{"schema":"threatline.record/2","record":{"id":"CVE-2026-97905","aliases":[],"summary":"cpufreq: zero-initialize policy cpumask before sysfs publication","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: zero-initialize policy cpumask before sysfs publication\n\ncpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(),\ni.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus\nmasks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate\nkmalloc_node() allocation, so its bitmap holds whatever the slab allocator\nleft behind:\n\n  cpufreq_online()\n    cpufreq_policy_alloc()\n      alloc_cpumask_var(&policy->cpus)    /* bitmap is uninitialized */\n      kobject_init_and_add()              /* policy%u/ appears in sysfs */\n    cpufreq_policy_online()\n      cpumask_copy(policy->cpus, cpumask_of(cpu))  /* first valid value */\n\nThis leaves a window in which the sysfs attributes are already reachable\nwhile policy->cpus is still garbage. show()/store() gate on\npolicy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero\nbitmap makes them run the attribute callbacks on a policy that is not\ninitialized yet.\n\nFix this by using zalloc_cpumask_var() for policy->cpus.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"e13370c5b549712f49f80234df249303381c53b4","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"e807920031ca32b668f9e7a1efbd21858f03d64b","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"ca52482508b3ac9febe74ca4f732647d394727b8","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"06f273d29e5e0fe5c775a65c563fbeed8cd94c7a","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"0de2f3918fbbbb767e7e716178194b66560dd12a","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"6e166b9281dec98aed19213a84235250e5fdb081","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"bbc0472d2270bf732142ca71579d6ede636174ed","status":"affected","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","lessThan":"54d37bcf2f497140b9207968557ddb484058e749","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"4.2","status":"affected"},{"version":"0","lessThan":"4.2","status":"unaffected","versionType":"semver"},{"version":"5.10.271","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"06f273d29e5e0fe5c775a65c563fbeed8cd94c7a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"0de2f3918fbbbb767e7e716178194b66560dd12a","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"6e166b9281dec98aed19213a84235250e5fdb081","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","source_modified_at":"2026-10-19T09:10:31.498Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"54d37bcf2f497140b9207968557ddb484058e749","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.0021,"percentile":0.10716,"score_date":"2026-10-23"},"published_at":"2026-09-25T10:22:31.046Z","modified_at":"2026-10-19T09:10:31.498Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-97905","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:10:31.498Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-97905","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/ca52482508b3ac9febe74ca4f732647d394727b8"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/06f273d29e5e0fe5c775a65c563fbeed8cd94c7a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:10:31.498Z","content_hash":"abb170777f1224a5a3a62434be8af2bf1dc1449f2a1af2b511cd93cc29fd9320"}}