RHSA-2026:97873 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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

Security Fix(es):

• kernel: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets (CVE-2025-22063)
• kernel: can: bcm: add locking for bcm_op runtime updates (CVE-2025-38004)
• kernel: calipso: Don't call calipso functions for AF_INET sk. (CVE-2025-38147)
• kernel: thermal: core: Fix thermal zone device registration error path (CVE-2026-43332)
• kernel: sctp: stream: fully roll back denied add-stream state (CVE-2026-52929)
• kernel: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN (CVE-2026-53176)
• kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)
• kernel: vsock/virtio: fix zerocopy completion for multi-skb sends (CVE-2026-53365)
• kernel: USB: serial: mxuport: fix memory corruption with small endpoint (CVE-2026-63899)
• kernel: bridge: mcast: Fix a possible use-after-free when removing a bridge port (CVE-2026-64032)
• kernel: usb: typec: tcpm: bound altmode_desc[] per iteration in svdm_consume_modes() (CVE-2026-63962)
• kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034)
• kernel: vsock/virtio: bind uarg before filling zerocopy skb (CVE-2026-63970)
• kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access (CVE-2026-64018)
• kernel: igc: set tx buffer type for SMD frames (CVE-2026-64035)
• kernel: idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init() (CVE-2026-64162)
• kernel: vsock/vmci: fix UAF when peer resets connection during handshake (CVE-2026-64115)
• kernel: ALSA: hda/cs35l41: Fix firmware load work teardown (CVE-2026-64481)
• kernel: Kernel: Remote out-of-bounds write in RDMA/siw (CVE-2026-64268)
• kernel: fuse: re-lock request before returning from fuse_ref_folio() (CVE-2026-64266)
• kernel: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path (CVE-2026-64303)
• kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs() (CVE-2026-64378)
• kernel: drm/amd/display: set new_stream to NULL after release (CVE-2026-68236)
• kernel: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads (CVE-2026-68293)
• kernel: ALSA: seq: close a re-opened queue timer in the destructor (CVE-2026-68202)
• kernel: Linux kernel: Denial of Service due to use-after-free in act_tunnel_key (CVE-2026-68377)
• kernel: drm/dp/mst: fix buffer overflows in sideband chunk accumulation (CVE-2026-68278)
• kernel: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets (CVE-2026-68299)
• kernel: drm/amdgpu: fix lifetime issue of amdgpu_vm_get_task_info_pasid() (CVE-2026-68245)
• kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE (CVE-2026-72083)
• kernel: KVM: arm64: vgic: Check the interrupt is still ours before migrating it (CVE-2026-72289)
• kernel: tipc: require net admin for TIPCv2 netlink mutators (CVE-2026-74283)
• kernel: Bluetooth: hci_sync: Fix advertising data UAFs (CVE-2026-74509)
• kernel: Bluetooth: mgmt: fix UAF in pair command cancellation (CVE-2026-74510)
• kernel: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled (CVE-2026-74515)
• kernel: udp: fix potential use-after-free in tunnel segmentation (CVE-2026-74705)
• kernel: xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN (CVE-2026-80530)
• kernel: xfs: bounds-check buffer log item's dirty bitmap (CVE-2026-80536)
• kernel: drm/vmwgfx: use check_add_overflow for shader size+offset bound (CVE-2026-80887)
• kernel: smb: client: reject a tree connect response whose byte count is too small (CVE-2026-89631)
• kernel: net/smc: carry oversized SMC-Rv2 LLC messages in the queue entry (CVE-2026-80985)
• kernel: openvswitch: Fix CT limit teardown use-after-free (CVE-2026-89488)
• kernel: entry: Fix seccomp bypass after ptrace with TSYNC (CVE-2026-89603)
• kernel: vfio/pci: clear vdev->msi_perm after freeing it on init failure (CVE-2026-89777)
• kernel: scsi: target: iscsi: Reserve a terminator byte for the login payload (CVE-2026-90011)
• kernel: drm/amdkfd: Add TLB flush after MES queue eviction/suspension (CVE-2026-89811)
• kernel: PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers (CVE-2026-90315)
• kernel: perf: Fix addr_filter_ranges lifetime (CVE-2026-93817)
• kernel: virtio-fs: avoid double-free on failed queue setup (CVE-2026-93827)
• kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()
• kernel: xfrm: hold net_device reference under RCU in bundle creation (CVE-2026-98364)
• kernel: exec: Cleanup POSIX timers right after de_thread() (CVE-2026-98260)
• kernel: netfilter: flowtable: hold reference on ct until flow is released (CVE-2026-98320)
• kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)
• kernel: KVM: arm64: Transfer the hyp stack pages out of the host stage-2 (CVE-2026-98466)
• kernel: nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge() (CVE-2026-98725)
• kernel: kernel: xfs: Unauthorized data modification via improper file size exchange handling (CVE-2026-98974)

