CVE-2025-21837

In the Linux kernel, the following vulnerability has been resolved:

io_uring/uring_cmd: unconditionally copy SQEs at prep time

This isn't generally necessary, but conditions have been observed where SQE data is accessed from the original SQE after prep has been done and outside of the initial issue. Opcode prep handlers must ensure that any SQE related data is stable beyond the prep phase, but uring_cmd is a bit special in how it handles the SQE which makes it susceptible to reading stale data. If the application has reused the SQE before the original completes, then that can lead to data corruption.

Down the line we can relax this again once uring_cmd has been sanitized a bit, and avoid unnecessarily copying the SQE.

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

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

Security Fix(es):

• kernel: xen: Xen hypercall page unsafe against speculative attacks (Xen Security Advisory 466) (CVE-2024-53241)
• kernel: exfat: fix out-of-bounds access of directory entries (CVE-2024-53147)
• kernel: zram: fix NULL pointer in comp_algorithm_show() (CVE-2024-53222)
• kernel: nfsd: release svc_expkey/svc_export with rcu_work (CVE-2024-53216)
• kernel: acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl (CVE-2024-56662)
• kernel: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors (CVE-2024-56675)
• kernel: crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY (CVE-2024-56690)
• kernel: igb: Fix potential invalid memory access in igb_init_module() (CVE-2024-52332)
• kernel: af_packet: fix vlan_get_protocol_dgram() vs MSG_PEEK (CVE-2024-57901)
• kernel: af_packet: fix vlan_get_tci() vs MSG_PEEK (CVE-2024-57902)
• kernel: io_uring/sqpoll: zero sqd->thread on tctx errors (CVE-2025-21633)
• kernel: ipvlan: Fix use-after-free in ipvlan_get_iflink(). (CVE-2025-21652)
• kernel: sched: sch_cake: add bounds checks to host bulk flow fairness counts (CVE-2025-21647)
• kernel: io_uring/eventfd: ensure io_eventfd_signal() defers another RCU period (CVE-2025-21655)
• kernel: netfs: Fix the (non-)cancellation of copy when cache is temporarily disabled (CVE-2024-57941)
• kernel: netfs: Fix ceph copy to cache on write-begin (CVE-2024-57942)
• kernel: zram: fix potential UAF of zram table (CVE-2025-21671)
• kernel: pktgen: Avoid out-of-bounds access in get_imix_entries (CVE-2025-21680)
• kernel: mm: zswap: properly synchronize freeing resources during CPU hotunplug (CVE-2025-21693)
• kernel: cachestat: fix page cache statistics permission checking (CVE-2025-21691)
• kernel: mm: clear uffd-wp PTE/PMD state on mremap() (CVE-2025-21696)
• kernel: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 (CVE-2025-21702)
• kernel: RDMA/mlx5: Fix a race for an ODP MR which leads to CQE with error (CVE-2025-21732)
• kernel: NFSD: fix hang in nfsd4_shutdown_callback (CVE-2025-21795)
• kernel: NFS: Fix potential buffer overflowin nfs_sysfs_link_rpc_client() (CVE-2024-54456)
• kernel: Bluetooth: btrtl: check for NULL in btrtl_setup_realtek() (CVE-2024-57987)
• kernel: wifi: brcmsmac: add gain range check to wlc_phy_iqcal_gainparams_nphy() (CVE-2024-58014)
• kernel: Bluetooth: btbcm: Fix NULL deref in btbcm_get_board_name() (CVE-2024-57988)
• kernel: drm/xe/tracing: Fix a potential TP_printk UAF (CVE-2024-49570)
• kernel: media: intel/ipu6: remove cpu latency qos request on error (CVE-2024-58004)
• kernel: usbnet: ipheth: use static NDP16 location in URB (CVE-2025-21742)
• kernel: usbnet: ipheth: fix possible overflow in DPE length check (CVE-2025-21743)
• kernel: wifi: mt76: mt7925: fix NULL deref check in mt7925_change_vif_links (CVE-2024-57989)
• kernel: wifi: ath12k: Fix for out-of bound access error (CVE-2024-58015)
• kernel: wifi: ath12k: fix read pointer after free in ath12k_mac_assign_vif_to_vdev() (CVE-2024-57995)
• kernel: nfsd: clear acl_access/acl_default after releasing them (CVE-2025-21796)
• kernel: workqueue: Put the pwq after detaching the rescuer from the pool (CVE-2025-21786)
• kernel: tpm: Change to kvalloc() in eventlog/acpi.c (CVE-2024-58005)
• kernel: Bluetooth: MGMT: Fix slab-use-after-free Read in mgmt_remove_adv_monitor_sync (CVE-2024-58013)
• kernel: ring-buffer: Validate the persistent meta data subbuf array (CVE-2025-21777)
• kernel: ata: libata-sff: Ensure that we cannot write outside the allocated buffer (CVE-2025-21738)
• kernel: HID: core: Fix assumption that Resolution Multipliers must be in Logical Collections (CVE-2024-57986)
• kernel: padata: avoid UAF for reorder_work (CVE-2025-21726)
• kernel: vrf: use RCU protection in l3mdev_l3_out() (CVE-2025-21791)
• kernel: HID:…

