{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-43870", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-08-17T09:11:59.280Z", "datePublished": "2024-08-21T00:06:21.878Z", "dateUpdated": "2026-05-23T15:53:04.961Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-05-23T15:53:04.961Z" }, "descriptions": [ { "lang": "en", "value": "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 \n perf_event_overflow()\n event->pending_sigtrap = pending_id;\n irq_work_queue(&event->pending_irq);\n \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 \n perf_pending_irq()\n // early return: event->oncpu = -1\n \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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/events/core.c" ], "versions": [ { "version": "8bffa95ac19ff27c8261904f89d36c7fcf215d59", "lessThan": "67fad724f1b568b356c1065d50df46e6b30eb2f7", "status": "affected", "versionType": "git" }, { "version": "517e6a301f34613bff24a8e35b5455884f2d83d8", "lessThan": "70882d7fa74f0731492a0d493e8515a4f7131831", "status": "affected", "versionType": "git" }, { "version": "517e6a301f34613bff24a8e35b5455884f2d83d8", "lessThan": "05d3fd599594abf79aad4484bccb2b26e1cb0b51", "status": "affected", "versionType": "git" }, { "version": "517e6a301f34613bff24a8e35b5455884f2d83d8", "lessThan": "3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a", "status": "affected", "versionType": "git" }, { "version": "517e6a301f34613bff24a8e35b5455884f2d83d8", "lessThan": "2fd5ad3f310de22836cdacae919dd99d758a1f1b", "status": "affected", "versionType": "git" }, { "version": "78e1317a174edbfd1182599bf76c092a2877672c", "status": "affected", "versionType": "git" }, { "version": "5.15.84", "lessThan": "5.15.165", "status": "affected", "versionType": "semver" }, { "version": "6.0.14", "lessThan": "6.1", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "kernel/events/core.c" ], "versions": [ { "version": "6.1", "status": "affected" }, { "version": "0", "lessThan": "6.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.165", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.103", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.44", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10.3", "lessThanOrEqual": "6.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.11", "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": "5.15.84", "versionEndExcluding": "5.15.165" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.1.103" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.6.44" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.10.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1", "versionEndExcluding": "6.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.14" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/67fad724f1b568b356c1065d50df46e6b30eb2f7" }, { "url": "https://git.kernel.org/stable/c/70882d7fa74f0731492a0d493e8515a4f7131831" }, { "url": "https://git.kernel.org/stable/c/05d3fd599594abf79aad4484bccb2b26e1cb0b51" }, { "url": "https://git.kernel.org/stable/c/3d7a63352a93bdb8a1cdf29606bf617d3ac1c22a" }, { "url": "https://git.kernel.org/stable/c/2fd5ad3f310de22836cdacae919dd99d758a1f1b" } ], "title": "perf: Fix event leak upon exit", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-43870", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T16:06:23.024053Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-12T17:33:18.734Z" } }, { "title": "CVE Program Container", "references": [ { "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html" } ], "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T22:06:18.842Z" } } ] } }