}
• netfilter: nf_conntrack: defer invalid log until after unlock {CVE-2026-74624}
• NFS: Pin the 'struct nfs_server' during a FREE_STATEID call {CVE-2026-74730}
• dm cache: fix flushing uninitialized delayed_work on cache_ctr error {CVE-2024-50280}
• audit: fix recursive locking deadlock in audit_dupe_exe() {CVE-2026-68096}
• RDMA/rxe: Reject unknown opcodes before ICRC processing {CVE-2026-46133}
• Bluetooth: bnep: reject short frames before parsing {CVE-2026-53253}
• net: pull headers in qdisc_pkt_len_segs_init() {CVE-2026-53091}
• inet: RAW sockets using IPPROTO_RAW MUST drop incoming ICMP {CVE-2026-46266}
• Bluetooth: RFCOMM: validate skb length in MCC handlers {CVE-2026-53254}
• sched, cpuset: Fix dl_cpu_busy() panic due to empty cs->cpus_allowed {CVE-2022-50103}
• btrfs: qgroup: fix race between quota disable and quota rescan ioctl {CVE-2025-39759}
• fanotify: fix false positive on permission events {CVE-2026-46150}
• HID: usbhid: Eliminate recurrent out-of-bounds bug in usbhid_parse() {CVE-2025-38103}
• ext4: fix e4b bitmap inconsistency reports {CVE-2026-45942}
• Bluetooth: serialize accept_q access {CVE-2026-52918}
• ALSA: usb-audio: Add sanity check for OOB writes at silencing {CVE-2026-43279}
• RDMA/bnxt_re: zero shared page before exposing to userspace {CVE-2026-74584}
• sctp: keep chunk->transport in step with the list it is queued on {CVE-2026-74588}
• ipvs: clear IPv4 options after rebasing tunnel ICMP errors {CVE-2026-74669}
• wifi: cfg80211: Partial revert "wifi: cfg80211: Fix use after free for wext" {CVE-2023-53153}
• net/sched: cls_route: fix fastmap use-after-free on filter {CVE-2026-74583}
• nfs: use nfsi->rwsem to protect traversal of the file lock list {CVE-2026-72472}
• Bluetooth: RFCOMM: Fix session UAF in set_termios {CVE-2026-68188}
• drm/amdgpu/vce: fix integer overflow in image size {CVE-2026-68108}
• ALSA: seq: close a re-opened queue timer in the destructor {CVE-2026-68202}
• ALSA: usb-audio: fix OOB write in snd_usbmidi_akai_output() {CVE-2026-74499}
• USB: serial: io_edgeport: cap received transmit credits {CVE-2026-68365}
• net: slip: serialize receive against buffer reallocation {CVE-2026-68143}
• wifi: cfg80211: cancel sched scan results work on unregister {CVE-2026-68414}
• sctp: fix auth_hmacs array size in struct sctp_cookie {CVE-2026-68376}
• sctp: fix auth_chunk_list capacity check in sctp_auth_ep_add_chunkid {CVE-2026-68320}
• pppoe: reload header pointer after dev_hard_header() {CVE-2026-68121}
• ceph: fix pre-auth out-of-bounds read on snaptrace in ceph_handle_caps() {CVE-2026-68160}
• libceph: refresh auth->authorizer_buf{,_len} after authorizer update {CVE-2026-68156}
• libceph: remove debugfs files before client teardown {CVE-2026-68153}
• libceph: Fix multiplication overflow in decode_new_up_state_weight() {CVE-2026-68158}
• libceph: reject zero bucket types in crush_decode {CVE-2026-68154}
• libceph: bound…

This kernel update is based on upstream 5.10.33 and fixes at least the following security issues:

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket (CVE-2021-23133).

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/ verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations (CVE-2021-29155).

This update also contains the following:

• xtables-addons has been updated to 3.18 (only in Mageia 8)
• wireguard-tools has been updated to v1.0.20210424-1.mga8

For other upstream fixes, see the referenced changelogs.

This kernel-linus update is based on upstream 5.10.33 and fixes at least the following security issues:

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket (CVE-2021-23133).

