RHSA-2026:94996CriticalCVSS 9.8

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

Published
November 4, 2026
Last Modified
November 12, 2026

🔗 CVE IDs covered (13)

CVE-2026-89481 →CVE-2026-46259 →CVE-2026-64534 →CVE-2026-68159 →CVE-2026-68476 →CVE-2026-74641 →CVE-2026-74669 →CVE-2026-98432 →CVE-2026-99284 →CVE-2025-71066 →CVE-2026-68155 →CVE-2026-68156 →CVE-2026-80714 →

📋 Description

CVE-2025-71066 — kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change CVE-2026-46259 — kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() CVE-2026-64534 — kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path CVE-2026-68155 — kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps CVE-2026-68156 — kernel: libceph: refresh auth->authorizer_buf{,_len} after authorizer update CVE-2026-68159 — kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap CVE-2026-68476 — kernel: ipvs: reload ip header after head reallocation CVE-2026-74641 — kernel: ALSA: usx2y: bound the hwdep mmap fault offset CVE-2026-74669 — kernel: ipvs: clear IPv4 options after rebasing tunnel ICMP errors CVE-2026-80714 — kernel: ipvs: do not propagate one-packet flag to synced conns CVE-2026-89481 — kernel: nvme-tcp: fix host memory disclosure on R2T for a read command CVE-2026-98432 — kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period CVE-2026-99284 — kernel: kernel: privilege escalation via missing shared fragment flag in skb_zerocopy

🎯 Affected products52

  • Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • bpftool-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • bpftool-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • bpftool-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-0:4.18.0-372.227.1.el8_6.src as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-0:4.18.0-372.227.1.el8_6.src as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-abi-stablelists-0:4.18.0-372.227.1.el8_6.noarch as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-abi-stablelists-0:4.18.0-372.227.1.el8_6.noarch as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-core-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-core-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-core-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-core-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-devel-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-devel-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-modules-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-modules-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debug-modules-extra-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debug-modules-extra-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debuginfo-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • kernel-debuginfo-common-x86_64-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS AUS (v.8.6)
  • kernel-debuginfo-common-x86_64-0:4.18.0-372.227.1.el8_6.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6)
  • +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: If NVMe over TCP target functionality is not required, the vulnerable code path can be avoided by not loading or by blacklisting the nvmet-tcp kernel module. For systems where NVMe/TCP targets are needed, restrict access to trusted initiators via host NQN allowlists and network segmentation to reduce the attack surface. Workaround: To mitigate this vulnerability, prevent the `ceph` kernel module from loading if Ceph client functionality is not in use. Create a file `/etc/modprobe.d/ceph.conf` with `install ceph /bin/true`. If the module is currently loaded, unload it using `rmmod ceph`. A system reboot is required for the changes to take full effect and ensure the module is not reloaded. Unloading the `ceph` module will impact systems actively using Ceph client features. Workaround: If the system does not require the `libceph` module for Ceph cluster connectivity, prevent the `ceph` kernel module from loading by blacklisting it. Create a file `/etc/modprobe.d/ceph.conf` with the content `blacklist ceph`. After creating the file, regenerate the initramfs using `dracut -f -v` and reboot the system for the changes to take effect. If `libceph` is in use, restrict network access to Ceph monitors to trusted hosts through firewall rules to reduce the attack surface. 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 mitigate this issue, prevent the `ip_vs` kernel module from loading. This can be achieved by creating a blacklist rule. 1. Unload the module if currently loaded: `sudo modprobe -r ip_vs` 2. Create a blacklist configuration file: `echo "blacklist ip_vs" | sudo tee /etc/modprobe.d/disable-ip_vs.conf` 3. Rebuild the initial RAM disk to ensure the module is not loaded at boot: `sudo dracut -f` A system reboot is required for the changes to take full effect. Disabling this module will prevent the use of IP Virtual Server (IPVS) functionality. Workaround: To mitigate this issue, prevent the `ip_vs` kernel module from loading. This can be achieved by creating a blacklist rule. Note that this may impact systems utilizing IPVS for load balancing. 1. Create a configuration file to blacklist the module: `echo "blacklist ip_vs" > /etc/modprobe.d/disable-ip_vs.conf` 2. Regenerate the initramfs to ensure the blacklist is applied at boot: `dracut -f -v` 3. Reboot the system for the changes to take effect: `reboot` Alternatively, if the module is currently loaded, it can be unloaded (if no dependencies exist): `rmmod ip_vs` However, a system reboot is recommended to ensure the module is not loaded on subsequent boots. Workaround: Prevent the nvme-tcp kernel module from loading if NVMe over TCP storage is not required on the system. 1. Add an entry to /etc/modprobe.d to prevent the module from loading: # echo "install nvme-tcp /bin/true" >> /etc/modprobe.d/disable-nvme-tcp.conf 2. If the module is currently loaded and not in use by any storage target, unload it: # modprobe -r nvme-tcp Caveats: Disabling this module prevents the system from connecting to NVMe over TCP block storage devices. Warning: Do not attempt to unload this module if active NVMe over TCP storage is mounted or in use, as doing so will cause I/O failure and potential data loss. If the module cannot be cleanly unloaded, a system restart is required for the change to take full effect. Additionally, restrict NVMe-oF connections to verified, trusted storage targets over isolated or encrypted network fabrics. Workaround: See the security bulletin for a detailed mitigation procedure. 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.

🔗 References (16)