CVE-2026-43277

A flaw was found in the Linux kernel's ACPI Platform Error Interface (APEI) Generic Hardware Error Source (GHES) subsystem. A malicious firmware could send error data that is larger than the memory allocated by the kernel. This out-of-bounds write can lead to a kernel panic, effectively causing a Denial of Service (DoS) on the affected system.

Red Hat acknowledges the upstream Linux kernel correction for «APEI/GHES» as described in COMMENT_ZERO. Fixes are delivered through standard kernel errata for supported products. Operational exposure depends on whether this subsystem or driver is active in your configuration.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.