An issue was discovered in the Linux kernel through 5.11.x. kernel/bpf/ verifier.c performs undesirable out-of-bounds speculation on pointer arithmetic, leading to side-channel attacks that defeat Spectre mitigations and obtain sensitive information from kernel memory. Specifically, for sequences of pointer arithmetic operations, the pointer modification performed by the first operation is not correctly accounted for when restricting subsequent operations (CVE-2021-29155).

For other upstream fixes, see the referenced changelogs.

This kernel update is based on upstream 5.10.37 and fixes at least the following security issues:

It was discovered that the io_uring implementation of the Linux kernel did not properly enforce the MAX_RW_COUNT limit in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code (CVE-2021-3491).

An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information (CVE-2021-3506).

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket. NOTE! This already had a fix in kernel-5.10.33, but that fix caused some systems to deadlock, so this is now fixed in a better way (CVE-2021-23133).

bpf: Fix propagation of 32 bit unsigned bounds from 64 bit bounds (CVE-2021-31440).

kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel (CVE-2021-31829).

net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI controller (CVE-2021-32399).

In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan. This leads to writing an arbitrary value. (CVE-2021-33034).

Other fixes in this update:

• Revert upstream iommu/vt-d fixes causing systems to hang at boot:
  • "iommu/vt-d: Preset Access/Dirty bits for IOVA over FL"
  • "iommu/vt-d: Remove WO permissions on second-level paging entries"
• Revert "irqbypass: do not start cons/prod when failed connect" as it may cause VM freeze on arm64 with GICv4
• ACPI / EC: Fix media keys not working problem on more Asus laptops
• ACPI: PM: Add ACPI ID of Alder Lake Fan
• iwlwifi: add new pci id for 6235
• usb: xhci: Add reset resume quirk for AMD xhci controller
• usb: xhci: Increase timeout for HC halt

For other upstream fixes, see the referenced changelogs.

This kernel-linus update is based on upstream 5.10.37 and fixes at least the following security issues:

It was discovered that the io_uring implementation of the Linux kernel did not properly enforce the MAX_RW_COUNT limit in some situations. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code (CVE-2021-3491).

An out-of-bounds (OOB) memory access flaw was found in fs/f2fs/node.c in the f2fs module in the Linux kernel in versions before 5.12.0-rc4. A bounds check failure allows a local attacker to gain access to out-of-bounds memory leading to a system crash or a leak of internal kernel information (CVE-2021-3506).

A race condition in Linux kernel SCTP sockets (net/sctp/socket.c) before 5.12-rc8 can lead to kernel privilege escalation from the context of a network service or an unprivileged process. If sctp_destroy_sock is called without sock_net(sk)->sctp.addr_wq_lock then an element is removed from the auto_asconf_splist list without any proper locking. This can be exploited by an attacker with network service privileges to escalate to root or from the context of an unprivileged user directly if a BPF_CGROUP_INET_SOCK_CREATE is attached which denies creation of some SCTP socket. NOTE! This already had a fix in kernel-5.10.33, but that fix caused some systems to deadlock, so this is now fixed in a better way (CVE-2021-23133).

bpf: Fix propagation of 32 bit unsigned bounds from 64 bit bounds (CVE-2021-31440).

kernel/bpf/verifier.c in the Linux kernel through 5.12.1 performs undesirable speculative loads, leading to disclosure of stack content via side-channel attacks. The specific concern is not protecting the BPF stack area against speculative loads. Also, the BPF stack can contain uninitialized data that might represent sensitive information previously operated on by the kernel (CVE-2021-31829).

net/bluetooth/hci_request.c in the Linux kernel through 5.12.2 has a race condition for removal of the HCI controller (CVE-2021-32399).

In the Linux kernel before 5.12.4, net/bluetooth/hci_event.c has a use-after-free when destroying an hci_chan. This leads to writing an arbitrary value. (CVE-2021-33034).

For other upstream fixes, see the referenced changelogs.

These are all security issues fixed in the kernel-devel-5.14.6-1.4 package on the GA media of openSUSE Tumbleweed.

These are all security issues fixed in the kernel-devel-longterm-6.6.17-1.1 package on the GA media of openSUSE Tumbleweed.

