CVE-2025-21893 DetailDescriptionIn 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. Metrics
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CVSS 4.0 Severity and Vector Strings:
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Denotes Vulnerable Software Quick InfoCVE Dictionary Entry:CVE-2025-21893 NVD Published Date: 03/31/2025 NVD Last Modified: 04/08/2025 Source: kernel.org |
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