CVE-2024-50043

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux3f29cc82a84c23cfd12b903029dd26002ca825f5 < 7ca9e472ce5c67daa3188a348ece8c02a0765039affected
LinuxLinux3f29cc82a84c23cfd12b903029dd26002ca825f5 < c88c150a467fcb670a1608e2272beeee3e86df6eaffected
LinuxLinux6.9affected
LinuxLinux0 < 6.9unaffected
LinuxLinux6.11.4 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References