RHSA-2026:55764 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: mm/slub: avoid accessing metadata when pointer is invalid in object_err() (CVE-2025-39902)

• kernel: drm/amdkfd: Fix out-of-bounds write in kfd_event_page_set() (CVE-2026-43206)

• kernel: crypto: ccp - copy IV using skcipher ivsize (CVE-2026-53016)

• kernel: drm/amd/display: Clamp VBIOS HDMI retimer register count to array size (CVE-2026-53136)

• kernel: drm/amd/display: Use krealloc_array() in dal_vector_reserve() (CVE-2026-53329)

• kernel: drm/amdgpu: zero-initialize GART table on allocation (CVE-2026-53374)

• kernel: drm/i915: Fix potential UAF in TTM object purge (CVE-2026-63884)

• kernel: drm/amdgpu: fix amdgpu_hmm_range_get_pages (CVE-2026-63879)

• kernel: drm/amd/display: Validate payload length and link_index in dc_process_dmub_aux_transfer_async (CVE-2026-64219)

• kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges (CVE-2026-17523)

Bug Fix(es) and Enhancement(s):

• Backport "sched/deadline: Fix bandwidth reclaim equation in GRUB" to RHEL 8.10 (JIRA:RHEL-189997)

• vhost: reset the vring metadata cache on vring reconfiguration [rhel-8.10.z] (JIRA:RHEL-224556)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.