CVE-2024-43828

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: fix infinite loop when replaying fast_commit When doing fast_commit replay an infinite loop may occur due to an uninitialized extent_status struct. ext4_ext_determine_insert_hole() does not detect the replay and calls ext4_es_find_extent_range(), which will return immediately without initializing the 'es' variable. Because 'es' contains garbage, an integer overflow may happen causing an infinite loop in this function, easily reproducible using fstest generic/039. This commit fixes this issue by unconditionally initializing the structure in function ext4_es_find_extent_range(). Thanks to Zhang Yi, for figuring out the real problem!

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0619f7750f2b178a1309808832ab20d85e0ad121 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0619f7750f2b178a1309808832ab20d85e0ad121Patch
• https://git.kernel.org/stable/c/181e63cd595c688194e07332f9944b3a63193de2Patch
• https://git.kernel.org/stable/c/5ed0496e383cb6de120e56991385dce70bbb87c1Patch
• https://git.kernel.org/stable/c/81f819c537d29932e4b9267f02411cbc8b355178Patch
• https://git.kernel.org/stable/c/907c3fe532253a6ef4eb9c4d67efb71fab58c706Patch
• https://git.kernel.org/stable/c/c6e67df64783e99a657ef2b8c834ba2bf54c539cPatch
• https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html