RHSA-2026:55765 — Security Advisory

An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

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.