cve-2026-45899

CVE-2026-45899 is a Linux kernel vulnerability in the ext4 filesystem where a failed extent split can leave stale metadata in the extent status tree. This low-level storage defect can cause data integrity issues because the filesystem cache may report incorrect state. The fix ensures that when ext4 cannot complete an extent split, the kernel drops potentially stale cache entries instead of leaving bad state. While not a remote code execution threat, this bug is critical for administrators managing ext4-based storage, as it undermines the reliability of filesystem caching. Patches are available from kernel.org and should be applied promptly to prevent data corruption.