Description

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!

Classification

CVE ID: CVE-2024-43828

CVSS Base Severity: MEDIUM

CVSS Base Score: 5.5

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

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 12.94% (scored less or equal to compared to others)

EPSS Date: 2025-06-02 (when was this score calculated)

Stakeholder-Specific Vulnerability Categorization (SSVC)

SSVC Exploitation: none

SSVC Technical Impact: partial

SSVC Automatable: false

References

https://nvd.nist.gov/vuln/detail/CVE-2024-43828
https://git.kernel.org/stable/c/5ed0496e383cb6de120e56991385dce70bbb87c1
https://git.kernel.org/stable/c/0619f7750f2b178a1309808832ab20d85e0ad121
https://git.kernel.org/stable/c/181e63cd595c688194e07332f9944b3a63193de2
https://git.kernel.org/stable/c/c6e67df64783e99a657ef2b8c834ba2bf54c539c
https://git.kernel.org/stable/c/81f819c537d29932e4b9267f02411cbc8b355178
https://git.kernel.org/stable/c/907c3fe532253a6ef4eb9c4d67efb71fab58c706

Timeline