{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-52990", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-06-09T07:44:35.376Z", "datePublished": "2026-06-24T16:29:04.148Z", "dateUpdated": "2026-06-24T16:29:04.148Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-06-24T16:29:04.148Z" }, "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)." } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/notify/mark.c" ], "versions": [ { "version": "c3638b5b13740fa31762d414bbce8b7a694e582a", "lessThan": "8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42", "status": "affected", "versionType": "git" }, { "version": "c3638b5b13740fa31762d414bbce8b7a694e582a", "lessThan": "b740cc86816bbc87902ae9db74cd21abde3c8d63", "status": "affected", "versionType": "git" }, { "version": "c3638b5b13740fa31762d414bbce8b7a694e582a", "lessThan": "5c80289503da3658e3df80280598c68d181eadbd", "status": "affected", "versionType": "git" }, { "version": "c3638b5b13740fa31762d414bbce8b7a694e582a", "lessThan": "4aca914ac152f5d055ddcb36704d1e539ac08977", "status": "affected", "versionType": "git" }, { "version": "ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe", "status": "affected", "versionType": "git" }, { "version": "4f145b67c075324b13d6ae7d5abb6e7a1dbac26d", "status": "affected", "versionType": "git" }, { "version": "5.10.220", "lessThan": "5.11", "status": "affected", "versionType": "semver" }, { "version": "5.15.154", "lessThan": "5.16", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "fs/notify/mark.c" ], "versions": [ { "version": "5.19", "status": "affected" }, { "version": "0", "lessThan": "5.19", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.91", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.33", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0.10", "lessThanOrEqual": "7.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.12.91" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "6.18.33" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.0.10" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.19", "versionEndExcluding": "7.1" }, { "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" } ] } ] } ], "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" } } } }