The SUSE Linux Enterprise 12 SP5 Azure kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-33200: Enforcing incorrect limits for pointer arithmetic operations by the BPF verifier could be abused to perform out-of-bounds reads and writes in kernel memory (bsc#1186484).
• CVE-2021-33034: Fixed a use-after-free when destroying an hci_chan. This could lead to writing an arbitrary values. (bsc#1186111)
• CVE-2020-26139: Fixed a denial-of-service when an Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. (bnc#1186062)
• CVE-2021-23134: A Use After Free vulnerability in nfc sockets allowed local attackers to elevate their privileges. (bnc#1186060)
• CVE-2021-3491: Fixed a potential heap overflow in mem_rw(). This vulnerability is related to the PROVIDE_BUFFERS operation, which allowed the MAX_RW_COUNT limit to be bypassed (bsc#1185642).
• CVE-2021-32399: Fixed a race condition when removing the HCI controller (bnc#1184611).
• CVE-2020-24586: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances this can be abused to inject arbitrary network packets and/or exfiltrate user data (bnc#1185859).
• CVE-2020-24587: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed (bnc#1185859 bnc#1185862).
• CVE-2020-26147: The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments, even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used (bnc#1185859).
• CVE-2020-26145: An issue was discovered with Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration. (bnc#1185860)
• CVE-2020-26141: An issue was discovered in the ALFA driver for AWUS036H, where the Message Integrity Check (authenticity) of fragmented TKIP frames was not verified. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol. (bnc#1185987)
• CVE-2021-23133: Fixed a race condition in SCTP sockets, which could lead to privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)

The following non-security bugs were fixed:

• ACPI / hotplug / PCI: Fix reference count leak in enable_slot() (git-fixes).
• ACPI: CPPC: Replace cppc_attr with kobj_attribute (git-fixes).
• ACPI: GTDT: Do not corrupt interrupt mappings on watchdow probe failure (git-fixes).
• ACPI: custom_method: fix a possible memory leak (git-fixes).
• ACPI: custom_method: fix potential use-after-free issue (git-fixes).
• ACPICA: Enable sleep button on ACPI legacy wake (bsc#1181383).
• ALSA: aloop: Fix initialization of controls (git-fixes).
• ALSA: bebob/oxfw: fix Kconfig entry for Mackie d.2 Pro (git-fixes).
• ALSA: core: remove redundant spin_lock pair in snd_card_disconnect (git-fixes).
• ALSA: emu8000: Fix a use after free in snd_emu8000_create_mixer (git-fixes).
• ALSA: hda/conexant: Re-order CX5066 quirk table entries (git-fixes).
• ALSA: hda/realtek: Re-order ALC269 Lenovo quirk table entries (git-fixes).
• ALSA:…

The SUSE Linux Enterprise 12 SP4 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-33200: Enforcing incorrect limits for pointer arithmetic operations by the BPF verifier could be abused to perform out-of-bounds reads and writes in kernel memory (bsc#1186484).
• CVE-2021-33034: Fixed a use-after-free when destroying an hci_chan. This could lead to writing an arbitrary values. (bsc#1186111)
• CVE-2020-26139: Fixed a denial-of-service when an Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. (bnc#1186062)
• CVE-2021-23134: A Use After Free vulnerability in nfc sockets allowed local attackers to elevate their privileges. (bnc#1186060)
• CVE-2021-23133: Fixed a race condition in SCTP sockets, which could lead to privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)
• CVE-2021-3491: Fixed a potential heap overflow in mem_rw(). This vulnerability is related to the PROVIDE_BUFFERS operation, which allowed the MAX_RW_COUNT limit to be bypassed (bsc#1185642).
• CVE-2021-32399: Fixed a race condition when removing the HCI controller (bnc#1184611).
• CVE-2020-24586: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances this can be abused to inject arbitrary network packets and/or exfiltrate user data (bnc#1185859).
• CVE-2020-24587: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed (bnc#1185859 bnc#1185862).
• CVE-2020-26147: The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments, even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used (bnc#1185859).
• CVE-2020-26145: An issue was discovered with Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration. (bnc#1185860)
• CVE-2020-26141: An issue was discovered in the ALFA driver for AWUS036H, where the Message Integrity Check (authenticity) of fragmented TKIP frames was not verified. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol. (bnc#1185987)

The following non-security bugs were fixed:

