CVE-2024-27389: pstore: inode: Only d_invalidate() is needed

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-05-01 · updated 2026-08-04
Weakness: CWE-415

Description

In the Linux kernel, the following vulnerability has been resolved: pstore: inode: Only d_invalidate() is needed Unloading a modular pstore backend with records in pstorefs would trigger the dput() double-drop warning: WARNING: CPU: 0 PID: 2569 at fs/dcache.c:762 dput.part.0+0x3f3/0x410 Using the combo of d_drop()/dput() (as mentioned in Documentation/filesystems/vfs.rst) isn't the right approach here, and leads to the reference counting problem seen above. Use d_invalidate() and update the code to not bother checking for error codes that can never happen. ---

Affected products

Linux kernel: from 5.8 before 6.1.83; from 6.2 before 6.6.23; from 6.7 before 6.7.11; from 6.8 before 6.8.2 — fixed in 6.1.83, 6.6.23, 6.7.11, 6.8.2

How to fix

Upgrade to a fixed version: Linux kernel 6.1.83, 6.6.23, 6.7.11, 6.8.2. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2024-27389 or the next vulnerability affects your stack