{"id":"CVE-2026-93212","published":"2026-09-24T16:17:16.133","lastModified":"2026-09-24T16:17:16.133","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: guard nfsd_serv deref in nfsd_file_net_dispose\n\nnfsd_file_net_dispose() is the consumer side of l->freeme: the nfsd\nservice thread loop calls it to drain entries that the filecache\ngarbage collector and shrinker append via\nnfsd_file_dispose_list_delayed().  During per-net teardown,\nnn->nfsd_serv is cleared before the filecache laundrette is shut\ndown, so the service thread can still run a dispose pass that finds\nmore than eight entries on l->freeme and dereferences a NULL\nsvc_serv:\n\n    nfsd service thread loop\n      nfsd_file_net_dispose(nn)\n        if (!list_empty(&l->freeme)) {\n            ...\n            svc_wake_up(nn->nfsd_serv);   /* nn->nfsd_serv == NULL */\n        }\n\nThe sibling helper nfsd_file_dispose_list_delayed() already documents\nthis ordering and caches nn->nfsd_serv into a local before testing it\nfor NULL.  nfsd_file_net_dispose() was introduced with the same raw\nsvc_wake_up(nn->nfsd_serv) call and never picked up the guard.\n\nFix by loading nn->nfsd_serv into a local svc_serv pointer and only\ncalling svc_wake_up() when it is non-NULL, matching the pattern in\nnfsd_file_dispose_list_delayed().","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432","tags":[]},{"url":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6","tags":[]},{"url":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014","tags":[]},{"url":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}