CVE-2026-43171

A flaw was found in the Linux kernel's EFI/CPER component. This vulnerability occurs because the cper_print_fw_err() function does not adequately validate the length of error records against a provided offset. A malicious or malformed firmware could exploit this by providing an offset that causes an integer underflow, leading to the dumping of large memory regions. This can result in sensitive data disclosure or a system crash (Denial of Service).

Red Hat acknowledges the upstream Linux kernel correction for «EFI/CPER» 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.