{"id":"CVE-2026-93212","title":"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 …","summary":"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 …","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ffb402596147ac583f3464ff5c48feb9423e3838 < f4776c1c4b38fbc459420321c8ece87d0f7f95fb","Linux >= ffb402596147ac583f3464ff5c48feb9423e3838 < 59baf45a06435194005fc5fa9a42d89f77a30432","Linux >= ffb402596147ac583f3464ff5c48feb9423e3838 < 766170b4fd2daaf5c4d6735560101474e18edab6","Linux >= ffb402596147ac583f3464ff5c48feb9423e3838 < 9f1ddfc8cb9076592401a611eb3a44d36186d014","Linux 6.9"],"published":"2026-09-24","updated":"2026-09-24","sourceUpdated":"2026-09-24T16:17:16.133","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93212","references":[{"url":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-24T15:45:56.671Z","epss":0.00168,"epssPercentile":0.05399,"slug":"CVE-2026-93212","body":"## Overview\n\nIn 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().\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}