CVE-2026-89682

CVE CVE-2026-89682EUVD EUVD-2026-76594Published 2026-09-11T19:46:04.000ZLast changed 2026-09-13T06:33:06.000ZCVSS 8.1

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 3bc94fb44f10ef852723e1aeaac6794c5ab16aec; patch: 7.3-rc1; 5.15.154 <5.16; 1463b38e7cf34d4cc60f41daff459ad807b2e408 <bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4; patch: 0; patch: 7.2.4; 1463b38e7cf34d4cc60f41daff459ad807b2e408 <cadc9036d5a8209f89e7026ddba7cfb1c716b03c; 1463b38e7cf34d4cc60f41daff459ad807b2e408 <ba0ee9e04b7a0356c28d5a2fe445db675d24e572; patch: 6.18.51; 5.17; 5.10.220 <5.11; e8f923e1e9fcc0832a12c8a2461792e5a9544c03

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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