RHSA-2026:0537 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.0 Update Services for SAP Solutions.

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

Security Fix(es):

• kernel: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock (CVE-2023-52638)
• kernel: smb: client: fix potential UAF in cifs_stats_proc_write() (CVE-2024-35868)
• kernel: Linux kernel: SCTP use-after-free due to race condition in sendmsg (CVE-2025-23142)
• kernel: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm() (CVE-2025-38724)
• kernel: smb: client: fix race with concurrent opens in rename(2) (CVE-2025-39825)
• kernel: can: j1939: implement NETDEV_UNREGISTER notification handler (CVE-2025-39925)
• kernel: net/mlx5e: Check for NOT_READY flag state after locking (CVE-2023-53581)
• kernel: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL (CVE-2023-53680)
• kernel: scsi: ses: Fix possible desc_ptr out-of-bounds accesses (CVE-2023-53675)
• kernel: Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync (CVE-2025-39982)
• kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv() (CVE-2023-53705)
• kernel: usb: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths (CVE-2025-68287)
• kernel: libceph: fix potential use-after-free in have_mon_and_osd_map() (CVE-2025-68285)

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.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.0 x86_64

Fixes

• BZ - 2273082 - CVE-2023-52638 kernel: can: j1939: prevent deadlock by changing j1939_socks_lock to rwlock
• BZ - 2281745 - CVE-2024-35868 kernel: smb: client: fix potential UAF in cifs_stats_proc_write()
• BZ - 2363300 - CVE-2025-23142 kernel: Linux kernel: SCTP use-after-free due to race condition in sendmsg
• BZ - 2393172 - CVE-2025-38724 kernel: nfsd: handle get_client_locked() failure in nfsd4_setclientid_confirm()
• BZ - 2395792 - CVE-2025-39825 kernel: smb: client: fix race with concurrent opens in rename(2)
• BZ - 2400629 - CVE-2025-39925 kernel: can: j1939: implement NETDEV_UNREGISTER notification handler
• BZ - 2401545 - CVE-2023-53581 kernel: net/mlx5e: Check for NOT_READY flag state after locking
• BZ - 2402213 - CVE-2023-53680 kernel: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL
• BZ - 2402293 - CVE-2023-53675 kernel: scsi: ses: Fix possible desc_ptr out-of-bounds accesses
• BZ - 2404100 - CVE-2025-39982 kernel: Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync
• BZ - 2405713 - CVE-2023-53705 kernel: ipv6: Fix out-of-bounds access in ipv6_find_tlv()
• BZ - 2422788 - CVE-2025-68287 kernel: usb: dwc3: Fix race condition between concurrent dwc3_remove_requests() call paths
• BZ - 2422801 - CVE-2025-68285 kernel: libceph: fix potential use-after-free in have_mon_and_osd_map()

CVEs

• CVE-2023-52638
• CVE-2023-53581
• CVE-2023-53675
• CVE-2023-53680
• CVE-2023-53705
• CVE-2024-35868
• CVE-2025-23142
• CVE-2025-38724
• CVE-2025-39825
• CVE-2025-39925
• CVE-2025-39982
• CVE-2025-68285
• CVE-2025-68287

References

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