CVE-2024-53143

HIGH EPSS 10.9%
Published Dec 7, 20241y ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Dec 7, 2024 1y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
10.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 2

VendorProductVersionRange
linuxlinux_kernel*≥6.10  –  <6.11.11
linuxlinux_kernel*≥6.12  –  <6.12.2

References 4

  • git.kernel.org https://git.kernel.org/stable/c/21d1b618b6b9da46c5116c640ac4b1cc8d40d63a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/45a8f8232a495221ed058191629f5c628f21601a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83af1cfa10d9aafdabd06b3655e07727f373b434
    Patch
  • project-zero.issues.chromium.org https://project-zero.issues.chromium.org/issues/379667898
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/21d1b618b6b9da46c5116c640ac4b1cc8d40d63a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/45a8f8232a495221ed058191629f5c628f21601a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/83af1cfa10d9aafdabd06b3655e07727f373b434
    Patch
  • project-zero.issues.chromium.org https://project-zero.issues.chromium.org/issues/379667898
    Patch