CVE-2026-52990 (GCVE-0-2026-52990)

Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-06-24 16:29
VLAI
Title
fsnotify: fix inode reference leak in fsnotify_recalc_mask()
Summary
In the Linux kernel, the following vulnerability has been resolved: fsnotify: fix inode reference leak in fsnotify_recalc_mask() fsnotify_recalc_mask() fails to handle the return value of __fsnotify_recalc_mask(), which may return an inode pointer that needs to be released via fsnotify_drop_object() when the connector's HAS_IREF flag transitions from set to cleared. This manifests as a hung task with the following call trace: INFO: task umount:1234 blocked for more than 120 seconds. Call Trace: __schedule schedule fsnotify_sb_delete generic_shutdown_super kill_anon_super cleanup_mnt task_work_run do_exit do_group_exit The race window that triggers the iref leak: Thread A (adding mark) Thread B (removing mark) ────────────────────── ──────────────────────── fsnotify_add_mark_locked(): fsnotify_add_mark_list(): spin_lock(conn->lock) add mark_B(evictable) to list spin_unlock(conn->lock) return /* ---- gap: no lock held ---- */ fsnotify_detach_mark(mark_A): spin_lock(mark_A->lock) clear ATTACHED flag on mark_A spin_unlock(mark_A->lock) fsnotify_put_mark(mark_A) fsnotify_recalc_mask(): spin_lock(conn->lock) __fsnotify_recalc_mask(): /* mark_A skipped: ATTACHED cleared */ /* only mark_B(evictable) remains */ want_iref = false has_iref = true /* not yet cleared */ -> HAS_IREF transitions true -> false -> returns inode pointer spin_unlock(conn->lock) /* BUG: return value discarded! * iput() and fsnotify_put_sb_watched_objects() * are never called */ Fix this by deferring the transition true -> false of HAS_IREF flag from fsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c3638b5b13740fa31762d414bbce8b7a694e582a , < 8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42 (git)
Affected: c3638b5b13740fa31762d414bbce8b7a694e582a , < b740cc86816bbc87902ae9db74cd21abde3c8d63 (git)
Affected: c3638b5b13740fa31762d414bbce8b7a694e582a , < 5c80289503da3658e3df80280598c68d181eadbd (git)
Affected: c3638b5b13740fa31762d414bbce8b7a694e582a , < 4aca914ac152f5d055ddcb36704d1e539ac08977 (git)
Affected: ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe (git)
Affected: 4f145b67c075324b13d6ae7d5abb6e7a1dbac26d (git)
Affected: 5.10.220 , < 5.11 (semver)
Affected: 5.15.154 , < 5.16 (semver)
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Linux Linux Affected: 5.19
Unaffected: 0 , < 5.19 (semver)
Unaffected: 6.12.91 , ≤ 6.12.* (semver)
Unaffected: 6.18.33 , ≤ 6.18.* (semver)
Unaffected: 7.0.10 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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{
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          "product": "Linux",
          "programFiles": [
            "fs/notify/mark.c"
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              "version": "6.18.33",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.0.10",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "7.1",
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      "cpeApplicability": [
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      "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\u0027s 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  \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500              \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\n  fsnotify_add_mark_locked():\n    fsnotify_add_mark_list():\n      spin_lock(conn-\u003elock)\n      add mark_B(evictable) to list\n      spin_unlock(conn-\u003elock)\n    return\n\n    /* ---- gap: no lock held ---- */\n\n                                      fsnotify_detach_mark(mark_A):\n                                        spin_lock(mark_A-\u003elock)\n                                        clear ATTACHED flag on mark_A\n                                        spin_unlock(mark_A-\u003elock)\n                                        fsnotify_put_mark(mark_A)\n\n    fsnotify_recalc_mask():\n      spin_lock(conn-\u003elock)\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        -\u003e HAS_IREF transitions true -\u003e false\n        -\u003e returns inode pointer\n      spin_unlock(conn-\u003elock)\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 -\u003e 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()",
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  "cveMetadata": {
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    "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",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-52990",
      "date": "2026-07-02",
      "epss": "0.00175",
      "percentile": "0.07231"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-52990\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-06-24T17:17:09.833\",\"lastModified\":\"2026-06-24T17:17:09.833\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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\u0027s 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  \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500              \u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\\n  fsnotify_add_mark_locked():\\n    fsnotify_add_mark_list():\\n      spin_lock(conn-\u003elock)\\n      add mark_B(evictable) to list\\n      spin_unlock(conn-\u003elock)\\n    return\\n\\n    /* ---- gap: no lock held ---- */\\n\\n                                      fsnotify_detach_mark(mark_A):\\n                                        spin_lock(mark_A-\u003elock)\\n                                        clear ATTACHED flag on mark_A\\n                                        spin_unlock(mark_A-\u003elock)\\n                                        fsnotify_put_mark(mark_A)\\n\\n    fsnotify_recalc_mask():\\n      spin_lock(conn-\u003elock)\\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        -\u003e HAS_IREF transitions true -\u003e false\\n        -\u003e returns inode pointer\\n      spin_unlock(conn-\u003elock)\\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 -\u003e false of HAS_IREF flag from\\nfsnotify_recalc_mask() (Thread A) to fsnotify_put_mark() (thread B).\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/notify/mark.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c3638b5b13740fa31762d414bbce8b7a694e582a\",\"lessThan\":\"8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c3638b5b13740fa31762d414bbce8b7a694e582a\",\"lessThan\":\"b740cc86816bbc87902ae9db74cd21abde3c8d63\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c3638b5b13740fa31762d414bbce8b7a694e582a\",\"lessThan\":\"5c80289503da3658e3df80280598c68d181eadbd\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c3638b5b13740fa31762d414bbce8b7a694e582a\",\"lessThan\":\"4aca914ac152f5d055ddcb36704d1e539ac08977\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ff34ebaa6f6dc1eebce6a8d6f12a1566f33d00fe\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"4f145b67c075324b13d6ae7d5abb6e7a1dbac26d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.220\",\"lessThan\":\"5.11\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.15.154\",\"lessThan\":\"5.16\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"fs/notify/mark.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.91\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.33\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.10\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4aca914ac152f5d055ddcb36704d1e539ac08977\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5c80289503da3658e3df80280598c68d181eadbd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8c8afa6444e6bdc145d2bf2f3aeeca6da3e36b42\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b740cc86816bbc87902ae9db74cd21abde3c8d63\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.