Answer in brief
CVE-2026-89692 records a Unknown severity 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.
A CVSS score is not reported in the current record. 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
Sep 11, 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.