{"api_version":"1","generated_at":"2026-10-01T05:18:57+00:00","cve":"CVE-2026-93212","urls":{"html":"https://cve.report/CVE-2026-93212","api":"https://cve.report/api/cve/CVE-2026-93212.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-93212","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-93212"},"summary":{"title":"nfsd: guard nfsd_serv deref in nfsd_file_net_dispose","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().","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-24 16:17:16","updated_at":"2026-09-24 16:17:16"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014","name":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432","name":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb","name":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6","name":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-93212","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93212","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffb402596147ac583f3464ff5c48feb9423e3838 f4776c1c4b38fbc459420321c8ece87d0f7f95fb git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffb402596147ac583f3464ff5c48feb9423e3838 59baf45a06435194005fc5fa9a42d89f77a30432 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffb402596147ac583f3464ff5c48feb9423e3838 766170b4fd2daaf5c4d6735560101474e18edab6 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffb402596147ac583f3464ff5c48feb9423e3838 9f1ddfc8cb9076592401a611eb3a44d36186d014 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 6.9","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.9 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.109 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.50 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2.4 7.2.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.3-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":null,"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/nfsd/filecache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"f4776c1c4b38fbc459420321c8ece87d0f7f95fb","status":"affected","version":"ffb402596147ac583f3464ff5c48feb9423e3838","versionType":"git"},{"lessThan":"59baf45a06435194005fc5fa9a42d89f77a30432","status":"affected","version":"ffb402596147ac583f3464ff5c48feb9423e3838","versionType":"git"},{"lessThan":"766170b4fd2daaf5c4d6735560101474e18edab6","status":"affected","version":"ffb402596147ac583f3464ff5c48feb9423e3838","versionType":"git"},{"lessThan":"9f1ddfc8cb9076592401a611eb3a44d36186d014","status":"affected","version":"ffb402596147ac583f3464ff5c48feb9423e3838","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/nfsd/filecache.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"6.9"},{"lessThan":"6.9","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.109","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.50","versionType":"semver"},{"lessThanOrEqual":"7.2.*","status":"unaffected","version":"7.2.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.3-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.109","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.50","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"6.9","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"6.9","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"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()."}],"providerMetadata":{"dateUpdated":"2026-09-24T15:10:35.280Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/f4776c1c4b38fbc459420321c8ece87d0f7f95fb"},{"url":"https://git.kernel.org/stable/c/59baf45a06435194005fc5fa9a42d89f77a30432"},{"url":"https://git.kernel.org/stable/c/766170b4fd2daaf5c4d6735560101474e18edab6"},{"url":"https://git.kernel.org/stable/c/9f1ddfc8cb9076592401a611eb3a44d36186d014"}],"title":"nfsd: guard nfsd_serv deref in nfsd_file_net_dispose","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-93212","datePublished":"2026-09-24T15:10:35.280Z","dateReserved":"2026-09-17T16:02:15.093Z","dateUpdated":"2026-09-24T15:10:35.280Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-24 16:17:16","lastModifiedDate":"2026-09-24 16:17:16","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"93212","Ordinal":"1","Title":"nfsd: guard nfsd_serv deref in nfsd_file_net_dispose","CVE":"CVE-2026-93212","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"93212","Ordinal":"1","NoteData":"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().","Type":"Description","Title":"nfsd: guard nfsd_serv deref in nfsd_file_net_dispose"}]}}}