{"api_version":"1","generated_at":"2026-06-02T18:12:32+00:00","cve":"CVE-2026-46040","urls":{"html":"https://cve.report/CVE-2026-46040","api":"https://cve.report/api/cve/CVE-2026-46040.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-46040","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-46040"},"summary":{"title":"inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ninotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails\n\nWhen fsnotify_add_inode_mark_locked() fails in inotify_new_watch(),\nthe error path calls inotify_remove_from_idr() but does not call\ndec_inotify_watches() to undo the preceding inc_inotify_watches().\nThis leaks a watch count, and repeated failures can exhaust the\nmax_user_watches limit with -ENOSPC even when no watches are active.\n\nPrior to commit 1cce1eea0aff (\"inotify: Convert to using per-namespace\nlimits\"), the watch count was incremented after fsnotify_add_mark_locked()\nsucceeded, so this path was not affected. The conversion moved\ninc_inotify_watches() before the mark insertion without adding the\ncorresponding rollback.\n\nAdd the missing dec_inotify_watches() call in the error path.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-05-27 14:17:23","updated_at":"2026-06-01 17:17:20"},"problem_types":[],"metrics":[],"references":[{"url":"https://git.kernel.org/stable/c/8bcc1cd237ab5ccfdd102869fa031c541943cf40","name":"https://git.kernel.org/stable/c/8bcc1cd237ab5ccfdd102869fa031c541943cf40","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/10edf7e0ffdc7faa18e2244b17722c1b882b8273","name":"https://git.kernel.org/stable/c/10edf7e0ffdc7faa18e2244b17722c1b882b8273","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3ad9ccea1b25435f6179b57aa891960beb7ce8f9","name":"https://git.kernel.org/stable/c/3ad9ccea1b25435f6179b57aa891960beb7ce8f9","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/6a320935fa4293e9e599ec9f85dc9eb3be7029f8","name":"https://git.kernel.org/stable/c/6a320935fa4293e9e599ec9f85dc9eb3be7029f8","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/73ddc8518a32baff6bc17afda4ee1ebae5b4ed12","name":"https://git.kernel.org/stable/c/73ddc8518a32baff6bc17afda4ee1ebae5b4ed12","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/9e48844f708eb48bae4e79cb21edc097c966306d","name":"https://git.kernel.org/stable/c/9e48844f708eb48bae4e79cb21edc097c966306d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/fdaa42ca370d056428e5e171247c8fdce8dff36a","name":"https://git.kernel.org/stable/c/fdaa42ca370d056428e5e171247c8fdce8dff36a","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/3ab58cf42c46bf2366d2f55ae5c59299d5e178b7","name":"https://git.kernel.org/stable/c/3ab58cf42c46bf2366d2f55ae5c59299d5e178b7","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-46040","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-46040","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cce1eea0aff51201753fcaca421df825b0813b6 3ab58cf42c46bf2366d2f55ae5c59299d5e178b7 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cce1eea0aff51201753fcaca421df825b0813b6 10edf7e0ffdc7faa18e2244b17722c1b882b8273 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cce1eea0aff51201753fcaca421df825b0813b6 3ad9ccea1b25435f6179b57aa891960beb7ce8f9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 1cce1eea0aff51201753fcaca421df825b0813b6 8bcc1cd237ab5ccfdd102869fa031c541943cf40 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.209 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.175 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.140 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.86 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.27 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.0.4 7.0.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1-rc1 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"46040","cve":"CVE-2026-46040","epss":"0.000180000","percentile":"0.050770000","score_date":"2026-06-01","updated_at":"2026-06-02 00:05:19"},"legacy_qids":[]},"source_records":{"cve_program":{"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Linux","programFiles":["fs/notify/inotify/inotify_user.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"lessThan":"3ab58cf42c46bf2366d2f55ae5c59299d5e178b7","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"10edf7e0ffdc7faa18e2244b17722c1b882b8273","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"3ad9ccea1b25435f6179b57aa891960beb7ce8f9","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"8bcc1cd237ab5ccfdd102869fa031c541943cf40","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"73ddc8518a32baff6bc17afda4ee1ebae5b4ed12","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"fdaa42ca370d056428e5e171247c8fdce8dff36a","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"9e48844f708eb48bae4e79cb21edc097c966306d","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"},{"lessThan":"6a320935fa4293e9e599ec9f85dc9eb3be7029f8","status":"affected","version":"1cce1eea0aff51201753fcaca421df825b0813b6","versionType":"git"}]},{"defaultStatus":"affected","product":"Linux","programFiles":["fs/notify/inotify/inotify_user.c"],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","vendor":"Linux","versions":[{"status":"affected","version":"4.11"},{"lessThan":"4.11","status":"unaffected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.10.