CVE-2026-97905 (GCVE-0-2026-97905)
Vulnerability from cvelistv5
Published
2026-09-25 10:22
Modified
2026-10-19 09:10
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: cpufreq: zero-initialize policy cpumask before sysfs publication cpufreq_policy_alloc() allocates policy->cpus with alloc_cpumask_var(), i.e. without __GFP_ZERO, unlike the sibling related_cpus and real_cpus masks. With CONFIG_CPUMASK_OFFSTACK=y the mask is a separate kmalloc_node() allocation, so its bitmap holds whatever the slab allocator left behind: cpufreq_online() cpufreq_policy_alloc() alloc_cpumask_var(&policy->cpus) /* bitmap is uninitialized */ kobject_init_and_add() /* policy%u/ appears in sysfs */ cpufreq_policy_online() cpumask_copy(policy->cpus, cpumask_of(cpu)) /* first valid value */ This leaves a window in which the sysfs attributes are already reachable while policy->cpus is still garbage. show()/store() gate on policy_is_inactive(), i.e. cpumask_empty(policy->cpus), so a non-zero bitmap makes them run the attribute callbacks on a policy that is not initialized yet. Fix this by using zalloc_cpumask_var() for policy->cpus.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
Version: 2fc3384dc75bf7333384c7a16d12c796f61c3f56
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/cpufreq/cpufreq.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            },
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              "version": "0",
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              "version": "5.15.222",
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              "version": "6.1.189",
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            },
            {
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            },
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            },
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
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        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003ecpus 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(\u0026policy-\u003ecpus)    /* bitmap is uninitialized */\n      kobject_init_and_add()              /* policy%u/ appears in sysfs */\n    cpufreq_policy_online()\n      cpumask_copy(policy-\u003ecpus, cpumask_of(cpu))  /* first valid value */\n\nThis leaves a window in which the sysfs attributes are already reachable\nwhile policy-\u003ecpus is still garbage. show()/store() gate on\npolicy_is_inactive(), i.e. cpumask_empty(policy-\u003ecpus), 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-\u003ecpus."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:10:31.498Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/e13370c5b549712f49f80234df249303381c53b4"
        },
        {
          "url": "https://git.kernel.org/stable/c/e807920031ca32b668f9e7a1efbd21858f03d64b"
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        {
          "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"
        }
      ],
      "title": "cpufreq: zero-initialize policy cpumask before sysfs publication",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-97905",
    "datePublished": "2026-09-25T10:22:31.046Z",
    "dateReserved": "2026-09-25T10:18:58.200Z",
    "dateUpdated": "2026-10-19T09:10:31.498Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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