RHSA-2026:91492HighCVSS 8.8

Red Hat Security Advisory: kernel security, bug fix, and enhancement update

Published
October 28, 2026
Last Modified
October 30, 2026

🔗 CVE IDs covered (22)

CVE-2026-74556 →CVE-2026-31581 →CVE-2026-64319 →CVE-2024-36286 →CVE-2025-68745 →CVE-2026-43450 →CVE-2026-52972 →CVE-2026-72130 →CVE-2026-72243 →CVE-2026-74641 →CVE-2025-39797 →CVE-2026-43020 →CVE-2026-63802 →CVE-2026-63831 →CVE-2026-68086 →CVE-2026-80522 →CVE-2026-89846 →CVE-2026-46149 →CVE-2026-63993 →CVE-2026-64320 →CVE-2026-64490 →CVE-2026-68200 →

📋 Description

CVE-2024-36286 — kernel: netfilter: nfnetlink_queue: acquire rcu_read_lock() in instance_destroy_rcu() CVE-2025-39797 — kernel: xfrm: Duplicate SPI Handling CVE-2025-68745 — kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset CVE-2026-31581 — kernel: ALSA: 6fire: fix use-after-free on disconnect CVE-2026-43020 — kernel: Bluetooth: MGMT: validate LTK enc_size on load CVE-2026-43450 — kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() CVE-2026-46149 — kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() CVE-2026-52972 — kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 CVE-2026-63802 — kernel: blk-cgroup: fix UAF in __blkcg_rstat_flush() CVE-2026-63831 — kernel: mac802154: llsec: add skb_cow_data() before in-place crypto CVE-2026-63993 — kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() CVE-2026-64319 — kernel: nvmet-auth: validate reply message payload bounds against transfer length CVE-2026-64320 — kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page CVE-2026-64490 — kernel: ALSA: virtio: Validate control metadata from the device CVE-2026-68086 — kernel: mm/khugepaged: write all dirty file folios when collapsing CVE-2026-68200 — kernel: Linux kernel: ALSA timer use-after-free vulnerability allows privilege escalation CVE-2026-72130 — kernel: nvmet-auth: reject short AUTH_RECEIVE buffers CVE-2026-72243 — kernel: selinux: check connect-related permissions on TCP Fast Open CVE-2026-74556 — kernel: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer CVE-2026-74641 — kernel: ALSA: usx2y: bound the hwdep mmap fault offset CVE-2026-80522 — kernel: crypto: tegra - fix rctx->cryptlen calculation in tegra_gcm_do_one_req() CVE-2026-89846 — kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read

🎯 Affected products200

  • Red Hat CodeReady Linux Builder EUS (v.9.6)
  • Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • Red Hat Enterprise Linux Real Time EUS (v.9.6)
  • Red Hat Enterprise Linux Real Time for NFV EUS (v.9.6)
  • kernel-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-0:5.14.0-570.152.1.el9_6.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-0:5.14.0-570.152.1.el9_6.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-0:5.14.0-570.152.1.el9_6.src as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-0:5.14.0-570.152.1.el9_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-core-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-core-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat CodeReady Linux Builder EUS (v.9.6)
  • kernel-64k-debug-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-debug-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.6)
  • kernel-64k-debug-devel-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-debug-devel-matched-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-debug-modules-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-modules-core-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debug-modules-extra-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat CodeReady Linux Builder EUS (v.9.6)
  • kernel-64k-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • kernel-64k-debuginfo-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux Real Time EUS (v.9.6)
  • kernel-64k-devel-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-devel-matched-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v.9.6)
  • kernel-64k-modules-0:5.14.0-570.152.1.el9_6.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v.9.6)
  • +170 more not shown

✅ Remediation

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. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: To mitigate this issue, if the `qla2xxx` SCSI driver is not required, it can be prevented from loading by blacklisting the module. This can be achieved by creating a modprobe configuration file. 1. Create a file named `/etc/modprobe.d/blacklist-qla2xxx.conf` with the following content: ``` blacklist qla2xxx install qla2xxx /bin/true ``` 2. Rebuild the initial ramdisk: ```bash dracut -f -v ``` 3. Reboot the system for the changes to take effect. This mitigation will prevent the `qla2xxx` module from loading, which may impact systems relying on QLogic Fibre Channel HBAs. A system reboot is required for the changes to take full effect. Workaround: To mitigate this issue, prevent the snd_usb_6fire module from being loaded. See https://access.redhat.com/solutions/41278 for instructions. Workaround: To mitigate this issue, prevent module virtio_snd from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: To mitigate this issue, ensure that in-band DH-HMAC-CHAP authentication is not configured on NVMe-oF targets if it is not strictly required. This vulnerability is only exploitable when this specific authentication mechanism is enabled. Consult NVMe-oF documentation for your specific setup to disable DH-HMAC-CHAP authentication if it is currently enabled and not required. Workaround: To mitigate this issue, TCP Fast Open (TFO) can be disabled if not required by applications. Disabling TFO prevents the vulnerable code path from being exercised, thereby eliminating the SELinux permission bypass. To disable TCP Fast Open: 1. Check the current setting: `sysctl net.ipv4.tcp_fastopen` 2. To disable it temporarily: `sudo sysctl -w net.ipv4.tcp_fastopen=0` 3. To make the change persistent across reboots, add or modify the following line in `/etc/sysctl.conf`: `net.ipv4.tcp_fastopen = 0` 4. Apply the persistent changes: `sudo sysctl -p` Disabling TCP Fast Open may impact the performance of applications that utilize this feature for faster connection establishment. Workaround: If iSCSI initiator functionality is not required, prevent the `libiscsi_tcp` kernel module from loading by blacklisting it. Create a file such as `/etc/modprobe.d/blacklist-iscsi.conf` with the content `blacklist libiscsi_tcp`. A system reboot is required for this change to take effect. This may impact systems relying on iSCSI storage. Workaround: To mitigate this issue, prevent module snd-usb-usx2y and ALSA (Advanced Linux Sound Architecture) from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically. Workaround: To prevent the `tegra_se_aes` crypto module from being loaded, blacklist it by creating a configuration file. Create `/etc/modprobe.d/blacklist-tegra.conf` with the content: ``` blacklist tegra_se_aes ``` Then, regenerate the initramfs and reboot the system for the changes to take effect: ```bash dracut -f -v $(uname -r) reboot ``` This action may affect system functionality if NVIDIA Tegra hardware and its cryptographic features are actively utilized. Workaround: If QLogic Fibre Channel HBAs are not in use, the 'qla2xxx' kernel module can be blacklisted to prevent it from loading. This can be achieved by creating a modprobe configuration file. To blacklist the module: 1. Create a file named `/etc/modprobe.d/blacklist-qla2xxx.conf` with the following content: `blacklist qla2xxx` 2. Regenerate the initramfs to ensure the blacklist is applied during boot: `sudo dracut -f -v` (for RHEL 7/8/9) `sudo mkinitcpio -P` (for Arch-based systems, if applicable) 3. Reboot the system for the changes to take effect. Warning: Blacklisting this module will disable functionality for QLogic Fibre Channel HBAs. Ensure that this hardware is not required before applying this mitigation. A system reboot is required for the changes to take effect.

🔗 References (26)