{"id":"CVE-2026-98268","revision":"31e63abe053d4d03b7a89a5549ce06f5","records":[{"revision":"31e63abe053d4d03b7a89a5549ce06f5","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-98268","aliases":[],"title":"perf: Fix null pointer access in is_include_guest_event()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Fix null pointer access in is_include_guest_event()\n\nA typical module unload occurring event when there is an active perf\nconnection leads to freeing of the pmu pointer. The call log is something\nlike:\n ..\n __pmu_detach_event\n pmu_detach_event\n pmu_detach_events\n perf_pmu_unregister\n ..\n\n__pmu_detach_event() sets event->pmu to null. When the perf connection\nfinally is closed, the following stack trace is observed:\n\n Oops: general protection fault, kernel NULL pointer dereference\n ...\n RIP: 0010:_free_event+0x3e/0x370\n ...\n Call Trace:\n ...\n perf_event_release_kernel+0x260/0x2d0\n perf_release+0x12/0x20\n\nA call to mediated_pmu_unaccount_event() inside _free_event() is the root\ncause of this crash. Adding a check inside is_include_guest_event() ensures\nwe don't accidentally access a null pmu ptr. In addition to this, we will\nnow call mediated_pmu_unaccount_event() before clearing the pmu ptr so that\nnr_include_guest_events counts are maintained correctly.","state":0,"publishedAt":"2026-10-06T08:45:30.917+00:00","modifiedAt":"2026-10-19T09:16:39.095+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/events/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"eff95e170275d9e80b968f335cd03d0ac250d2d1\",\n                            \"lessThan\": \"7fa9a465ae8f07c0e4685db6edb6a6f984dbd784\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"eff95e170275d9e80b968f335cd03d0ac250d2d1\",\n                            \"lessThan\": \"88aed0422f39b22406f35f1e758cea25e7bbcfb5\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"kernel/events/core.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"7.0\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"7.0\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.8\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/7fa9a465ae8f07c0e4685db6edb6a6f984dbd784","https://git.kernel.org/stable/c/88aed0422f39b22406f35f1e758cea25e7bbcfb5"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-98268","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-98268","identifiers":["CVE-2026-98268"]},"retained":false,"historicalAffected":[]}],"coverage":[]}