• Drivers: hv: vmbus: Increase wait time for VMbus unload (bsc#1185724).
• Drivers: hv: vmbus: Initialize unload_event statically (bsc#1185724).
• af_packet: fix the tx skb protocol in raw sockets with ETH_P_ALL (bsc#1176081).
• ibmvfc: Avoid move login if fast fail is enabled (bsc#1185938 ltc#192043).
• ibmvfc: Handle move login failure (bsc#1185938 ltc#192043).
• ibmvfc: Reinit target retries (bsc#1185938 ltc#192043).
• kABI: Fix kABI after modifying struct __call_single_data (bsc#1180846).
• kabi: preserve struct header_ops after bsc#1176081 fix (bsc#1176081).
• kernel/smp: Provide CSD lock timeout diagnostics (bsc#1180846).
• kernel/smp: add boot parameter for controlling CSD lock debugging (bsc#1180846).
• kernel/smp: add more data to CSD lock debugging (bsc#1180846).
• kernel/smp: make csdlock timeout depend on boot parameter (bsc#1180846).
• kernel/smp: prepare more CSD…

The SUSE Linux Enterprise 12 SP5 RT kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-33200: Enforcing incorrect limits for pointer arithmetic operations by the BPF verifier could be abused to perform out-of-bounds reads and writes in kernel memory (bsc#1186484).
• CVE-2021-33034: Fixed a use-after-free when destroying an hci_chan. This could lead to writing an arbitrary values. (bsc#1186111)
• CVE-2020-26139: Fixed a denial-of-service when an Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. (bnc#1186062)
• CVE-2021-23134: A Use After Free vulnerability in nfc sockets allowed local attackers to elevate their privileges. (bnc#1186060)
• CVE-2021-3491: Fixed a potential heap overflow in mem_rw(). This vulnerability is related to the PROVIDE_BUFFERS operation, which allowed the MAX_RW_COUNT limit to be bypassed (bsc#1185642).
• CVE-2021-32399: Fixed a race condition when removing the HCI controller (bnc#1184611).
• CVE-2020-24586: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances this can be abused to inject arbitrary network packets and/or exfiltrate user data (bnc#1185859).
• CVE-2020-24587: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed (bnc#1185859 bnc#1185862).
• CVE-2020-26147: The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments, even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used (bnc#1185859).
• CVE-2020-26145: An issue was discovered with Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration. (bnc#1185860)
• CVE-2020-26141: An issue was discovered in the ALFA driver for AWUS036H, where the Message Integrity Check (authenticity) of fragmented TKIP frames was not verified. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol. (bnc#1185987)
• CVE-2021-23133: Fixed a race condition in SCTP sockets, which could lead to privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)

The following non-security bugs were fixed:

• ACPI: CPPC: Replace cppc_attr with kobj_attribute (git-fixes).
• ACPICA: Enable sleep button on ACPI legacy wake (bsc#1181383).
• ALSA: aloop: Fix initialization of controls (git-fixes).
• ALSA: core: remove redundant spin_lock pair in snd_card_disconnect (git-fixes).
• ALSA: usb-audio: Add error checks for usb_driver_claim_interface() calls (git-fixes).
• ALSA: usb: midi: do not return -ENOMEM when usb_urb_ep_type_check fails (git-fixes).
• ARM: footbridge: fix PCI interrupt mapping (git-fixes).
• ASoC: fsl_esai: Fix TDM slot setup for I2S mode (git-fixes).
• ASoC: intel: atom: Stop advertising non working S24LE support (git-fixes).
• ASoC: wm8960: Fix wrong bclk and lrclk with pll enabled for some chips (git-fixes).
• Avoid potentially erroneos RST drop (bsc#1183947).
• Do not drop out of segments RST if tcp_be_liberal is set (bsc#1183947).
• Drivers: hv: vmbus: Increase…

