Answer in brief
CVE-2026-89692 records a High severity (CVSS 7.5) vulnerability in nfsd: clear CALLBACK_RUNNING on failed delegation recall queue. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1054e8ffc5c492f341bdf1888b882f1d163dd3d8 <b137930ee52e3ef38915a3511d4c070463b63a32 || >=1054e8ffc5c492f341bdf1888b882f1d163dd3d8 <cb2d0c4d1b3d301d042ed61365eaa8cb0141a254 || >=1054e8ffc5c492f341bdf1888b882f1d163dd3d8 <b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96 | b137930ee52e3ef38915a3511d4c070463b63a32, cb2d0c4d1b3d301d042ed61365eaa8cb0141a254, b036727d334b1b7cd4c1f1fba3b59ba93a6bbe96 |
| Linux/Linuxgeneric | 6.15 | Not reported |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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.
Quoted source text, attributed separately from HOL analysis.