Answer in brief
CVE-2026-89682 records a High severity (CVSS 8.1) 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), 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 8.1. 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), 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 |
| Linux/Linuxgeneric | >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <e6c3a43d0a41f03abae3764fc82a59369360c7e0 || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <9c8ac7c2b9b150e13b7ad0d0fae54f17747dce67 || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <ba0ee9e04b7a0356c28d5a2fe445db675d24e572 || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <cadc9036d5a8209f89e7026ddba7cfb1c716b03c || >=1463b38e7cf34d4cc60f41daff459ad807b2e408 <bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4 || e8f923e1e9fcc0832a12c8a2461792e5a9544c03 || 3bc94fb44f10ef852723e1aeaac6794c5ab16aec || >=5.10.220 <5.11 || >=5.15.154 <5.16 | e6c3a43d0a41f03abae3764fc82a59369360c7e0, 9c8ac7c2b9b150e13b7ad0d0fae54f17747dce67, ba0ee9e04b7a0356c28d5a2fe445db675d24e572, cadc9036d5a8209f89e7026ddba7cfb1c716b03c, bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4, 5.11, 5.16 |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 21, 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.