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

Security Fix(es):

• kernel: can: isotp: fix potential CAN frame reception race in isotp_rcv() (CVE-2022-48830)
• kernel: soc: qcom: cmd-db: Map shared memory as WC, not WB (CVE-2024-46689)
• kernel: Squashfs: sanity check symbolic link size (CVE-2024-46744)
• kernel: vfs: fix race between evice_inodes() and find_inode()&iput() (CVE-2024-47679)
• kernel: x86/tdx: Fix "in-kernel MMIO" check (CVE-2024-47727)
• kernel: rxrpc: Fix a race between socket set up and I/O thread creation (CVE-2024-49864)
• kernel: io_uring: check if we need to reschedule during overflow flush (CVE-2024-50060)
• kernel: can: m_can: pci: add missing m_can_class_free_dev() in probe/remove methods (CVE-2022-49024)
• kernel: posix-clock: Fix missing timespec64 check in pc_clock_settime() (CVE-2024-50195)
• kernel: rxrpc: Fix missing locking causing hanging calls (CVE-2024-50294)
• kernel: io_uring/rw: fix missing NOWAIT check for O_DIRECT start write (CVE-2024-53052)
• kernel: afs: Fix lock recursion (CVE-2024-53090)
• kernel: virtio/vsock: Fix accept_queue memory leak (CVE-2024-53119)
• kernel: KVM: VMX: Bury Intel PT virtualization (guest/host mode) behind CONFIG_BROKEN (CVE-2024-53135)
• kernel: xen: Xen hypercall page unsafe against speculative attacks (Xen Security Advisory 466) (CVE-2024-53241)
• kernel: RDMA/rxe: Fix the qp flush warnings in req (CVE-2024-53229)
• kernel: block: fix uaf for flush rq while iterating tags (CVE-2024-53170)
• kernel: nfsd: release svc_expkey/svc_export with rcu_work (CVE-2024-53216)
• kernel: net: af_can: do not leave a dangling sk pointer in can_create() (CVE-2024-56603)
• kernel: blk-cgroup: Fix UAF in blkcg_unpin_online() (CVE-2024-56672)
• kernel: acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl (CVE-2024-56662)
• kernel: bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors (CVE-2024-56675)
• kernel: can: j1939: j1939_session_new(): fix skb reference counting (CVE-2024-56645)
• kernel: crypto: pcrypt - Call crypto layer directly when padata_do_parallel() return -EBUSY (CVE-2024-56690)
• kernel: io_uring: check if iowq is killed before queuing (CVE-2024-56709)
• kernel: rtc: check if __rtc_read_time was successful in rtc_timer_do_work() (CVE-2024-56739)
• kernel: bpf: put bpf_link's program when link is safe to be deallocated (CVE-2024-56786)
• kernel: igb: Fix potential invalid memory access in igb_init_module() (CVE-2024-52332)
• kernel: ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init() (CVE-2024-53680)
• kernel: netfilter: conntrack: clamp maximum hashtable size to INT_MAX (CVE-2025-21648)
• kernel: sched: sch_cake: add bounds checks to host bulk flow fairness counts (CVE-2025-21647)
• kernel: block, bfq: fix waker_bfqq UAF after bfq_split_bfqq() (CVE-2025-21631)
• kernel: zram: fix potential UAF of zram table (CVE-2025-21671)
• kernel: afs: Fix merge preference rule failure condition (CVE-2025-21672)
• kernel: mm: zswap: properly synchronize freeing resources during CPU hotunplug (CVE-2025-21693)
• kernel: cachestat: fix page cache statistics permission checking (CVE-2025-21691)
• kernel: mm: clear uffd-wp PTE/PMD state on mremap() (CVE-2025-21696)
• kernel: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 (CVE-2025-21702)
• kernel: usbnet: fix memory leak in error case (CVE-2022-49657)
• kernel: powerpc/xics: fix refcount leak in icp_opal_init() (CVE-2022-49432)
• kernel: net: tun: unlink NAPI from device on destruction (CVE-2022-49672)
• kernel: powerpc/papr_scm: don't requests stats with '0' sized stats buffer (CVE-2022-49353)
• kernel: powerpc/xive: Fix refcount leak in xive_spapr_init (CVE-2022-49437)
• kernel: ima: Fix potential memory leak in ima_init_crypto() (CVE-2022-49627)
• kernel: linux/dim: Fix divide by 0 in RDMA DIM (CVE-2022-49670)
• kernel: can: isotp: sanitize CAN ID…

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.

