RHSA-2026:91585HighCVSS 7.3

Red Hat Security Advisory: kernel security update

Published
October 28, 2026
Last Modified
October 30, 2026

🔗 CVE IDs covered (9)

CVE-2025-68745 →CVE-2026-43493 →CVE-2026-46259 →CVE-2026-52972 →CVE-2026-63831 →CVE-2026-64320 →CVE-2026-89846 →CVE-2026-31692 →CVE-2026-72243 →

📋 Description

CVE-2025-68745 — kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset CVE-2026-31692 — kernel: rtnetlink: add missing netlink_ns_capable() check for peer netns CVE-2026-43493 — kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests CVE-2026-46259 — kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() CVE-2026-52972 — kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 CVE-2026-63831 — kernel: mac802154: llsec: add skb_cow_data() before in-place crypto CVE-2026-64320 — kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page CVE-2026-72243 — kernel: selinux: check connect-related permissions on TCP Fast Open CVE-2026-89846 — kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read

🎯 Affected products52

  • Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • bpftool-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • bpftool-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • bpftool-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • bpftool-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-0:4.18.0-305.216.1.el8_4.src as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-0:4.18.0-305.216.1.el8_4.src as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-abi-stablelists-0:4.18.0-305.216.1.el8_4.noarch as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-abi-stablelists-0:4.18.0-305.216.1.el8_4.noarch as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-core-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-core-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-core-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-core-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-devel-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-devel-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-modules-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-modules-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debug-modules-extra-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debug-modules-extra-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debuginfo-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • kernel-debuginfo-common-x86_64-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.4)
  • kernel-debuginfo-common-x86_64-0:4.18.0-305.216.1.el8_4.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4)
  • +22 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: 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, 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 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 (13)