CVE-2025-40230

A flaw was found in the Linux kernel’s memory managementcode that handles Transparent Huge Pages. When a THP marked as poisoned due to a machine check exception needs to be split, the kernel could access the poisoned page during zeropage identification in the split logic. This improper handling causes a second in-kernel machine check, leading to an unexpected kernel panic rather than terminating the offending process.

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.

Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.