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CVE-2024-50043: nfsd: fix possible badness in FREE_STATEID

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-10-21 · updated 2026-10-21
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix possible badness in FREE_STATEID When multiple FREE_STATEIDs are sent for the same delegation stateid, it can lead to a possible either use-after-free or counter refcount underflow errors. In nfsd4_free_stateid() under the client lock we find a delegation stateid, however the code drops the lock before calling nfs4_put_stid(), that allows another FREE_STATE to find the stateid again. The first one will proceed to then free the stateid which leads to either use-after-free or decrementing already zeroed counter.

Affected products

• Linux kernel: from 6.9 before 6.11.4; 6.12-rc1, 6.12-rc2 — fixed in 6.11.4

How to fix

Upgrade to a fixed version: Linux kernel 6.11.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039
• https://git.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e

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