{"api_version":"1","generated_at":"2026-06-26T03:58:50+00:00","cve":"CVE-2026-52990","urls":{"html":"https://cve.report/CVE-2026-52990","api":"https://cve.report/api/cve/CVE-2026-52990.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-52990","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-52990"},"summary":{"title":"fsnotify: fix inode reference leak in fsnotify_recalc_mask()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nfsnotify: fix inode reference leak in fsnotify_recalc_mask()\n\nfsnotify_recalc_mask() fails to handle the return value of\n__fsnotify_recalc_mask(), which may return an inode pointer that needs\nto be released via fsnotify_drop_object() when the connector's HAS_IREF\nflag transitions from set to cleared.\n\nThis manifests as a hung task with the following call trace:\n\n  INFO: task umount:1234 blocked for more than 120 seconds.\n  Call Trace:\n   __schedule\n   schedule\n   fsnotify_sb_delete\n   generic_shutdown_super\n   kill_anon_super\n   cleanup_mnt\n   task_work_run\n   do_exit\n   do_group_exit\n\nThe race window that triggers the iref leak:\n\n  Thread A (adding mark)              Thread B (removing mark)\n  ──────────────────────              ────────────────────────\n  fsnotify_add_mark_locked():\n    fsnotify_add_mark_list():\n      spin_lock(conn->lock)\n      add mark_B(evictable) to list\n      spin_unlock(conn->lock)\n    return\n\n    /* ---- gap: no lock held ---- */\n\n                                      fsnotify_detach_mark(mark_A):\n                                        spin_lock(mark_A->lock)\n                                        clear ATTACHED flag on mark_A\n                                        spin_unlock(mark_A->lock)\n                                        fsnotify_put_mark(mark_A)\n\n    fsnotify_recalc_mask():\n      spin_lock(conn->lock)\n      __fsnotify_recalc_mask():\n        /* mark_A skipped: ATTACHED cleared */\n        /* only mark_B(evictable) remains */\n        want_iref = false\n        has_iref = true  /* not yet cleared */\n        -> HAS_IREF transitions true -> false\n        -> returns inode pointer\n      spin_unlock(conn->lock)\n      /* BUG: return value discarded!\n       * iput() and fsnotify_put_sb_watched_objects()\n       * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).","state":"PUBLISHED","assigner":"Linux","published_at":"2026-06-24 17:17:09","updated_at":"2026-06-24 17:17:09"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/b740cc86816bbc87902ae9db74cd21abde3c8d63","name":"https://git.kernel.org/stable/c/b740cc86816bbc87902ae9db74cd21abde3c8d63","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/4aca914ac152f5d055ddcb36704d1e539ac08977","name":"https://git.kernel.org/stable/c/4aca914ac152f5d055ddcb36704d1e539ac08977","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42","name":"https://git.kernel.org/stable/c/8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/5c80289503da3658e3df80280598c68d181eadbd","name":"https://git.kernel.org/stable/c/5c80289503da3658e3df80280598c68d181eadbd","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-52990","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52990","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c3638b5b13740fa31762d414bbce8b7a694e582a 8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c3638b5b13740fa31762d414bbce8b7a694e582a b740cc86816bbc87902ae9db74cd21abde3c8d63 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c3638b5b13740fa31762d414bbce8b7a694e582a 5c80289503da3658e3df80280598c68d181eadbd git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected c3638b5b13740fa31762d414bbce8b7a694e582a 4aca914ac152f5d055ddcb36704d1e539ac08977 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 4f145b67c075324b13d6ae7d5abb6e7a1dbac26d 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 5.19","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.19 semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.91 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.33 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.10 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"52990","cve":"CVE-2026-52990","epss":"0.001750000","percentile":"0.072030000","score_date":"2026-06-25","updated_at":"2026-06-26 00:06:15"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/notify/mark.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42","status":"affected","version":"c3638b5b13740fa31762d414bbce8b7a694e582a","versionType":"git"},{"lessThan":"b740cc86816bbc87902ae9db74cd21abde3c8d63","status":"affected","version":"c3638b5b13740fa31762d414bbce8b7a694e582a","versionType":"git"},{"lessThan":"5c80289503da3658e3df80280598c68d181eadbd","status":"affected","version":"c3638b5b13740fa31762d414bbce8b7a694e582a","versionType":"git"},{"lessThan":"4aca914ac152f5d055ddcb36704d1e539ac08977","status":"affected","version":"c3638b5b13740fa31762d414bbce8b7a694e582a","versionType":"git"},{"status":"affected","version":"ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe","versionType":"git"},{"status":"affected","version":"4f145b67c075324b13d6ae7d5abb6e7a1dbac26d","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/notify/mark.