CVE-2021-3773

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

• kernel: avoid cyclic entity chains due to malformed USB descriptors (CVE-2020-0404)

• kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c (CVE-2020-13974)

• kernel: out-of-bounds read in bpf_skb_change_head() of filter.c due to a use-after-free (CVE-2021-0941)

• kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP() (CVE-2021-3612)

• kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts (CVE-2021-3669)

• kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c (CVE-2021-3743)

• kernel: crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd() (CVE-2021-3744)

• kernel: possible use-after-free in bluetooth module (CVE-2021-3752)

• kernel: unaccounted ipc objects in Linux kernel lead to breaking memcg limits and DoS attacks (CVE-2021-3759)

• kernel: DoS in ccp_run_aes_gcm_cmd() function (CVE-2021-3764)

• kernel: sctp: Invalid chunks may be used to remotely remove existing associations (CVE-2021-3772)

• kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients (CVE-2021-3773)

• kernel: possible leak or coruption of data residing on hugetlbfs (CVE-2021-4002)

• kernel: security regression for CVE-2018-13405 (CVE-2021-4037)

• kernel: Buffer overwrite in decode_nfs_fh function (CVE-2021-4157)

• kernel: cgroup: Use open-time creds and namespace for migration perm checks (CVE-2021-4197)

• kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses (CVE-2021-4203)

• kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (CVE-2021-20322)

• hw: cpu: LFENCE/JMP Mitigation Update for CVE-2017-5715 (CVE-2021-26401)

• kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)

• kernel: use-after-free in hso_free_net_device() in drivers/net/usb/hso.c (CVE-2021-37159)

• kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write (CVE-2021-41864)

• kernel: Heap buffer overflow in firedtv driver (CVE-2021-42739)

• kernel: an array-index-out-bounds in detach_capi_ctr in drivers/isdn/capi/kcapi.c (CVE-2021-43389)

• kernel: mwifiex_usb_recv() in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker to cause DoS via crafted USB device (CVE-2021-43976)

• kernel: use-after-free in the TEE subsystem (CVE-2021-44733)

• kernel: information leak in the IPv6 implementation (CVE-2021-45485)

• kernel: information leak in the IPv4 implementation (CVE-2021-45486)

• hw: cpu: intel: Branch History Injection (BHI) (CVE-2022-0001)

• hw: cpu: intel: Intra-Mode BTI (CVE-2022-0002)

• kernel: Local denial of service in bond_ipsec_add_sa (CVE-2022-0286)

• kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c (CVE-2022-0322)

• kernel: FUSE allows UAF reads of write() buffers, allowing theft of (partial) /etc/shadow hashes (CVE-2022-1011)

• kernel: use-after-free in nouveau kernel module (CVE-2020-27820)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.6 Release Notes linked from the References section.

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

Security Fix(es):

• kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

• kernel: avoid cyclic entity chains due to malformed USB descriptors (CVE-2020-0404)

• kernel: speculation on incompletely validated data on IBM Power9 (CVE-2020-4788)

• kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c (CVE-2020-13974)

• kernel: out-of-bounds read in bpf_skb_change_head() of filter.c due to a use-after-free (CVE-2021-0941)

• kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP() (CVE-2021-3612)

• kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts (CVE-2021-3669)

• kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c (CVE-2021-3743)

• kernel: crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd() (CVE-2021-3744)

• kernel: possible use-after-free in bluetooth module (CVE-2021-3752)

• kernel: unaccounted ipc objects in Linux kernel lead to breaking memcg limits and DoS attacks (CVE-2021-3759)

• kernel: DoS in ccp_run_aes_gcm_cmd() function (CVE-2021-3764)

• kernel: sctp: Invalid chunks may be used to remotely remove existing associations (CVE-2021-3772)

• kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients (CVE-2021-3773)

• kernel: possible leak or coruption of data residing on hugetlbfs (CVE-2021-4002)

• kernel: security regression for CVE-2018-13405 (CVE-2021-4037)

• kernel: Buffer overwrite in decode_nfs_fh function (CVE-2021-4157)

• kernel: cgroup: Use open-time creds and namespace for migration perm checks (CVE-2021-4197)

• kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses (CVE-2021-4203)

• kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (CVE-2021-20322)

• kernel: arm: SIGPAGE information disclosure vulnerability (CVE-2021-21781)

• hw: cpu: LFENCE/JMP Mitigation Update for CVE-2017-5715 (CVE-2021-26401)

• kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)

• kernel: use-after-free in hso_free_net_device() in drivers/net/usb/hso.c (CVE-2021-37159)

• kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write (CVE-2021-41864)

