gfs2: Fix slab-use-after-free in qd_put
CVE-2026-45861 · published 27 May 2026
How serious is it
- Severity: high, CVSS score 7.8 out of 10.
- No exploit prediction (EPSS) score yet.
- Not on the CISA list of exploited vulnerabilities.
- No public exploit in Exploit-DB.
Is your app affected by CVE-2026-45861?
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Who is affected
- Linux Linux: a475c5dd16e57c570113eccba51955b5df8bb052 to < 53aaf083de197946b25bc4ffa3068d37366ce73d, a475c5dd16e57c570113eccba51955b5df8bb052 to < ca7c67bdd293089b3483f18886d6b2d0037d2ad9, a475c5dd16e57c570113eccba51955b5df8bb052 to < 1d47922b98046b8070a77347fb883a6523792803, a475c5dd16e57c570113eccba51955b5df8bb052 to < 80fff26d7a0c3926b511661c27eecc811a420eef
- Linux Linux: 6.6
How to check
- Find out whether you run the affected product and which version, then compare it with the versions above.
How to fix
Copies a prompt for Claude Code, Cursor or Codex that asks it to check whether you run this product.
- Apply the vendor's update or mitigation from the references below. If there is none yet, limit exposure of the affected service until there is.
- If a vulnerable version was live, check your logs and rotate the secrets that server could read.
The advisory
In the Linux kernel, the following vulnerability has been resolved:
gfs2: Fix slab-use-after-free in qd_put
Commit a475c5dd16e5 ("gfs2: Free quota data objects synchronously")
started freeing quota data objects during filesystem shutdown instead of
putting them back onto the LRU list, but it failed to remove these
objects from the LRU list, causing LRU list corruption. This caused
use-after-free when the shrinker (gfs2_qd_shrink_scan) tried to access
already-freed objects on the LRU list.
Fix this by removing qd objects from the LRU list before freeing them in
qd_put().
Initial fix from Deepanshu Kartikey <kartikey406@gmail.com>.
Check your whole app
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References
- git.kernel.org/stable/c/53aaf083de197946b25bc4ffa3068d37366ce73d
- git.kernel.org/stable/c/ca7c67bdd293089b3483f18886d6b2d0037d2ad9
- git.kernel.org/stable/c/1d47922b98046b8070a77347fb883a6523792803
- git.kernel.org/stable/c/80fff26d7a0c3926b511661c27eecc811a420eef
- git.kernel.org/stable/c/22150a7d401d9e9169b9b68e05bed95f7f49bf69
Merged from CVE List. Last updated 25 Oct 2026. All vulnerabilities · RSS · JSON