Database/Control plane, storage & DevOps
Linux NFS server (nfsd, laundromat vs free_stateid race): A race between the delegation laundromat and a client-issued
Impact
A race between the delegation laundromat and a client-issued FREE_STATEID gives a use-after-free in nfsd. A tenant that can time FREE_STATEID against delegation expiry crashes the file server, and a UAF of this shape is a plausible escalation primitive on the storage node.
Who can reach it
Any NFSv4 client that can reach the server and hold a delegation - so any tenant compute node with the export mounted.
What to do
Update the storage server kernel to one carrying the fix and reboot. Disabling delegations (echo 0 > /proc/fs/nfsd/... or the leasetime knob) narrows the window but is not a fix.
References
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This entry is curated: imported from vendor advisories with machine assistance, not yet individually verified. Confirm against your vendor's advisory before acting, and report anything wrong.