by Kastro
Paper/Archive/CVE-2024-50043

CVE-2024-50043

Linux Linux — nfsd: fix possible badness in FREE_STATEID

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (CNA)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 42.6.426 × 208.5No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Linux3f29cc82a84c23cfd12b903029dd26002ca825f5 – < 7ca9e472ce5c67daa3188a348ece8c02a07650397ca9e472ce5c67daa3188a348ece8c02a0765039CNA
Linux3f29cc82a84c23cfd12b903029dd26002ca825f5 – < c88c150a467fcb670a1608e2272beeee3e86df6ec88c150a467fcb670a1608e2272beeee3e86df6eCNA
Linux172d038b7c4d3cfa9fc5ac210577c5c4f8256320–CNA
Linux6.6.160 – < 6.76.7CNA
Linux6.96.11.4CNA

Scores by source

Linux (CNA)9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgit.kernel.org/stable/c/7ca9e472ce5c67daa3188a348ece8c02a0765039refgit.kernel.org/stable/c/c88c150a467fcb670a1608e2272beeee3e86df6e