CVE Alert: CVE-2025-21893
Vulnerability Summary: CVE-2025-21893
In the Linux kernel, the following vulnerability has been resolved: keys: Fix UAF in key_put() Once a key’s reference count has been reduced to 0, the garbage collector thread may destroy it at any time and so key_put() is not allowed to touch the key after that point. The most key_put() is normally allowed to do is to touch key_gc_work as that’s a static global variable. However, in an effort to speed up the reclamation of quota, this is now done in key_put() once the key’s usage is reduced to 0 – but now the code is looking at the key after the deadline, which is forbidden. Fix this by using a flag to indicate that a key can be gc’d now rather than looking at the key’s refcount in the garbage collector.
Affected Endpoints:
No affected endpoints listed.
Published Date:
3/31/2025, 8:15:14 PM
🔥 CVSS Score:
Exploit Status:
Not ExploitedReferences:
- https://git.kernel.org/stable/c/6afe2ea2daec156bd94ad2c5a6f4f4c48240dcd3
- https://git.kernel.org/stable/c/75845c6c1a64483e9985302793dbf0dfa5f71e32
- https://git.kernel.org/stable/c/f6a3cf833188e897c97028cd7b926e3f2cb1a8c0
Recommended Action:
No proposed action available. Please refer to vendor documentation for updates.
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