RHSA-2026:55764HighCVSS 7.8

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

Published
August 17, 2026
Last Modified
September 8, 2026

🔗 CVE IDs covered (10)

CVE-2026-43206 →CVE-2026-53016 →CVE-2026-53136 →CVE-2026-53374 →CVE-2025-39902 →CVE-2026-53329 →CVE-2026-63879 →CVE-2026-63884 →CVE-2026-64219 →CVE-2026-17523 →

📋 Description

CVE-2025-39902 — kernel: mm/slub: avoid accessing metadata when pointer is invalid in object_err() CVE-2026-17523 — kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges CVE-2026-43206 — kernel: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() CVE-2026-53016 — kernel: crypto: ccp - copy IV using skcipher ivsize CVE-2026-53136 — kernel: drm/amd/display: Clamp VBIOS HDMI retimer register count to array size CVE-2026-53329 — kernel: drm/amd/display: Use krealloc_array() in dal_vector_reserve() CVE-2026-53374 — kernel: drm/amdgpu: zero-initialize GART table on allocation CVE-2026-63879 — kernel: drm/amdgpu: fix amdgpu_hmm_range_get_pages CVE-2026-63884 — kernel: drm/i915: Fix potential UAF in TTM object purge CVE-2026-64219 — kernel: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async

🎯 Affected products122

  • Red Hat Enterprise Linux BaseOS (v. 8)
  • Red Hat Enterprise Linux CRB (v. 8)
  • bpftool-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux CRB (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux CRB (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • bpftool-debuginfo-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux CRB (v. 8)
  • kernel-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-553.156.1.el8_10.src as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-abi-stablelists-0:4.18.0-553.156.1.el8_10.noarch as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-core-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-0:4.18.0-553.156.1.el8_10.x86_64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-553.156.1.el8_10.aarch64 as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-553.156.1.el8_10.ppc64le as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • kernel-debug-core-0:4.18.0-553.156.1.el8_10.s390x as a component of Red Hat Enterprise Linux BaseOS (v. 8)
  • +92 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 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 vulnerability, prevent the `bcm` kernel module from loading if it is not required. Create a file named `/etc/modprobe.d/blacklist-bcm.conf` with the content `blacklist bcm`. A system reboot is required for this change to take effect. This mitigation may impact functionality that relies on the CAN BCM module. Workaround: To mitigate this issue, prevent the `amdkfd` kernel module from loading if it is not required. This can be achieved by blacklisting the module. 1. Create a new file `/etc/modprobe.d/blacklist-amdkfd.conf` with the following content: `blacklist amdkfd` 2. Regenerate the initramfs to ensure the blacklist is applied during boot: `sudo dracut -f -v` (for RHEL 8/9) `sudo mkinitrd -f -v /boot/initramfs-$(uname -r).img $(uname -r)` (for RHEL 7) 3. Reboot the system for the changes to take effect. Note: Blacklisting the `amdkfd` module may impact functionality that relies on the AMD KFD driver, such as certain AMD GPU compute features. Evaluate the necessity of this module before applying the mitigation. Workaround: To mitigate this issue, prevent module ccp-crypto from being loaded. Please see https://access.redhat.com/solutions/41278 for how to blacklist a kernel module to prevent it from loading automatically.

🔗 References (13)