Bug Fix(es) and Enhancement(s):

• RHEL 9.8: Multiuser Kerberized DFS shares fail to mount with UID mount option [rhel-9.9.z] (JIRA:RHEL-254109)
• Backport request: bonding: only set speed/duplex to unknown, if getting speed failed [rhel-9.9] (JIRA:RHEL-174325)
• [RHEL-9.9] gfp: include __GFP_NOWARN in GFP_NOWAIT (JIRA:RHEL-249621)
• gfs2: Get rid of sd_async_glock_wait [rhel-9.9.z] (JIRA:RHEL-254079)
• TLS-related kernel panics in kernel-5.14.0-741.10.1.el9_9 and higher (JIRA:RHEL-283336)
• RHEL is missing support for conntrack zone filtering in dump/delete requests (9.10) [rhel-9.9.z] (JIRA:RHEL-291353)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for x86_64 9 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 9 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 9 aarch64
• Red Hat CodeReady Linux Builder for IBM z Systems 9 s390x

Fixes

• BZ - 2360273 - CVE-2025-22063 kernel: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets
• BZ - 2370992 - CVE-2025-38004 kernel: can: bcm: add locking for bcm_op runtime updates
• BZ - 2376106 - CVE-2025-38147 kernel: calipso: Don't call calipso functions for AF_INET sk.
• BZ - 2468043 - CVE-2026-43332 kernel: thermal: core: Fix thermal zone device registration error path
• BZ - 2492108 - CVE-2026-52929 kernel: sctp: stream: fully roll back denied add-stream state
• BZ - 2492741 - CVE-2026-53176 kernel: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
• BZ - 2492851 - CVE-2026-53264 kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle
• BZ - 2499742 - CVE-2026-53365 kernel: vsock/virtio: fix zerocopy completion for multi-skb sends
• BZ - 2502325 - CVE-2026-63899 kernel: USB: serial: mxuport: fix memory corruption with small endpoint
• BZ - 2502332 - CVE-2026-64032 kernel: bridge: mcast: Fix a possible use-after-free when removing a bridge port
• BZ - 2502356 - CVE-2026-63962 kernel: usb: typec: tcpm: bound altmode_desc[] per iteration in svdm_consume_modes()
• BZ - 2502394 - CVE-2026-64034 kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
• BZ - 2502411 - CVE-2026-63970 kernel: vsock/virtio: bind uarg before filling zerocopy skb
• BZ - 2502421 - CVE-2026-64018 kernel: net: mana: validate rx_req_idx to prevent out-of-bounds array access
• BZ - 2502476 - CVE-2026-64035 kernel: igc: set tx buffer type for SMD frames
• BZ - 2502521 - CVE-2026-64162 kernel: idpf: fix read_dev_clk_lock spinlock init in idpf_ptp_init()
• BZ - 2502593 - CVE-2026-64115 kernel: vsock/vmci: fix UAF when peer resets connection during handshake
• BZ - 2507038 - CVE-2026-64481 kernel: ALSA: hda/cs35l41: Fix firmware load work teardown
• BZ - 2507089 - CVE-2026-64268 kernel: Kernel: Remote out-of-bounds write in RDMA/siw
• BZ - 2507098 - CVE-2026-64266 kernel: fuse: re-lock request before returning from fuse_ref_folio()
• BZ - 2507222 - CVE-2026-64303 kernel: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
• BZ - 2507296 - CVE-2026-64378 kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs()
• BZ - 2513148 - CVE-2026-68236 kernel: drm/amd/display: set new_stream to NULL after release
• BZ - 2513150 - CVE-2026-68293 kernel: net/mlx5: Fix MCIA register buffer overflow on 32 dword reads
• BZ - 2513245 - CVE-2026-68202 kernel: ALSA: seq: close a re-opened queue timer in the destructor
• BZ - 2513277 - CVE-2026-68377 kernel: Linux kernel: Denial of Service due to use-after-free in act_tunnel_key
• BZ - 2513287 - CVE-2026-68278 kernel: drm/dp/mst: fix buffer overflows in sideband chunk accumulation
• BZ - 2513356 - CVE-2026-68299 kernel: vmxnet3: fix BUG_ON in vmxnet3_get_hdr_len() for Geneve packets