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"5.19"},{"lessThan":"5.19","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.91","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.33","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.10","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.91","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.33","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.10","versionStartIncluding":"5.19","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1","versionStartIncluding":"5.19","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\nfsnotify: fix inode reference leak in fsnotify_recalc_mask()\n\nfsnotify_recalc_mask() fails to handle the return value of\n__fsnotify_recalc_mask(), which may return an inode pointer that needs\nto be released via fsnotify_drop_object() when the connector's HAS_IREF\nflag transitions from set to cleared.\n\nThis manifests as a hung task with the following call trace:\n\n  INFO: task umount:1234 blocked for more than 120 seconds.\n  Call Trace:\n   __schedule\n   schedule\n   fsnotify_sb_delete\n   generic_shutdown_super\n   kill_anon_super\n   cleanup_mnt\n   task_work_run\n   do_exit\n   do_group_exit\n\nThe race window that triggers the iref leak:\n\n  Thread A (adding mark)              Thread B (removing mark)\n  ──────────────────────              ────────────────────────\n  fsnotify_add_mark_locked():\n    fsnotify_add_mark_list():\n      spin_lock(conn->lock)\n      add mark_B(evictable) to list\n      spin_unlock(conn->lock)\n    return\n\n    /* ---- gap: no lock held ---- */\n\n                                      fsnotify_detach_mark(mark_A):\n                                        spin_lock(mark_A->lock)\n                                        clear ATTACHED flag on mark_A\n                                        spin_unlock(mark_A->lock)\n                                        fsnotify_put_mark(mark_A)\n\n    fsnotify_recalc_mask():\n      spin_lock(conn->lock)\n      __fsnotify_recalc_mask():\n        /* mark_A skipped: ATTACHED cleared */\n        /* only mark_B(evictable) remains */\n        want_iref = false\n        has_iref = true  /* not yet cleared */\n        -> HAS_IREF transitions true -> false\n        -> returns inode pointer\n      spin_unlock(conn->lock)\n      /* BUG: return value discarded!\n       * iput() and fsnotify_put_sb_watched_objects()\n       * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B)."}],"providerMetadata":{"dateUpdated":"2026-06-24T16:29:04.148Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42"},{"url":"https://git.kernel.org/stable/c/b740cc86816bbc87902ae9db74cd21abde3c8d63"},{"url":"https://git.kernel.org/stable/c/5c80289503da3658e3df80280598c68d181eadbd"},{"url":"https://git.kernel.org/stable/c/4aca914ac152f5d055ddcb36704d1e539ac08977"}],"title":"fsnotify: fix inode reference leak in fsnotify_recalc_mask()","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-52990","datePublished":"2026-06-24T16:29:04.148Z","dateReserved":"2026-06-09T07:44:35.376Z","dateUpdated":"2026-06-24T16:29:04.148Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-06-24 17:17:09","lastModifiedDate":"2026-06-24 17:17:09","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"52990","Ordinal":"1","Title":"fsnotify: fix inode reference leak in fsnotify_recalc_mask()","CVE":"CVE-2026-52990","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"52990","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\nfsnotify: fix inode reference leak in fsnotify_recalc_mask()\n\nfsnotify_recalc_mask() fails to handle the return value of\n__fsnotify_recalc_mask(), which may return an inode pointer that needs\nto be released via fsnotify_drop_object() when the connector's HAS_IREF\nflag transitions from set to cleared.\n\nThis manifests as a hung task with the following call trace:\n\n  INFO: task umount:1234 blocked for more than 120 seconds.\n  Call Trace:\n   __schedule\n   schedule\n   fsnotify_sb_delete\n   generic_shutdown_super\n   kill_anon_super\n   cleanup_mnt\n   task_work_run\n   do_exit\n   do_group_exit\n\nThe race window that triggers the iref leak:\n\n  Thread A (adding mark)              Thread B (removing mark)\n  ──────────────────────              ────────────────────────\n  fsnotify_add_mark_locked():\n    fsnotify_add_mark_list():\n      spin_lock(conn->lock)\n      add mark_B(evictable) to list\n      spin_unlock(conn->lock)\n    return\n\n    /* ---- gap: no lock held ---- */\n\n                                      fsnotify_detach_mark(mark_A):\n                                        spin_lock(mark_A->lock)\n                                        clear ATTACHED flag on mark_A\n                                        spin_unlock(mark_A->lock)\n                                        fsnotify_put_mark(mark_A)\n\n    fsnotify_recalc_mask():\n      spin_lock(conn->lock)\n      __fsnotify_recalc_mask():\n        /* mark_A skipped: ATTACHED cleared */\n        /* only mark_B(evictable) remains */\n        want_iref = false\n        has_iref = true  /* not yet cleared */\n        -> HAS_IREF transitions true -> false\n        -> returns inode pointer\n      spin_unlock(conn->lock)\n      /* BUG: return value discarded!\n       * iput() and fsnotify_put_sb_watched_objects()\n       * are never called */\n\nFix this by deferring the transition true -> false of HAS_IREF flag from\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).","Type":"Description","Title":"fsnotify: fix inode reference leak in fsnotify_recalc_mask()"}]}}}