The SUSE Linux Enterprise 15 SP7 kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation (bsc#1239644).
• CVE-2024-28956: x86/ibt: Keep IBT disabled during alternative patching (bsc#1242006).
• CVE-2024-35840: mptcp: use OPTION_MPTCP_MPJ_SYNACK in subflow_finish_connect() (bsc#1224597).
• CVE-2024-35910: tcp: properly terminate timers for kernel sockets (bsc#1224489).
• CVE-2024-41005: netpoll: Fix race condition in netpoll_owner_active (bsc#1227858).
• CVE-2024-46713: kabi fix for perf/aux: Fix AUX buffer serialization (bsc#1230581).
• CVE-2024-46782: ila: call nf_unregister_net_hooks() sooner (bsc#1230769).
• CVE-2024-47408: net/smc: check smcd_v2_ext_offset when receiving proposal msg (bsc#1235711).
• CVE-2024-47794: kABI: bpf: Prevent tailcall infinite loop caused by freplace kABI workaround (bsc#1235712).
• CVE-2024-49570: drm/xe/tracing: Fix a potential TP_printk UAF (bsc#1238782).
• CVE-2024-49571: net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg (bsc#1235733).
• CVE-2024-50038: netfilter: xtables: fix typo causing some targets not to load on IPv6 (bsc#1231910).
• CVE-2024-50056: usb: gadget: uvc: Fix ERR_PTR dereference in uvc_v4l2.c (bsc#1232389).
• CVE-2024-50140: net: sched: use RCU read-side critical section in taprio_dump() (bsc#1233060).
• CVE-2024-50223: sched/numa: Fix the potential null pointer dereference in (bsc#1233192).
• CVE-2024-53057: net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT (bsc#1233551).
• CVE-2024-53124: net: fix data-races around sk->sk_forward_alloc (bsc#1234074).
• CVE-2024-53139: sctp: fix possible UAF in sctp_v6_available() (bsc#1234157).
• CVE-2024-53140: netlink: terminate outstanding dump on socket close (bsc#1234222).
• CVE-2024-53680: ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init() (bsc#1235715).
• CVE-2024-54458: scsi: ufs: bsg: Set bsg_queue to NULL after removal (bsc#1238992).
• CVE-2024-54683: netfilter: IDLETIMER: Fix for possible ABBA deadlock (bsc#1235729).
• CVE-2024-56638: kABI fix for 'netfilter: nft_inner: incorrect percpu area handling under softirq' (bsc#1235524).
• CVE-2024-56640: net/smc: fix LGR and link use-after-free issue (bsc#1235436).
• CVE-2024-56703: ipv6: Fix soft lockups in fib6_select_path under high next hop churn (bsc#1235455).
• CVE-2024-56718: net/smc: protect link down work from execute after lgr freed (bsc#1235589).
• CVE-2024-56719: net: stmmac: fix TSO DMA API usage causing oops (bsc#1235591).
• CVE-2024-56751: ipv6: release nexthop on device removal (bsc#1234936).
• CVE-2024-56758: btrfs: check folio mapping after unlock in relocate_one_folio() (bsc#1235621).
• CVE-2024-56770: net/sched: netem: account for backlog updates from child qdisc (bsc#1235637).
• CVE-2024-57900: ila: serialize calls to nf_register_net_hooks() (bsc#1235973).
• CVE-2024-57924: fs: relax assertions on failure to encode file handles (bsc#1236086).
• CVE-2024-57947: netfilter: nf_set_pipapo: fix initial map fill (bsc#1236333).
• CVE-2024-57974: udp: Deal with race between UDP socket address change and rehash (bsc#1238532).
• CVE-2024-58018: nvkm: correctly calculate the available space of the GSP cmdq buffer (bsc#1238990).
• CVE-2024-58019: nvkm/gsp: correctly advance the read pointer of GSP message queue (bsc#1238997).
• CVE-2024-58068: OPP: fix dev_pm_opp_find_bw_*() when bandwidth table not initialized (bsc#1238961).
• CVE-2024-58070: bpf: bpf_local_storage: Always use bpf_mem_alloc in PREEMPT_RT (bsc#1238983).
• CVE-2024-58071: team: prevent adding a device which is already a team device lower (bsc#1238970).
• CVE-2024-58074: drm/i915: Grab intel_display from the encoder to avoid potential (bsc#1238972).
• CVE-2024-58083: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() (bsc#1239036).
• CVE-2024-58088: bpf: Fix deadlock when freeing cgroup storage (bsc#1239510). -…

The SUSE Linux Enterprise 15 SP7 Azure kernel was updated to receive various security bugfixes.

