CVE-2024-53143

Aliases:DEBIAN-CVE-2024-53143
Advisory lineage Upstream: 0 Downstream: 4
Analyzed
Published: 07 Dec 2024, 06:40
Last modified:05 Aug 2026, 11:44

Vulnerability Summary

Overall Risk (default)
medium
31/100
CVSS Score
7.8 HIGH
v3.1 (cve.org)
EPSS Score
0.21% LOW
0% probability +0.16%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

07 Dec 2024, 06:40
Published
Vulnerability first disclosed
05 Aug 2026, 11:44
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: fsnotify: Fix ordering of iput() and watched_objects decrement Ensure the superblock is kept alive until we're done with iput(). Holding a reference to an inode is not allowed unless we ensure the superblock stays alive, which fsnotify does by keeping the watched_objects count elevated, so iput() must happen before the watched_objects decrement. This can lead to a UAF of something like sb->s_fs_info in tmpfs, but the UAF is hard to hit because race orderings that oops are more likely, thanks to the CHECK_DATA_CORRUPTION() block in generic_shutdown_super(). Also, ensure that fsnotify_put_sb_watched_objects() doesn't call fsnotify_sb_watched_objects() on a superblock that may have already been freed, which would cause a UAF read of sb->s_fsnotify_info.

CVSS Metrics

  • v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.21%• Percentile: 12%

Techniques & Countermeasures

  • CWE-416•Use After Free

    The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected Systems

  • debian•linux

    < 6.12.3-1 | < 6.12.3-1

  • linux•linux

    ≥ d2f277e26f521ccf6fb438463b41dba6123caabe, < 45a8f8232a495221ed058191629f5c628f21601a | ≥ d2f277e26f521ccf6fb438463b41dba6123caabe, < 83af1cfa10d9aafdabd06b3655e07727f373b434 | ≥ d2f277e26f521ccf6fb438463b41dba6123caabe, < 21d1b618b6b9da46c5116c640ac4b1cc8d40d63a | 6.10

  • linux•linux_kernel

    ≥ 6.10, < 6.11.11 | ≥ 6.12, < 6.12.2

References (5)