*","status":"unaffected","version":"5.10.258","versionType":"semver"},{"lessThanOrEqual":"5.15.*","status":"unaffected","version":"5.15.209","versionType":"semver"},{"lessThanOrEqual":"6.1.*","status":"unaffected","version":"6.1.175","versionType":"semver"},{"lessThanOrEqual":"6.6.*","status":"unaffected","version":"6.6.140","versionType":"semver"},{"lessThanOrEqual":"6.12.*","status":"unaffected","version":"6.12.86","versionType":"semver"},{"lessThanOrEqual":"6.18.*","status":"unaffected","version":"6.18.27","versionType":"semver"},{"lessThanOrEqual":"7.0.*","status":"unaffected","version":"7.0.4","versionType":"semver"},{"lessThanOrEqual":"*","status":"unaffected","version":"7.1-rc1","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"cpeMatch":[{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.10.258","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"5.15.209","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.1.175","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.6.140","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.12.86","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"6.18.27","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.0.4","versionStartIncluding":"4.11","vulnerable":true},{"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionEndExcluding":"7.1-rc1","versionStartIncluding":"4.11","vulnerable":true}],"negate":false,"operator":"OR"}]}],"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ninotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails\n\nWhen fsnotify_add_inode_mark_locked() fails in inotify_new_watch(),\nthe error path calls inotify_remove_from_idr() but does not call\ndec_inotify_watches() to undo the preceding inc_inotify_watches().\nThis leaks a watch count, and repeated failures can exhaust the\nmax_user_watches limit with -ENOSPC even when no watches are active.\n\nPrior to commit 1cce1eea0aff (\"inotify: Convert to using per-namespace\nlimits\"), the watch count was incremented after fsnotify_add_mark_locked()\nsucceeded, so this path was not affected. The conversion moved\ninc_inotify_watches() before the mark insertion without adding the\ncorresponding rollback.\n\nAdd the missing dec_inotify_watches() call in the error path."}],"providerMetadata":{"dateUpdated":"2026-06-01T16:17:24.326Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/3ab58cf42c46bf2366d2f55ae5c59299d5e178b7"},{"url":"https://git.kernel.org/stable/c/10edf7e0ffdc7faa18e2244b17722c1b882b8273"},{"url":"https://git.kernel.org/stable/c/3ad9ccea1b25435f6179b57aa891960beb7ce8f9"},{"url":"https://git.kernel.org/stable/c/8bcc1cd237ab5ccfdd102869fa031c541943cf40"},{"url":"https://git.kernel.org/stable/c/73ddc8518a32baff6bc17afda4ee1ebae5b4ed12"},{"url":"https://git.kernel.org/stable/c/fdaa42ca370d056428e5e171247c8fdce8dff36a"},{"url":"https://git.kernel.org/stable/c/9e48844f708eb48bae4e79cb21edc097c966306d"},{"url":"https://git.kernel.org/stable/c/6a320935fa4293e9e599ec9f85dc9eb3be7029f8"}],"title":"inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","assignerShortName":"Linux","cveId":"CVE-2026-46040","datePublished":"2026-05-27T12:56:52.161Z","dateReserved":"2026-05-13T15:03:33.094Z","dateUpdated":"2026-06-01T16:17:24.326Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-27 14:17:23","lastModifiedDate":"2026-06-01 17:17:20","problem_types":[],"metrics":[],"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"46040","Ordinal":"1","Title":"inotify: fix watch count leak when fsnotify_add_inode_mark_locke","CVE":"CVE-2026-46040","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"46040","Ordinal":"1","NoteData":"In the Linux kernel, the following vulnerability has been resolved:\n\ninotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails\n\nWhen fsnotify_add_inode_mark_locked() fails in inotify_new_watch(),\nthe error path calls inotify_remove_from_idr() but does not call\ndec_inotify_watches() to undo the preceding inc_inotify_watches().\nThis leaks a watch count, and repeated failures can exhaust the\nmax_user_watches limit with -ENOSPC even when no watches are active.\n\nPrior to commit 1cce1eea0aff (\"inotify: Convert to using per-namespace\nlimits\"), the watch count was incremented after fsnotify_add_mark_locked()\nsucceeded, so this path was not affected. The conversion moved\ninc_inotify_watches() before the mark insertion without adding the\ncorresponding rollback.\n\nAdd the missing dec_inotify_watches() call in the error path.","Type":"Description","Title":"inotify: fix watch count leak when fsnotify_add_inode_mark_locke"}]}}}