The following security bugs were fixed:

• CVE-2023-52927: netfilter: allow exp not to be removed in nf_ct_find_expectation (bsc#1239644).
• CVE-2024-28956: x86/ibt: Keep IBT disabled during alternative patching (bsc#1242006).
• CVE-2024-35840: mptcp: use OPTION_MPTCP_MPJ_SYNACK in subflow_finish_connect() (bsc#1224597).
• CVE-2024-35910: tcp: properly terminate timers for kernel sockets (bsc#1224489).
• CVE-2024-41005: netpoll: Fix race condition in netpoll_owner_active (bsc#1227858).
• CVE-2024-46713: kabi fix for perf/aux: Fix AUX buffer serialization (bsc#1230581).
• CVE-2024-46782: ila: call nf_unregister_net_hooks() sooner (bsc#1230769).
• CVE-2024-47408: net/smc: check smcd_v2_ext_offset when receiving proposal msg (bsc#1235711).
• CVE-2024-47794: kABI: bpf: Prevent tailcall infinite loop caused by freplace kABI workaround (bsc#1235712).
• CVE-2024-49570: drm/xe/tracing: Fix a potential TP_printk UAF (bsc#1238782).
• CVE-2024-49571: net/smc: check iparea_offset and ipv6_prefixes_cnt when receiving proposal msg (bsc#1235733).
• CVE-2024-50038: netfilter: xtables: fix typo causing some targets not to load on IPv6 (bsc#1231910).
• CVE-2024-50056: usb: gadget: uvc: Fix ERR_PTR dereference in uvc_v4l2.c (bsc#1232389).
• CVE-2024-50140: net: sched: use RCU read-side critical section in taprio_dump() (bsc#1233060).
• CVE-2024-50223: sched/numa: Fix the potential null pointer dereference in (bsc#1233192).
• CVE-2024-53057: net/sched: stop qdisc_tree_reduce_backlog on TC_H_ROOT (bsc#1233551).
• CVE-2024-53124: net: fix data-races around sk->sk_forward_alloc (bsc#1234074).
• CVE-2024-53139: sctp: fix possible UAF in sctp_v6_available() (bsc#1234157).
• CVE-2024-53140: netlink: terminate outstanding dump on socket close (bsc#1234222).
• CVE-2024-53680: ipvs: fix UB due to uninitialized stack access in ip_vs_protocol_init() (bsc#1235715).
• CVE-2024-54458: scsi: ufs: bsg: Set bsg_queue to NULL after removal (bsc#1238992).
• CVE-2024-54683: netfilter: IDLETIMER: Fix for possible ABBA deadlock (bsc#1235729).
• CVE-2024-56638: kABI fix for 'netfilter: nft_inner: incorrect percpu area handling under softirq' (bsc#1235524).
• CVE-2024-56640: net/smc: fix LGR and link use-after-free issue (bsc#1235436).
• CVE-2024-56703: ipv6: Fix soft lockups in fib6_select_path under high next hop churn (bsc#1235455).
• CVE-2024-56718: net/smc: protect link down work from execute after lgr freed (bsc#1235589).
• CVE-2024-56719: net: stmmac: fix TSO DMA API usage causing oops (bsc#1235591).
• CVE-2024-56751: ipv6: release nexthop on device removal (bsc#1234936).
• CVE-2024-56758: btrfs: check folio mapping after unlock in relocate_one_folio() (bsc#1235621).
• CVE-2024-56770: net/sched: netem: account for backlog updates from child qdisc (bsc#1235637).
• CVE-2024-57900: ila: serialize calls to nf_register_net_hooks() (bsc#1235973).
• CVE-2024-57924: fs: relax assertions on failure to encode file handles (bsc#1236086).
• CVE-2024-57947: netfilter: nf_set_pipapo: fix initial map fill (bsc#1236333).
• CVE-2024-57974: udp: Deal with race between UDP socket address change and rehash (bsc#1238532).
• CVE-2024-58018: nvkm: correctly calculate the available space of the GSP cmdq buffer (bsc#1238990).
• CVE-2024-58019: nvkm/gsp: correctly advance the read pointer of GSP message queue (bsc#1238997).
• CVE-2024-58068: OPP: fix dev_pm_opp_find_bw_*() when bandwidth table not initialized (bsc#1238961).
• CVE-2024-58070: bpf: bpf_local_storage: Always use bpf_mem_alloc in PREEMPT_RT (bsc#1238983).
• CVE-2024-58071: team: prevent adding a device which is already a team device lower (bsc#1238970).
• CVE-2024-58074: drm/i915: Grab intel_display from the encoder to avoid potential (bsc#1238972).
• CVE-2024-58083: KVM: Explicitly verify target vCPU is online in kvm_get_vcpu() (bsc#1239036).
• CVE-2024-58088: bpf: Fix deadlock when freeing cgroup storage (bsc#1239510). -…

Rejected reason: This CVE ID has been rejected or withdrawn by its CVE Numbering Authority.