RHSA-2026:55765: Important: kernel-rt security, bug fix, and enhancement update
Important: kernel-rt security, bug fix, and enhancement update
Other sources
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 objecterr() (CVE-2025-39902) kernel: drm/amdkfd: Fix out-of-bounds write in kfdeventpageset() (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 kreallocarray() in dalvectorreserve() (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 amdgpuhmmrangegetpages (CVE-2026-63879) kernel: drm/amd/display: Validate payload length and linkindex in dcprocessdmubauxtransferasync (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.
— Red Hat
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
redhat/kernel-rt-debugto a version that resolves this vulnerability.Fixed in 4.18.0-553.156.1.rt7.497.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-develto a version that resolves this vulnerability.Fixed in 4.18.0-553.156.1.rt7.497.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-debug-modules-extrato a version that resolves this vulnerability.Fixed in 4.18.0-553.156.1.rt7.497.el8_10 - Upgrade
Upgrade
redhat/kernel-rt-kvmto a version that resolves this vulnerability.Fixed in 4.18.0-553.156.1.rt7.497.el8_10 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch JIRA:RHEL-224556 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch JIRA:RHEL-189997 - Upgrade
Upgrade
kernel-rtto a version that resolves this vulnerability.Patch CVE-2025-39902 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-17523 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-53016 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-53136 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-53329 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-64219 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-63879 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-53374 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-43206 - Upgrade
Upgrade
kernel (incl. kernel-rt)to a version that resolves this vulnerability.Patch CVE-2026-63884 - Operational
Reboot the system after applying this kernel/kernel-rt security and bug fix update so the changes take effect.
Event History
Frequently Asked Questions
What is the severity of RHSA-2026:55765?
The severity of RHSA-2026:55765 is high, rated at 7.
What does RHSA-2026:55765 address?
RHSA-2026:55765 addresses important security, bug fixes, and enhancements related to the kernel-rt.
How do I fix RHSA-2026:55765?
To fix RHSA-2026:55765, update your Red Hat Enterprise Linux systems with the latest kernel-rt packages.
Which software is affected by RHSA-2026:55765?
RHSA-2026:55765 affects Red Hat Enterprise Linux for x86_64 - Extended Life Cycle, and Real Time versions for NFV and general use.
When was RHSA-2026:55765 published?
RHSA-2026:55765 was published on August 17, 2026.