{"id":"CVE-2026-92492","summary":"cpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq/amd-pstate: handle missing policy in dynamic EPP callbacks\n\ncpufreq_cpu_get() returns NULL when no cpufreq policy is associated with\nthe requested CPU, for example because the CPU is offline or the policy\nhas already been torn down.  Both amd_pstate_power_supply_notifier() and\namd_pstate_profile_set() acquire a policy via cpufreq_cpu_get() and then\npass that pointer to amd_pstate_get_balanced_epp() and\namd_pstate_set_epp(), which dereference it unconditionally.  A racing\nCPU hotplug or driver teardown can therefore lead to a NULL pointer\ndereference on either of these dynamic EPP paths.\n\nThe third cpufreq_cpu_get() caller in this file, amd_pstate_verify(),\nalready handles the NULL case.  Bring the two new callers in line with\nthat pattern: return NOTIFY_OK from the power-supply notifier (matching\nthe other \"nothing to do\" exits) and -ENODEV from amd_pstate_profile_set()\n(the usual cpufreq error for a missing CPU policy).\n\nFound by code inspection; not tested on hardware.","modified":"2026-09-19T03:47:26.457638082Z","published":"2026-09-17T16:10:07.957Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92492.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/39c0cf62fc7851a17782e7efe8dfb2948739c681"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70c8c8b50d80f681f50ddcc66a9400dd87508913"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f4ade8d224756ab69f108204dde6777bac4664e4"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/92xxx/CVE-2026-92492.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-92492"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"471d6659925aa0dcb4ab2520fa5ee3f49dfeab22"},{"fixed":"70c8c8b50d80f681f50ddcc66a9400dd87508913"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e30ca6dd5345c5b8ba05f346a8e81105352fe571"},{"fixed":"f4ade8d224756ab69f108204dde6777bac4664e4"},{"fixed":"39c0cf62fc7851a17782e7efe8dfb2948739c681"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92492.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.1.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-92492.json"}}],"schema_version":"1.9.0"}