{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2024-43870",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2024-43870",
    "idYear": 2024,
    "status": "PUBLISHED",
    "publishedAt": "2024-08-21T00:06:21.878Z",
    "updatedAt": "2026-05-23T15:53:04.961Z",
    "importedAt": "2026-10-24T01:57:16.009Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "perf: Fix event leak upon exit",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix event leak upon exit\n\nWhen a task is scheduled out, pending sigtrap deliveries are deferred\nto the target task upon resume to userspace via task_work.\n\nHowever failures while adding an event's callback to the task_work\nengine are ignored. And since the last call for events exit happen\nafter task work is eventually closed, there is a small window during\nwhich pending sigtrap can be queued though ignored, leaking the event\nrefcount addition such as in the following scenario:\n\n    TASK A\n    -----\n\n    do_exit()\n       exit_task_work(tsk);\n\n       <IRQ>\n       perf_event_overflow()\n          event->pending_sigtrap = pending_id;\n          irq_work_queue(&event->pending_irq);\n       </IRQ>\n    =========> PREEMPTION: TASK A -> TASK B\n       event_sched_out()\n          event->pending_sigtrap = 0;\n          atomic_long_inc_not_zero(&event->refcount)\n          // FAILS: task work has exited\n          task_work_add(&event->pending_task)\n       [...]\n       <IRQ WORK>\n       perf_pending_irq()\n          // early return: event->oncpu = -1\n       </IRQ WORK>\n       [...]\n    =========> TASK B -> TASK A\n       perf_event_exit_task(tsk)\n          perf_event_exit_event()\n             free_event()\n                WARN(atomic_long_cmpxchg(&event->refcount, 1, 0) != 1)\n                // leak event due to unexpected refcount == 2\n\nAs a result the event is never released while the task exits.\n\nFix this with appropriate task_work_add()'s error handling.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "8bffa95ac19ff27c8261904f89d36c7fcf215d59",
              "status": "affected",
              "versionType": "git",
              "lessThan": "67fad724f1b568b356c1065d50df46e6b30eb2f7"
            },
            {
              "version": "517e6a301f34613bff24a8e35b5455884f2d83d8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "70882d7fa74f0731492a0d493e8515a4f7131831"
            },
            {
              "version": "517e6a301f34613bff24a8e35b5455884f2d83d8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "05d3fd599594abf79aad4484bccb2b26e1cb0b51"
            },
            {
              "version": "517e6a301f34613bff24a8e35b5455884f2d83d8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a"
            },
            {
              "version": "517e6a301f34613bff24a8e35b5455884f2d83d8",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2fd5ad3f310de22836cdacae919dd99d758a1f1b"
            },
            {
              "version": "78e1317a174edbfd1182599bf76c092a2877672c",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "5.15.84",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.165"
            },
            {
              "version": "6.0.14",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.1",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.1"
            },
            {
              "version": "5.15.165",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.103",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.44",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.10.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.10.*"
            },
            {
              "version": "6.11",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}