Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: nfsd: clear CALLBACK_RUNNING on failed delegation recall queue nfsd_break_one_deleg() sets NFSD4_CALLBACK_RUNNING via test_and_set_bit at entry to serialize recall work, then calls nfsd4_run_cb() to queue the recall. When the queue attempt fails the refcount bump is undone, but the RUNNING bit is left set. The only site that clears the bit is nfsd41_destroy_cb() (fs/nfsd/nfs4callback.c), which runs from the workqueue and is therefore unreachable when nothing was queued. The bit becomes a permanent latch on dp->dl_recall.cb_flags: every subsequent break_lease() on the same delegation hits the early-return guard in nfsd_break_one_deleg() and silently skips the recall, so the delegation is never broken and the conflicting open or lock stalls. Fix by clearing NFSD4_CALLBACK_RUNNING on the !queued branch alongside the refcount_dec.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1054e8ffc5c492f341bdf1888b882f1d163dd3d8 before b137930ee52e3ef38915a3511d4c070463b63a32; affected 1054e8ffc5c492f341bdf1888b882f1d163dd3d8 before cb2d0c4d1b3d301d042ed61365eaa8cb0141a254; affected 1054e8ffc5c492f341bdf1888b882f1d163dd3d8 before b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96 |
| Linux / Linux | affected 6.15; unaffected 0 before 6.15; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.