The SUSE Linux Enterprise 15 SP1 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-33200: Enforcing incorrect limits for pointer arithmetic operations by the BPF verifier could be abused to perform out-of-bounds reads and writes in kernel memory (bsc#1186484).
• CVE-2021-33034: Fixed a use-after-free when destroying an hci_chan. This could lead to writing an arbitrary values. (bsc#1186111)
• CVE-2020-26139: Fixed a denial-of-service when an Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. (bnc#1186062)
• CVE-2021-23134: A Use After Free vulnerability in nfc sockets allowed local attackers to elevate their privileges. (bnc#1186060)
• CVE-2021-23133: Fixed a race condition in SCTP sockets, which could lead to privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)
• CVE-2021-3491: Fixed a potential heap overflow in mem_rw(). This vulnerability is related to the PROVIDE_BUFFERS operation, which allowed the MAX_RW_COUNT limit to be bypassed (bsc#1185642).
• CVE-2021-32399: Fixed a race condition when removing the HCI controller (bnc#1184611).
• CVE-2020-24586: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances this can be abused to inject arbitrary network packets and/or exfiltrate user data (bnc#1185859).
• CVE-2020-24587: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed (bnc#1185859 bnc#1185862).
• CVE-2020-26147: The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments, even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used (bnc#1185859).
• CVE-2020-26145: An issue was discovered with Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration. (bnc#1185860)
• CVE-2020-26141: An issue was discovered in the ALFA driver for AWUS036H, where the Message Integrity Check (authenticity) of fragmented TKIP frames was not verified. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol. (bnc#1185987)

The following non-security bugs were fixed:

• Drivers: hv: vmbus: Increase wait time for VMbus unload (bsc#1185725).
• Drivers: hv: vmbus: Initialize unload_event statically (bsc#1185725).
• dm: fix redundant IO accounting for bios that need splitting (bsc#1183738).
• ibmvfc: Avoid move login if fast fail is enabled (bsc#1185938 ltc#192043).
• ibmvfc: Handle move login failure (bsc#1185938 ltc#192043).
• ibmvfc: Reinit target retries (bsc#1185938 ltc#192043).
• kabi: Fix breakage in NVMe driver (bsc#1181161).
• kabi: Fix nvmet error log definitions (bsc#1181161).
• kabi: nvme: fix fast_io_fail_tmo (bsc#1181161).
• md/raid1: properly indicate failure when ending a failed write request (bsc#1185680).
• net: sched: disable TCQ_F_NOLOCK for pfifo_fast (bsc#1183405)
• netfilter: conntrack: add new sysctl to disable RST check (bsc#1183947 bsc#1185950).
• netfilter: conntrack: avoid misleading 'invalid' in log message…

The SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-33200: Enforcing incorrect limits for pointer arithmetic operations by the BPF verifier could be abused to perform out-of-bounds reads and writes in kernel memory (bsc#1186484).
• CVE-2021-33034: Fixed a use-after-free when destroying an hci_chan. This could lead to writing an arbitrary values. (bsc#1186111)
• CVE-2020-26139: Fixed a denial-of-service when an Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. (bnc#1186062)
• CVE-2021-23134: A Use After Free vulnerability in nfc sockets allowed local attackers to elevate their privileges. (bnc#1186060)
• CVE-2021-3491: Fixed a potential heap overflow in mem_rw(). This vulnerability is related to the PROVIDE_BUFFERS operation, which allowed the MAX_RW_COUNT limit to be bypassed (bsc#1185642).
• CVE-2021-32399: Fixed a race condition when removing the HCI controller (bnc#1184611).
• CVE-2020-24586: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that received fragments be cleared from memory after (re)connecting to a network. Under the right circumstances this can be abused to inject arbitrary network packets and/or exfiltrate user data (bnc#1185859).
• CVE-2020-24587: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that all fragments of a frame are encrypted under the same key. An adversary can abuse this to decrypt selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP encryption key is periodically renewed (bnc#1185859 bnc#1185862).
• CVE-2020-26147: The WEP, WPA, WPA2, and WPA3 implementations reassemble fragments, even though some of them were sent in plaintext. This vulnerability can be abused to inject packets and/or exfiltrate selected fragments when another device sends fragmented frames and the WEP, CCMP, or GCMP data-confidentiality protocol is used (bnc#1185859).
• CVE-2020-26145: An issue was discovered with Samsung Galaxy S3 i9305 4.4.4 devices. The WEP, WPA, WPA2, and WPA3 implementations accept second (or subsequent) broadcast fragments even when sent in plaintext and process them as full unfragmented frames. An adversary can abuse this to inject arbitrary network packets independent of the network configuration. (bnc#1185860)
• CVE-2020-26141: An issue was discovered in the ALFA driver for AWUS036H, where the Message Integrity Check (authenticity) of fragmented TKIP frames was not verified. An adversary can abuse this to inject and possibly decrypt packets in WPA or WPA2 networks that support the TKIP data-confidentiality protocol. (bnc#1185987)
• CVE-2021-23133: Fixed a race condition in SCTP sockets, which could lead to privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)

