{"schema":"threatline.record/2","record":{"id":"CVE-2026-93212","aliases":[],"summary":"nfsd: guard nfsd_serv deref in nfsd_file_net_dispose","details":"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().","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","source_modified_at":"2026-10-19T09:07:24.291Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"ffb402596147ac583f3464ff5c48feb9423e3838","lessThan":"f4776c1c4b38fbc459420321c8ece87d0f7f95fb","status":"affected","versionType":"git"},{"version":"ffb402596147ac583f3464ff5c48feb9423e3838","lessThan":"59baf45a06435194005fc5fa9a42d89f77a30432","status":"affected","versionType":"git"},{"version":"ffb402596147ac583f3464ff5c48feb9423e3838","lessThan":"766170b4fd2daaf5c4d6735560101474e18edab6","status":"affected","versionType":"git"},{"version":"ffb402596147ac583f3464ff5c48feb9423e3838","lessThan":"9f1ddfc8cb9076592401a611eb3a44d36186d014","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","source_modified_at":"2026-10-19T09:07:24.291Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"6.9","status":"affected"},{"version":"0","lessThan":"6.9","status":"unaffected","versionType":"semver"},{"version":"6.12.109","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.50","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.4","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","source_modified_at":"2026-10-19T09:07:24.291Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"59baf45a06435194005fc5fa9a42d89f77a30432","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","source_modified_at":"2026-10-19T09:07:24.291Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"766170b4fd2daaf5c4d6735560101474e18edab6","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","source_modified_at":"2026-10-19T09:07:24.291Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"9f1ddfc8cb9076592401a611eb3a44d36186d014","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05731,"score_date":"2026-10-23"},"published_at":"2026-09-24T15:10:35.280Z","modified_at":"2026-10-19T09:07:24.291Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:07:24.291Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-93212","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:07:24.291Z","content_hash":"9f76c8fb15ca88f3a271f7def9721f579315937b397c4fbcd5073a37caeb55d6"}}