RHSA-2026:15883HighCVSS 8.1

Red Hat Security Advisory: kernel security update

Published
May 11, 2026
Last Modified
November 5, 2026

🔗 CVE IDs covered (6)

CVE-2026-23097 →CVE-2026-23139 →CVE-2026-23243 →CVE-2026-23401 →CVE-2026-31402 →CVE-2026-31532 →

📋 Description

CVE-2026-23097 — kernel: Linux kernel: Denial of Service due to a deadlock in hugetlb folio migration CVE-2026-23139 — kernel: netfilter: nf_conncount: update last_gc only when GC has been performed CVE-2026-23243 — kernel: Linux kernel: Denial of service and memory corruption in RDMA umad CVE-2026-23401 — kernel: Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling CVE-2026-31402 — kernel: nfsd: fix heap overflow in NFSv4.0 LOCK replay cache CVE-2026-31532 — kernel: can: raw: fix ro->uniq use-after-free in raw_rcv()

🎯 Affected products200

  • Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • Red Hat Enterprise Linux Real Time EUS (v. 10.0)
  • Red Hat Enterprise Linux Real Time for NFV EUS (v. 10.0)
  • kernel-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-0:6.12.0-55.72.1.el10_0.ppc64le as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-0:6.12.0-55.72.1.el10_0.s390x as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-0:6.12.0-55.72.1.el10_0.src as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-0:6.12.0-55.72.1.el10_0.x86_64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-core-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-core-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-debug-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • kernel-64k-debug-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux Real Time EUS (v. 10.0)
  • kernel-64k-debug-devel-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-debug-devel-matched-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-debug-modules-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-modules-core-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debug-modules-extra-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • kernel-64k-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0)
  • kernel-64k-debuginfo-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux Real Time EUS (v. 10.0)
  • kernel-64k-devel-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-devel-matched-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 10.0)
  • kernel-64k-modules-0:6.12.0-55.72.1.el10_0.aarch64 as a component of Red Hat Enterprise Linux BaseOS EUS (v. 10.0)
  • +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. 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, prevent module ib_umad 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: Mitigation for this issue is either not available or the currently available options don't 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, prevent the `can` kernel module from loading if CAN functionality is not required. This can be achieved by blacklisting the module. Create a file named `/etc/modprobe.d/blacklist-can.conf` with the following content: ``` blacklist can install can /bin/true ``` After creating the file, regenerate the initramfs and reboot the system for the changes to take effect. ```bash dracut -f -v reboot ``` This mitigation may impact systems that rely on CAN interfaces for their operation.

🔗 References (9)