cpufreq: pcc: fix use-after-free and double free in _OSC evaluation

{
  "id": "ff478d60cbe47338c9ce9fab56f8bf47397367d48c0b3b9f5fb53b46c859e689",
  "url": "https://osv.dev/vulnerability/CVE-2026-64372",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cpufreq: pcc: fix use-after-free and double free in _OSC evaluation",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cpufreq: pcc: fix use-after-free and double free in _OSC evaluation pcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the two-phase _OSC negotiation. Between the two calls it freed output.pointer but left output.length unchanged. Since acpi_evaluate_object() treats a non-zero length with a non-NULL pointer as an existing buffer to write into, the second call wrote into freed memory (use-after-free). The subsequent kfree(output.pointer) at out_free then freed the same pointer a second time (double free). Reset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER after freeing the first result, so ACPICA allocates a fresh buffer for each phase independently.",
    "evidence": "osv:CVE-2026-64372",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.261",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.212",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.178",
            "evidence": "/affected/1/ranges"
          },
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            "value": "6.6.145",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.96",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.39",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64372",
      "aliases": [
        "CVE-2026-64372"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "0f1d683fb35d6c6f49ef696c95757f3970682a0e"
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                {
                  "fixed": "8e454e9d0bc03446d610ee49abec9dfd424f6541"
                },
                {
                  "fixed": "632666a63116d8061c62a988d1ca39dcd6d27c9b"
                },
                {
                  "fixed": "5cdb25f144b101083d8bf3fd023ad87fbe6850d7"
                },
                {
                  "fixed": "982c9f92d57bda2b769851ff6d90d43dcf5f3734"
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                {
                  "fixed": "a36ca93a8ba57464e521d70a337d37f069064111"
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                  "fixed": "6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7"
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                {
                  "fixed": "0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29"
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                  "fixed": "266d3dd8b757b48a576e90f018b51f7b7563cc32"
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64372.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.34"
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                  "fixed": "5.10.261"
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              ]
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            {
              "type": "ECOSYSTEM",
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                  "introduced": "5.11.0"
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            {
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                  "introduced": "6.7.0"
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                  "introduced": "6.13.0"
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            {
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          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64372.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:37.413980598Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29",
        "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32",
        "https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7",
        "https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b",
        "https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7",
        "https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541",
        "https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734",
        "https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64372.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64372",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64372.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64372",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504883,
  "published_at": "2026-07-25T08:50:24.733+00:00"
}