CVE-2024-43828

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.6.50

Description The issue occurs due to an uninitialized extent status struct when doing fast commit replay, causing an infinite loop. The ext4 ext determine insert hole() function does not detect the replay and calls ext4 es find extent range(), which returns immediately without initializing the es variable. As a result, es contains garbage, leading to a potential integer overflow and infinite loop in the function. This can be easily reproduced using fstest generic/039. The problem is fixed by unconditionally initializing the structure in the ext4 es find extent range() function.

Recommendations Update to Linux kernel version 6.6.50 or later to resolve the issue. As a temporary workaround, consider restricting access to the ext4 es find extent range() function until a patch is available.