{"id":"CVE-2026-97905","state":"PUBLISHED","title":"cpufreq: zero-initialize policy cpumask before sysfs publication","description":"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.","publishedAt":"2026-09-25T10:22:31.046Z","updatedAt":"2026-10-19T09:10:31.498Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"e13370c5b549712f49f80234df249303381c53b4","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"e807920031ca32b668f9e7a1efbd21858f03d64b","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"ca52482508b3ac9febe74ca4f732647d394727b8","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"06f273d29e5e0fe5c775a65c563fbeed8cd94c7a","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"0de2f3918fbbbb767e7e716178194b66560dd12a","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"6e166b9281dec98aed19213a84235250e5fdb081","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"bbc0472d2270bf732142ca71579d6ede636174ed","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"54d37bcf2f497140b9207968557ddb484058e749","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]}],"references":["https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4","https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b","https://git.kernel.org/stable/c/ca52482508b3ac9febe74ca4f732647d394727b8","https://git.kernel.org/stable/c/06f273d29e5e0fe5c775a65c563fbeed8cd94c7a","https://git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a","https://git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081","https://git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed","https://git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/97xxx/CVE-2026-97905.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97905","state":"PUBLISHED","datePublished":"2026-09-25T10:22:31.046Z","dateUpdated":"2026-10-19T09:10:31.498Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-25T10:18:58.200Z"},"containers":{"cna":{"title":"cpufreq: zero-initialize policy cpumask before sysfs publication","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"e13370c5b549712f49f80234df249303381c53b4","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"e807920031ca32b668f9e7a1efbd21858f03d64b","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"ca52482508b3ac9febe74ca4f732647d394727b8","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"06f273d29e5e0fe5c775a65c563fbeed8cd94c7a","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"0de2f3918fbbbb767e7e716178194b66560dd12a","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"6e166b9281dec98aed19213a84235250e5fdb081","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"bbc0472d2270bf732142ca71579d6ede636174ed","versionType":"git"},{"version":"2fc3384dc75bf7333384c7a16d12c796f61c3f56","status":"affected","lessThan":"54d37bcf2f497140b9207968557ddb484058e749","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.2","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.2","versionType":"semver"},{"version":"5.10.271","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.222","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.189","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.158","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.111","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.53","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.7","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/cpufreq/cpufreq.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4"},{"url":"https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b"},{"url":"https://git.kernel.org/stable/c/ca52482508b3ac9febe74ca4f732647d394727b8"},{"url":"https://git.kernel.org/stable/c/06f273d29e5e0fe5c775a65c563fbeed8cd94c7a"},{"url":"https://git.kernel.org/stable/c/0de2f3918fbbbb767e7e716178194b66560dd12a"},{"url":"https://git.kernel.org/stable/c/6e166b9281dec98aed19213a84235250e5fdb081"},{"url":"https://git.kernel.org/stable/c/bbc0472d2270bf732142ca71579d6ede636174ed"},{"url":"https://git.kernel.org/stable/c/54d37bcf2f497140b9207968557ddb484058e749"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T09:10:31.498Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.10.271"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.2","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}