• kernel: Heap buffer overflow in firedtv driver (CVE-2021-42739)

• kernel: ppc: kvm: allows a malicious KVM guest to crash the host (CVE-2021-43056)

• kernel: an array-index-out-bounds in detach_capi_ctr in drivers/isdn/capi/kcapi.c (CVE-2021-43389)

• kernel: mwifiex_usb_recv() in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker to cause DoS via crafted USB device (CVE-2021-43976)

• kernel: use-after-free in the TEE subsystem (CVE-2021-44733)

• kernel: information leak in the IPv6 implementation (CVE-2021-45485)

• kernel: information leak in the IPv4 implementation (CVE-2021-45486)

• hw: cpu: intel: Branch History Injection (BHI) (CVE-2022-0001)

• hw: cpu: intel: Intra-Mode BTI (CVE-2022-0002)

• kernel: Local denial of service in bond_ipsec_add_sa (CVE-2022-0286)

• kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c (CVE-2022-0322)

• kernel: FUSE allows UAF reads of write() buffers, allowing theft of (partial) /etc/shadow hashes (CVE-2022-1011)

• kernel: use-after-free in nouveau kernel module (CVE-2020-27820)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the Rocky Linux 8.6 Release Notes linked from the References section.

A flaw in netfilter could allow a network-connected attacker to infer openvpn connection endpoint information for further use in traditional network attacks.

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

Security Fix(es):

• kernel: fget: check that the fd still exists after getting a ref to it (CVE-2021-4083)

• kernel: avoid cyclic entity chains due to malformed USB descriptors (CVE-2020-0404)

• kernel: speculation on incompletely validated data on IBM Power9 (CVE-2020-4788)

• kernel: integer overflow in k_ascii() in drivers/tty/vt/keyboard.c (CVE-2020-13974)

• kernel: out-of-bounds read in bpf_skb_change_head() of filter.c due to a use-after-free (CVE-2021-0941)

• kernel: joydev: zero size passed to joydev_handle_JSIOCSBTNMAP() (CVE-2021-3612)

• kernel: reading /proc/sysvipc/shm does not scale with large shared memory segment counts (CVE-2021-3669)

• kernel: out-of-bound Read in qrtr_endpoint_post in net/qrtr/qrtr.c (CVE-2021-3743)

• kernel: crypto: ccp - fix resource leaks in ccp_run_aes_gcm_cmd() (CVE-2021-3744)

• kernel: possible use-after-free in bluetooth module (CVE-2021-3752)

• kernel: unaccounted ipc objects in Linux kernel lead to breaking memcg limits and DoS attacks (CVE-2021-3759)

• kernel: DoS in ccp_run_aes_gcm_cmd() function (CVE-2021-3764)

• kernel: sctp: Invalid chunks may be used to remotely remove existing associations (CVE-2021-3772)

• kernel: lack of port sanity checking in natd and netfilter leads to exploit of OpenVPN clients (CVE-2021-3773)

• kernel: possible leak or coruption of data residing on hugetlbfs (CVE-2021-4002)

• kernel: security regression for CVE-2018-13405 (CVE-2021-4037)

• kernel: Buffer overwrite in decode_nfs_fh function (CVE-2021-4157)

• kernel: cgroup: Use open-time creds and namespace for migration perm checks (CVE-2021-4197)

• kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses (CVE-2021-4203)

• kernel: new DNS Cache Poisoning Attack based on ICMP fragment needed packets replies (CVE-2021-20322)

• kernel: arm: SIGPAGE information disclosure vulnerability (CVE-2021-21781)

• hw: cpu: LFENCE/JMP Mitigation Update for CVE-2017-5715 (CVE-2021-26401)

• kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)

• kernel: use-after-free in hso_free_net_device() in drivers/net/usb/hso.c (CVE-2021-37159)

• kernel: eBPF multiplication integer overflow in prealloc_elems_and_freelist() in kernel/bpf/stackmap.c leads to out-of-bounds write (CVE-2021-41864)

• kernel: Heap buffer overflow in firedtv driver (CVE-2021-42739)

• kernel: ppc: kvm: allows a malicious KVM guest to crash the host (CVE-2021-43056)

• kernel: an array-index-out-bounds in detach_capi_ctr in drivers/isdn/capi/kcapi.c (CVE-2021-43389)

• kernel: mwifiex_usb_recv() in drivers/net/wireless/marvell/mwifiex/usb.c allows an attacker to cause DoS via crafted USB device (CVE-2021-43976)

• kernel: use-after-free in the TEE subsystem (CVE-2021-44733)