• BZ - 2513430 - CVE-2026-68245 kernel: drm/amdgpu: fix lifetime issue of amdgpu_vm_get_task_info_pasid()
• BZ - 2516579 - CVE-2026-72083 kernel: scsi: target: core: Fix iSCSI ISID use-after-free in REGISTER AND MOVE
• BZ - 2516657 - CVE-2026-72289 kernel: KVM: arm64: vgic: Check the interrupt is still ours before migrating it
• BZ - 2516935 - CVE-2026-74283 kernel: tipc: require net admin for TIPCv2 netlink mutators
• BZ - 2516967 - CVE-2026-74509 kernel: Bluetooth: hci_sync: Fix advertising data UAFs
• BZ - 2516970 - CVE-2026-74510 kernel: Bluetooth: mgmt: fix UAF in pair command cancellation
• BZ - 2517006 - CVE-2026-74515 kernel: KVM: s390: pci: Reject adapter interrupt forwarding if already enabled
• BZ - 2521498 - CVE-2026-74705 kernel: udp: fix potential use-after-free in tunnel segmentation
• BZ - 2524492 - CVE-2026-80530 kernel: xfs: fix exchange-range reflink flag clearing issue with INO1_WRITTEN
• BZ - 2524501 - CVE-2026-80536 kernel: xfs: bounds-check buffer log item's dirty bitmap
• BZ - 2528788 - CVE-2026-80887 kernel: drm/vmwgfx: use check_add_overflow for shader size+offset bound
• BZ - 2532089 - CVE-2026-89631 kernel: smb: client: reject a tree connect response whose byte count is too small
• BZ - 2532279 - CVE-2026-80985 kernel: net/smc: carry oversized SMC-Rv2 LLC messages in the queue entry
• BZ - 2532407 - CVE-2026-89488 kernel: openvswitch: Fix CT limit teardown use-after-free
• BZ - 2532493 - CVE-2026-89603 kernel: entry: Fix seccomp bypass after ptrace with TSYNC
• BZ - 2535066 - CVE-2026-89777 kernel: vfio/pci: clear vdev->msi_perm after freeing it on init failure
• BZ - 2535227 - CVE-2026-90011 kernel: scsi: target: iscsi: Reserve a terminator byte for the login payload
• BZ - 2535309 - CVE-2026-89811 kernel: drm/amdkfd: Add TLB flush after MES queue eviction/suspension
• BZ - 2536264 - CVE-2026-90315 kernel: PCI/sysfs: Add lockdown checks to legacy I/O and memory handlers
• BZ - 2540391 - CVE-2026-93817 kernel: perf: Fix addr_filter_ranges lifetime
• BZ - 2540396 - CVE-2026-93827 kernel: virtio-fs: avoid double-free on failed queue setup
• BZ - 2540872 - kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation
• BZ - 2546487 - CVE-2026-98364 kernel: xfrm: hold net_device reference under RCU in bundle creation
• BZ - 2546491 - CVE-2026-98260 kernel: exec: Cleanup POSIX timers right after de_thread()
• BZ - 2546494 - CVE-2026-98320 kernel: netfilter: flowtable: hold reference on ct until flow is released
• BZ - 2553390 - CVE-2026-98432 kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period
• BZ - 2554835 - CVE-2026-98466 kernel: KVM: arm64: Transfer the hyp stack pages out of the host stage-2
• BZ - 2555068 - CVE-2026-98725 kernel: nvmet-auth: fix out-of-bounds write in nvmet_auth_challenge()
• BZ - 2559811 - CVE-2026-98974 kernel: kernel: xfs: Unauthorized data modification via improper file size exchange handling

CVEs

• CVE-2025-22063
• CVE-2025-38004
• CVE-2025-38147
• CVE-2026-43332
• CVE-2026-53365
• CVE-2026-63899
• CVE-2026-63962
• CVE-2026-63970
• CVE-2026-64018
• CVE-2026-64034
• CVE-2026-64035
• CVE-2026-64162
• CVE-2026-64266
• CVE-2026-64268
• CVE-2026-64378
• CVE-2026-64481
• CVE-2026-68202
• CVE-2026-68236
• CVE-2026-68245
• CVE-2026-68278
• CVE-2026-68293
• CVE-2026-68299
• CVE-2026-72083
• CVE-2026-72289
• CVE-2026-72319
• CVE-2026-74705
• CVE-2026-80536
• CVE-2026-80887
• CVE-2026-80985
• CVE-2026-89631
• CVE-2026-89777
• CVE-2026-89811
• CVE-2026-90011
• CVE-2026-93817
• CVE-2026-93827
• CVE-2026-98260
• CVE-2026-98320
• CVE-2026-98466
• CVE-2026-98725

References

• https://access.redhat.com/security/updates/classification/#important