Answer in brief
CVE-2026-89682 records a Unknown severity vulnerability in nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net. 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 | >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <ba0ee9e04b7a0356c28d5a2fe445db675d24e572 || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <cadc9036d5a8209f89e7026ddba7cfb1c716b03c || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4 || e8f923e1e9fcc0832a12c8a2461792e5a9544c03 || 3bc94fb44f10ef852723e1aeaac6794c5ab16aec || >=5.10.220 <5.11 || >=5.15.154 <5.16 | ba0ee9e04b7a0356c28d5a2fe445db675d24e572, cadc9036d5a8209f89e7026ddba7cfb1c716b03c, bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4, 5.11, 5.16 |
| Linux/Linuxgeneric | 5.17 | 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: fix fcache_disposal UAF by inlining dispose state into nfsd_net nfsd_file_dispose_list_delayed() defers fput() to nfsd service threads via a per-net freeme queue, preventing the shrinker and GC worker from bearing the cost of closing files (see ffb402596147). However, the queue lives in a separately-allocated struct nfsd_fcache_disposal that is freed by nfsd_free_fcache_disposal_net() during per-net teardown. The global shrinker, laundrette, and fsnotify callbacks can still be inside nfsd_file_dispose_list_delayed() dereferencing that pointer, causing a use-after-free. Inline the spinlock and freeme list directly into struct nfsd_net (as fcache_dispose_lock and fcache_dispose_list), eliminating the separately allocated struct nfsd_fcache_disposal entirely. These fields now have the same lifetime as the net namespace itself, so there is no dangling pointer to chase. nfsd_file_cache_start_net() now just initializes the inline fields and cannot fail due to allocation. nfsd_file_cache_shutdown_net() drains the inline list directly instead of freeing a separate struct. The alloc/free helpers are removed.
Quoted source text, attributed separately from HOL analysis.