• kernel: information leak in the IPv6 implementation (CVE-2021-45485)

• kernel: information leak in the IPv4 implementation (CVE-2021-45486)

• hw: cpu: intel: Branch History Injection (BHI) (CVE-2022-0001)

• hw: cpu: intel: Intra-Mode BTI (CVE-2022-0002)

• kernel: Local denial of service in bond_ipsec_add_sa (CVE-2022-0286)

• kernel: DoS in sctp_addto_chunk in net/sctp/sm_make_chunk.c (CVE-2022-0322)

• kernel: FUSE allows UAF reads of write() buffers, allowing theft of (partial) /etc/shadow hashes (CVE-2022-1011)

• kernel: use-after-free in nouveau kernel module (CVE-2020-27820)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Additional Changes:

For detailed information on changes in this release, see the AlmaLinux Release Notes linked from the References section.

• ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr {CVE-2025-68183}
• futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock {CVE-2026-53166}
• rtmutex: Use waiter::task instead of current in remove_waiter() {CVE-2026-43499}
• net: bonding: fix use-after-free in bond_xmit_broadcast() {CVE-2026-31419}
• Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold {CVE-2026-31408}
• mptcp: fix slab-use-after-free in __inet_lookup_established {CVE-2026-31669}
• svcrdma: bound check rq_pages index in inline path {CVE-2025-71068}
• ALSA: scarlett2: Fix buffer overflow in config retrieval {CVE-2026-23078}
• cpufreq: governor: fix double free in cpufreq_dbs_governor_init() error path {CVE-2026-43328}
• drm/amd/display: Do not skip unrelated mode changes in DSC validation {CVE-2026-31488}
• HID: wacom: fix out-of-bounds read in wacom_intuos_bt_irq {CVE-2026-43051}
• net: usb: cdc_ncm: add ndpoffset to NDP16 nframes bounds check {CVE-2026-23448}
• bpf, sockmap: Fix race between element replace and close() {CVE-2024-56664}
• mm: blk-cgroup: fix use-after-free in cgwb_release_workfn() {CVE-2026-31586}
• crypto: pcrypt - Fix handling of MAY_BACKLOG requests {CVE-2026-43493}
• atm: lec: fix use-after-free in sock_def_readable() {CVE-2026-43050}
• driver core: enforce device_lock for driver_match_device() {CVE-2026-31688}
• driver core: platform: use generic driver_override infrastructure {CVE-2026-31527}
• nfsd: fix heap overflow in NFSv4.0 LOCK replay cache {CVE-2026-31402}
• ext4: convert inline data to extents when truncate exceeds inline size {CVE-2026-31452}
• usb: class: cdc-wdm: fix reordering issue in read code path {CVE-2026-43427}
• xen/privcmd: fix double free via VMA splitting {CVE-2026-31787}
• netfilter: nf_tables: release flowtable after rcu grace period on error {CVE-2026-23392}
• wifi: mac80211: check tdls flag in ieee80211_tdls_oper {CVE-2026-43052}
• netfilter: conntrack: switch to siphash {CVE-2021-3773}
• gpiolib: cdev: fix NULL-pointer dereferences {CVE-2022-50453}
• tracing: Free buffers when a used dynamic event is removed {CVE-2022-49006}
• dlm: validate length in dlm_search_rsb_tree {CVE-2026-43125}
• Bluetooth: btintel: serialize btintel_hw_error() with hci_req_sync_lock {CVE-2026-31500}
• tpm: fix reference counting for struct tpm_chip {CVE-2022-2977}
• tracing: Fix wild-memory-access in register_synth_event() {CVE-2022-49799}
• nfnetlink_osf: validate individual option lengths in fingerprints {CVE-2026-23397}
• ext4: block range must be validated before use in ext4_mb_clear_bb() {CVE-2022-50021}
• netfilter: flowtable: strictly check for maximum number of actions {CVE-2026-43329}
• crypto: lzo - Fix compression buffer overrun {CVE-2025-38068}
• xen: fix buffer overflow in buildid_show() {CVE-2026-31786}
• NTB: fix possible name leak in ntb_register_device() {CVE-2023-52652}
• ALSA: ctxfi: Fix potential OOB access in audio mixer handling {CVE-2026-23076}
• erspan: do not use skb_mac_header() in ndo_start_xmit() {CVE-2023-53053}
• net: af_key: zero aligned sockaddr tail in PF_KEY exports {CVE-2026-43088}
• ata: libata-transport: fix double ata_host_put() in ata_tport_add() {CVE-2022-49826}

Root has patched CVE-2021-3773 in the linux package for Root:Ubuntu:22.04. Multiple fixed versions available.