The following non-security bugs were fixed:

• ACPI / hotplug / PCI: Fix reference count leak in enable_slot() (git-fixes).
• ACPI: CPPC: Replace cppc_attr with kobj_attribute (git-fixes).
• ACPI: GTDT: Do not corrupt interrupt mappings on watchdow probe failure (git-fixes).
• ACPI: custom_method: fix a possible memory leak (git-fixes).
• ACPI: custom_method: fix potential use-after-free issue (git-fixes).
• ACPICA: Enable sleep button on ACPI legacy wake (bsc#1181383).
• ALSA: aloop: Fix initialization of controls (git-fixes).
• ALSA: bebob/oxfw: fix Kconfig entry for Mackie d.2 Pro (git-fixes).
• ALSA: core: remove redundant spin_lock pair in snd_card_disconnect (git-fixes).
• ALSA: emu8000: Fix a use after free in snd_emu8000_create_mixer (git-fixes).
• ALSA: hda/conexant: Re-order CX5066 quirk table entries (git-fixes).
• ALSA: hda/realtek: Re-order ALC269 Lenovo quirk table entries (git-fixes).
• ALSA: hda/realtek:…

This update for the Linux Kernel 4.12.14-197_56 fixes several issues.

The following security issues were fixed:

• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 4.12.14-197_48 fixes several issues.

The following security issues were fixed:

• CVE-2021-0605: Fixed an out-of-bounds read which could lead to local information disclosure in the kernel with System execution privileges needed. (bsc#1187687)
• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-24_49 fixes several issues.

The following security issues were fixed:

• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-24_61 fixes one issue.

The following security issue was fixed:

• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 4.12.14-150_72 fixes several issues.

The following security issues were fixed:

• CVE-2021-0605: Fixed an out-of-bounds read which could lead to local information disclosure in the kernel with System execution privileges needed. (bsc#1187687)
• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-24_9 fixes several issues.

The following security issues were fixed:

• CVE-2021-0605: Fixed an out-of-bounds read which could lead to local information disclosure in the kernel with System execution privileges needed. (bsc#1187687)
• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-57 fixes one issue.

The following security issue was fixed:

• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-24_29 fixes several issues.

The following security issues were fixed:

• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

The SUSE Linux Enterprise 15 LTSS kernel was updated to receive various security and bugfixes.

The following security bugs were fixed:

