{"api_version":"1","generated_at":"2026-09-13T05:16:51+00:00","cve":"CVE-2026-89682","urls":{"html":"https://cve.report/CVE-2026-89682","api":"https://cve.report/api/cve/CVE-2026-89682.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-89682","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-89682"},"summary":{"title":"nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net\n\nnfsd_file_dispose_list_delayed() defers fput() to nfsd service threads\nvia a per-net freeme queue, preventing the shrinker and GC worker from\nbearing the cost of closing files (see ffb402596147).  However, the\nqueue lives in a separately-allocated struct nfsd_fcache_disposal that\nis freed by nfsd_free_fcache_disposal_net() during per-net teardown.\nThe global shrinker, laundrette, and fsnotify callbacks can still be\ninside nfsd_file_dispose_list_delayed() dereferencing that pointer,\ncausing a use-after-free.\n\nInline the spinlock and freeme list directly into struct nfsd_net (as\nfcache_dispose_lock and fcache_dispose_list), eliminating the separately\nallocated struct nfsd_fcache_disposal entirely.  These fields now have\nthe same lifetime as the net namespace itself, so there is no dangling\npointer to chase.\n\nnfsd_file_cache_start_net() now just initializes the inline fields and\ncannot fail due to allocation.  nfsd_file_cache_shutdown_net() drains\nthe inline list directly instead of freeing a separate struct.  The\nalloc/free helpers are removed.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-09-11 20:19:55","updated_at":"2026-09-11 20:19:55"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572","name":"https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c","name":"https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4","name":"https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89682","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89682","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1463b38e7cf34d4cc60f41daff459ad807b2e408 ba0ee9e04b7a0356c28d5a2fe445db675d24e572 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1463b38e7cf34d4cc60f41daff459ad807b2e408 cadc9036d5a8209f89e7026ddba7cfb1c716b03c git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1463b38e7cf34d4cc60f41daff459ad807b2e408 bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected e8f923e1e9fcc0832a12c8a2461792e5a9544c03 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 3bc94fb44f10ef852723e1aeaac6794c5ab16aec git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.10.220 5.11 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.15.154 5.16 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 5.17","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.17 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.51 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":{"cve_year":"2026","cve_id":"89682","cve":"CVE-2026-89682","epss":"0.001660000","percentile":"0.061350000","score_date":"2026-09-12","updated_at":"2026-09-13 00:08:17"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/nfsd/filecache.c","fs/nfsd/netns.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"ba0ee9e04b7a0356c28d5a2fe445db675d24e572","status":"affected","version":"1463b38e7cf34d4cc60f41daff459ad807b2e408","versionType":"git"},{"lessThan":"cadc9036d5a8209f89e7026ddba7cfb1c716b03c","status":"affected","version":"1463b38e7cf34d4cc60f41daff459ad807b2e408","versionType":"git"},{"lessThan":"bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4","status":"affected","version":"1463b38e7cf34d4cc60f41daff459ad807b2e408","versionType":"git"},{"status":"affected","version":"e8f923e1e9fcc0832a12c8a2461792e5a9544c03","versionType":"git"},{"status":"affected","version":"3bc94fb44f10ef852723e1aeaac6794c5ab16aec","versionType":"git"},{"lessThan":"5.11","status":"affected","version":"5.10.220","versionType":"semver"},{"lessThan":"5.16","status":"affected","version":"5.15.154","versionType":"semver"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/nfsd/filecache.c","fs/nfsd/netns.h"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.17"},{"lessThan":"5.17","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.51","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":"6.18.51","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.2.4","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.3-rc1","versionStartIncluding":"5.17","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.10.220","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15.154","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net\n\nnfsd_file_dispose_list_delayed() defers fput() to nfsd service threads\nvia a per-net freeme queue, preventing the shrinker and GC worker from\nbearing the cost of closing files (see ffb402596147).  However, the\nqueue lives in a separately-allocated struct nfsd_fcache_disposal that\nis freed by nfsd_free_fcache_disposal_net() during per-net teardown.\nThe global shrinker, laundrette, and fsnotify callbacks can still be\ninside nfsd_file_dispose_list_delayed() dereferencing that pointer,\ncausing a use-after-free.\n\nInline the spinlock and freeme list directly into struct nfsd_net (as\nfcache_dispose_lock and fcache_dispose_list), eliminating the separately\nallocated struct nfsd_fcache_disposal entirely.  These fields now have\nthe same lifetime as the net namespace itself, so there is no dangling\npointer to chase.\n\nnfsd_file_cache_start_net() now just initializes the inline fields and\ncannot fail due to allocation.  nfsd_file_cache_shutdown_net() drains\nthe inline list directly instead of freeing a separate struct.  The\nalloc/free helpers are removed."}],"providerMetadata":{"dateUpdated":"2026-09-11T19:46:04.882Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/ba0ee9e04b7a0356c28d5a2fe445db675d24e572"},{"url":"https://git.kernel.org/stable/c/cadc9036d5a8209f89e7026ddba7cfb1c716b03c"},{"url":"https://git.kernel.org/stable/c/bbf13732f74351d21c5e0e8dd9bd8e1c48dc35d4"}],"title":"nfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-89682","datePublished":"2026-09-11T19:46:04.882Z","dateReserved":"2026-09-11T19:38:34.748Z","dateUpdated":"2026-09-11T19:46:04.882Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-11 20:19:55","lastModifiedDate":"2026-09-11 20:19:55","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"89682","Ordinal":"1","Title":"nfsd: fix fcache_disposal UAF by inlining dispose state into nfs","CVE":"CVE-2026-89682","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"89682","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: fix fcache_disposal UAF by inlining dispose state into nfsd_net\n\nnfsd_file_dispose_list_delayed() defers fput() to nfsd service threads\nvia a per-net freeme queue, preventing the shrinker and GC worker from\nbearing the cost of closing files (see ffb402596147).  However, the\nqueue lives in a separately-allocated struct nfsd_fcache_disposal that\nis freed by nfsd_free_fcache_disposal_net() during per-net teardown.\nThe global shrinker, laundrette, and fsnotify callbacks can still be\ninside nfsd_file_dispose_list_delayed() dereferencing that pointer,\ncausing a use-after-free.\n\nInline the spinlock and freeme list directly into struct nfsd_net (as\nfcache_dispose_lock and fcache_dispose_list), eliminating the separately\nallocated struct nfsd_fcache_disposal entirely.  These fields now have\nthe same lifetime as the net namespace itself, so there is no dangling\npointer to chase.\n\nnfsd_file_cache_start_net() now just initializes the inline fields and\ncannot fail due to allocation.  nfsd_file_cache_shutdown_net() drains\nthe inline list directly instead of freeing a separate struct.  The\nalloc/free helpers are removed.","Type":"Description","Title":"nfsd: fix fcache_disposal UAF by inlining dispose state into nfs"}]}}}