CVE-2025-40167

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains a flaw in the ext4 filesystem handling. Specifically, an invalid combination of the INLINE DATA and EXTENTS flags within an inode can lead to a BUG ON condition in the ext4 es cache extent() function when opening a verity file on a corrupted ext4 filesystem without a journal. This occurs because the presence of both flags bypasses extent tree validation in ext4 iget(), resulting in out-of-order extents and an integer underflow during hole size calculation. The issue was identified by syzbot.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.