CVE-2024-50043: nfsd: fix possible badness in FREE_STATEID
First published: Mon Oct 21 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.9<6.11.4 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
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Reference Links
- https://git.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039
- https://git.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-50043
- https://nvd.nist.gov/vuln/detail/CVE-2024-50043
- https://launchpad.net/bugs/cve/CVE-2024-50043
- https://security-tracker.debian.org/tracker/CVE-2024-50043
- https://ubuntu.com/security/CVE-2024-50043
- https://git.kernel.org/linus/c88c150a467fcb670a1608e2272beeee3e86df6e
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