• CVE-2021-22555: A heap out-of-bounds write was discovered in net/netfilter/x_tables.c (bnc#1188116 ).
• CVE-2021-33909: Extremely large seq buffer allocations in seq_file could lead to buffer underruns and code execution (bsc#1188062).
• CVE-2021-3609: A use-after-free in can/bcm could have led to privilege escalation (bsc#1187215).
• CVE-2021-33624: In kernel/bpf/verifier.c a branch can be mispredicted (e.g., because of type confusion) and consequently an unprivileged BPF program can read arbitrary memory locations via a side-channel attack, aka CID-9183671af6db (bnc#1187554).
• CVE-2021-0605: In pfkey_dump of af_key.c, there is a possible out-of-bounds read due to a missing bounds check. This could lead to local information disclosure with System execution privileges needed. User interaction is not needed for exploitation (bnc#1187601).
• CVE-2021-0512: In __hidinput_change_resolution_multipliers of hid-input.c, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation (bnc#1187595).
• CVE-2020-26558: Bluetooth LE and BR/EDR secure pairing in Bluetooth Core Specification 2.1 may permit a nearby man-in-the-middle attacker to identify the Passkey used during pairing (in the Passkey authentication procedure) by reflection of the public key and the authentication evidence of the initiating device, potentially permitting this attacker to complete authenticated pairing with the responding device using the correct Passkey for the pairing session. The attack methodology determines the Passkey value one bit at a time (bnc#1179610).
• CVE-2021-34693: net/can/bcm.c in the Linux kernel allowed local users to obtain sensitive information from kernel stack memory because parts of a data structure are uninitialized (bnc#1187452).
• CVE-2020-36385: An issue was discovered in the Linux kernel drivers/infiniband/core/ucma.c has a use-after-free because the ctx is reached via the ctx_list in some ucma_migrate_id situations where ucma_close is called, aka CID-f5449e74802c (bnc#1187050).
• CVE-2021-0129: Improper access control in BlueZ may have allowed an authenticated user to potentially enable information disclosure via adjacent access (bnc#1186463).
• CVE-2020-36386: An issue was discovered in the Linux kernel net/bluetooth/hci_event.c has a slab out-of-bounds read in hci_extended_inquiry_result_evt, aka CID-51c19bf3d5cf (bnc#1187038).
• CVE-2020-24588: The 802.11 standard that underpins Wi-Fi Protected Access (WPA, WPA2, and WPA3) and Wired Equivalent Privacy (WEP) doesn't require that the A-MSDU flag in the plaintext QoS header field is authenticated. Against devices that support receiving non-SSP A-MSDU frames (which is mandatory as part of 802.11n), an adversary can abuse this to inject arbitrary network packets (bnc#1185861).
• CVE-2021-33200: kernel/bpf/verifier.c enforced incorrect limits for pointer arithmetic operations, aka CID-bb01a1bba579. This can be abused to perform out-of-bounds reads and writes in kernel memory, leading to local privilege escalation to root. In particular, there is a corner case where the off reg causes a masking direction change, which then results in an incorrect final aux->alu_limit (bnc#1186484).
• CVE-2021-33034: net/bluetooth/hci_event.c had a use-after-free when destroying an hci_chan, aka CID-5c4c8c954409. This leads to writing an arbitrary value (bnc#1186111).
• CVE-2020-26139: An Access Point (AP) forwards EAPOL frames to other clients even though the sender has not yet successfully authenticated to the AP. This might be abused in projected Wi-Fi networks to launch denial-of-service attacks against connected clients and made it easier to exploit other vulnerabilities in connected clients (bnc#1186062).…

This update for the Linux Kernel 4.12.14-122_51 fixes several issues.

The following security issues were fixed:

• CVE-2021-0512: Fixed a possible out-of-bounds write which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1187597)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 4.12.14-122_66 fixes one issue.

The following security issue was fixed:

• CVE-2021-23133: Fixed a race condition in the SCTP sockets that can lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bsc#1185901)

This update for the Linux Kernel 5.3.18-24_53_4 fixes several issues.

The following security issues were fixed:

• CVE-2021-33909: Fixed an out-of-bounds write in the filesystem layer that allows to andobtain full root privileges. (bsc#1188062)
• CVE-2021-22555: Fixed an heap out-of-bounds write in net/netfilter/x_tables.c that could allow local provilege escalation. (bsc#1188116)
• CVE-2020-36385: Fixed a use-after-free vulnerability reached via the ctx_list in some ucma_migrate_id situations where ucma_close is called. (bnc#1187050)
• CVE-2021-23133: Fixed a race condition in the SCTP sockets that could lead to kernel privilege escalation from the context of a network service or an unprivileged process. (bnc#1184675)
• CVE-2021-33034: Fixed a use-after-free vulnerability when destroying an hci_chan which leads to writing an arbitrary value. (bnc#1186111)
• CVE-2021-32399: Fixed a race condition in net/bluetooth/hci_request.c for removal of the HCI controller. (bsc#1184611)
• CVE-2020-36322: Fixed an issue in the FUSE filesystem implementation. This bug was addressed with a previous fix, which turned out was incomplete, and its incompleteness is tracked as CVE-2021-28950. (bsc#1184211)
• CVE-2021-29154: Fixed an incorrect computation of branch displacements in the BPF JIT compilers, which could allow to execute arbitrary code within the kernel context. (bsc#1184391)
• CVE-2021-3444: The bpf verifier did not properly handle mod32 destination register truncation when the source register was known to be 0. A local attacker with the ability to load bpf programs could use this gain out-of-bounds reads in kernel memory leading to information disclosure (kernel memory), and possibly out-of-bounds writes that could potentially lead to code execution. (bsc#1184170)
• CVE-2021-28660: Fixed an out-of-bounds write in rtw_wx_set_scan which could lead to local escalation of privilege with no additional execution privileges needed. (bsc#1183593)
• CVE-2021-27365: Fixed an issue in certain iSCSI data structures that do not have appropriate length constraints or checks, and can exceed the PAGE_SIZE value. (bsc#1182715)
• CVE-2021-28688: Fixed some uninitialization pointers in Xen that could result in leaking persistent grants. The leak in turn would prevent fully cleaning up after a respective guest has died, leaving around zombie domains. (bsc#1183646)
• CVE-2021-27363: Fixed a kernel pointer leak that can be used to determine the address of the iscsi_transport structure. (bsc#1182716)
• CVE-2021-27364: Fixed an issue that provides an unprivileged user the ability of craft Netlink messages. (bsc#1182717)

