{"id":"CVE-2026-98477","summary":"perf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nperf/core: Fix NULL pmu_ctx passed to pmu-\u003esched_task()\n\nperf_pmu_sched_task() returns early when cpuctx-\u003etask_ctx is set, and\ncpc-\u003etask_epc is only non-NULL while a task context is scheduled in on\nthis CPU. __perf_pmu_sched_task() therefore always passes NULL:\n\n  Unable to handle kernel NULL pointer dereference at virtual address 00\n  pc : armv8pmu_sched_task+0x14/0x50\n  Call trace:\n   armv8pmu_sched_task+0x14/0x50 (P)\n   perf_pmu_sched_task+0xac/0x108\n   __perf_event_task_sched_out+0x6c/0xe0\n\nPass &cpc-\u003eepc instead, the CPU-wide context for this PMU, which the\nfunction already dereferences a few lines up to find pmu.\n\narmv8pmu_sched_task() is the only in-tree implementation that\ndereferences the argument, and it only reads -\u003epmu, so the oops needs\nBRBE, added in v6.17.","modified":"2026-10-19T02:46:10.914296246Z","published":"2026-10-18T15:15:51.475Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98477.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/249a2bd87a0e57dc28f36e992807edc9cae309b5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/36bb85cf36cab15fb611cb44b78a5df06e4e69a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b5409311b606d536cc485f3706c242c2afa93edb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ec15f6a50183fc01f470af74ad49900fb3731fca"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98477.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98477"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bd27568117664b8b3e259721393df420ed51f57b"},{"fixed":"b5409311b606d536cc485f3706c242c2afa93edb"},{"fixed":"249a2bd87a0e57dc28f36e992807edc9cae309b5"},{"fixed":"ec15f6a50183fc01f470af74ad49900fb3731fca"},{"fixed":"36bb85cf36cab15fb611cb44b78a5df06e4e69a2"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98477.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98477.json"}}],"schema_version":"1.9.0"}