RHSA-2026:65147 — Security Advisory
Red Hat Security Advisory: microcode_ctl security, bug fix, and enhancement update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · September 8, 2026
Updated · November 4, 2026
Topic
An update for microcode_ctl 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.
Description
The microcode_ctl packages provide microcode updates for Intel and AMD processors.
Security Fix(es):
-
kernel: hypervisor: Intel Processors: Privilege escalation in Ring 0 via improper value handling (CVE-2025-35973)
-
kernel: microcode_ctl: Intel Xeon 6 Processors: Privilege escalation via improper memory range handling in SMM (CVE-2025-31936)
Bug Fix(es) and Enhancement(s):
- [RHEL 8] Update Intel CPU microcode to the latest version (JIRA:RHEL-240770)
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.