CVE-2026-46040 (GCVE-0-2026-46040)
Vulnerability from cvelistv5
Published
2026-05-27 12:56
Modified
2026-06-14 17:49
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: inotify: fix watch count leak when fsnotify_add_inode_mark_locked() fails When fsnotify_add_inode_mark_locked() fails in inotify_new_watch(), the error path calls inotify_remove_from_idr() but does not call dec_inotify_watches() to undo the preceding inc_inotify_watches(). This leaks a watch count, and repeated failures can exhaust the max_user_watches limit with -ENOSPC even when no watches are active. Prior to commit 1cce1eea0aff ("inotify: Convert to using per-namespace limits"), the watch count was incremented after fsnotify_add_mark_locked() succeeded, so this path was not affected. The conversion moved inc_inotify_watches() before the mark insertion without adding the corresponding rollback. Add the missing dec_inotify_watches() call in the error path.
Impacted products
Vendor Product Version
Linux Linux Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
Version: 1cce1eea0aff51201753fcaca421df825b0813b6
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{
  "containers": {
    "cna": {
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          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/notify/inotify/inotify_user.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "version": "4.11"
            },
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              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.258",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "5.15.209",
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            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.175",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.6.140",
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              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.86",
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            },
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              "status": "unaffected",
              "version": "6.18.27",
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              "status": "unaffected",
              "version": "7.0.4",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "vulnerable": true
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                }
              ],
              "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": "2026-06-14T17:49:57.876Z",
        "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": "2026-06-14T17:49:57.876Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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