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel contained a reference counting error. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25670)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly deallocate memory in certain error situations. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2020-25671, CVE-2020-25672)

Kiyin (尹亮) discovered that the NFC LLCP protocol implementation in the Linux kernel did not properly handle error conditions in some situations, leading to an infinite loop. A local attacker could use this to cause a denial of service. (CVE-2020-25673)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could reassemble mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147)

Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

Piotr Krysiuk and Benedict Schlueter discovered that the eBPF implementation in the Linux kernel performed out of bounds speculation on pointer arithmetic. A local attacker could use this to expose sensitive information. (CVE-2021-29155)

Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code. (CVE-2021-31440)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could reassemble mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147)

Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23134)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)

It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)

It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)

It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)

USN-5000-1 fixed vulnerabilities in the Linux kernel for Ubuntu 20.04 LTS and the Linux HWE kernel for Ubuntu 18.04 LTS. This update provides the corresponding updates for the Linux KVM kernel for Ubuntu 20.04 LTS.

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly enforce limits for pointer operations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33200)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could reassemble mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147)

Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23134)

Piotr Krysiuk discovered that the eBPF implementation in the Linux kernel did not properly prevent speculative loads in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2021-31829)

It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)

It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)

It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly clear received fragments from memory in some situations. A physically proximate attacker could possibly use this issue to inject packets or expose sensitive information. (CVE-2020-24586)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled encrypted fragments. A physically proximate attacker could possibly use this issue to decrypt fragments. (CVE-2020-24587)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled certain malformed frames. If a user were tricked into connecting to a malicious server, a physically proximate attacker could use this issue to inject packets. (CVE-2020-24588)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation incorrectly handled EAPOL frames from unauthenticated senders. A physically proximate attacker could inject malicious packets to cause a denial of service (system crash). (CVE-2020-26139)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation did not properly verify certain fragmented frames. A physically proximate attacker could possibly use this issue to inject or decrypt packets. (CVE-2020-26141)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation accepted plaintext fragments in certain situations. A physically proximate attacker could use this issue to inject packets. (CVE-2020-26145)

Mathy Vanhoef discovered that the Linux kernel’s WiFi implementation could reassemble mixed encrypted and plaintext fragments. A physically proximate attacker could possibly use this issue to inject packets or exfiltrate selected fragments. (CVE-2020-26147)

Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)

Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23134)

Manfred Paul discovered that the extended Berkeley Packet Filter (eBPF) implementation in the Linux kernel contained an out-of-bounds vulnerability. A local attacker could use this issue to execute arbitrary code. (CVE-2021-31440)

It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)

It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)

It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)

Mathias Krause discovered that a null pointer dereference existed in the Nitro Enclaves kernel driver of the Linux kernel. A local attacker could use this issue to cause a denial of service or possibly execute arbitrary code. (CVE-2021-3543)

Norbert Slusarek discovered a race condition in the CAN BCM networking protocol of the Linux kernel leading to multiple use-after-free vulnerabilities. A local attacker could use this issue to execute arbitrary code. (CVE-2021-3609)

It was discovered that the eBPF implementation in the Linux kernel did not properly track bounds information for 32 bit registers when performing div and mod operations. A local attacker could use this to possibly execute arbitrary code. (CVE-2021-3600)

Or Cohen discovered that the SCTP implementation in the Linux kernel contained a race condition in some situations, leading to a use-after-free condition. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23133)