{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.1",
    "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": "2024-09-15T17:54:38.302Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2024-09-15T17:54:38.302Z"
            },
            "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       <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": [
                {
                    "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": "8bffa95ac19f",
                            "lessThan": "67fad724f1b5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "517e6a301f34",
                            "lessThan": "70882d7fa74f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "517e6a301f34",
                            "lessThan": "05d3fd599594",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "517e6a301f34",
                            "lessThan": "3d7a63352a93",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "517e6a301f34",
                            "lessThan": "2fd5ad3f310d",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                },
                {
                    "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": "custom"
                        },
                        {
                            "version": "5.15.165",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.1.103",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.6.44",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.10.3",
                            "lessThanOrEqual": "6.10.*",
                            "status": "unaffected",
                            "versionType": "custom"
                        },
                        {
                            "version": "6.11",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }
            ],
            "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-c9c4e1df01b2"
            }
        },
        "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"
                }
            }
        ]
    }
}