CVE-2024-43828: ext4: fix infinite loop when replaying fast_commit
First published: Sat Aug 17 2024(Updated: )
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!
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 | |
| Linux Kernel | >=5.10<5.10.224 | |
| Linux Kernel | >=5.11<5.15.165 | |
| Linux Kernel | >=5.16<6.1.103 | |
| Linux Kernel | >=6.2<6.6.44 | |
| Linux Kernel | >=6.7<6.10.3 |
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Reference Links
- https://git.kernel.org/stable/c/0619f7750f2b178a1309808832ab20d85e0ad121
- https://git.kernel.org/stable/c/181e63cd595c688194e07332f9944b3a63193de2
- https://git.kernel.org/stable/c/5ed0496e383cb6de120e56991385dce70bbb87c1
- https://git.kernel.org/stable/c/81f819c537d29932e4b9267f02411cbc8b355178
- https://git.kernel.org/stable/c/907c3fe532253a6ef4eb9c4d67efb71fab58c706
- https://git.kernel.org/stable/c/c6e67df64783e99a657ef2b8c834ba2bf54c539c
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-43828
- https://nvd.nist.gov/vuln/detail/CVE-2024-43828
- https://launchpad.net/bugs/cve/CVE-2024-43828
- https://security-tracker.debian.org/tracker/CVE-2024-43828
- https://ubuntu.com/security/CVE-2024-43828
- https://git.kernel.org/linus/907c3fe532253a6ef4eb9c4d67efb71fab58c706
Frequently Asked Questions
What is the severity of CVE-2024-43828?
The severity of CVE-2024-43828 is classified as medium, as it can lead to an infinite loop during the fast_commit replay process.
How do I fix CVE-2024-43828?
To fix CVE-2024-43828, users should upgrade to the affected remediated versions of the Linux kernel as specified in the vulnerability report.
Which versions of the Linux kernel are affected by CVE-2024-43828?
CVE-2024-43828 affects Linux kernel versions up to 5.10.223-1, and various versions in the 5.11 to 6.6.x ranges.
What specific action is causing the CVE-2024-43828 vulnerability?
CVE-2024-43828 is caused by an infinite loop that occurs due to an uninitialized extent_status struct during the fast_commit replay process.
Are there any patches available for CVE-2024-43828?
Yes, patches for CVE-2024-43828 are included in specific updated versions of the Linux kernel that address the looping issue.
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