{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-64372",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-64372"
  ],
  "published": "2026-07-25T08:51:45Z",
  "summary": "cpufreq: pcc: fix use-after-free and double free in _OSC evaluation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ncpufreq: pcc: fix use-after-free and double free in _OSC evaluation\n\npcc_cpufreq_do_osc() calls acpi_evaluate_object() twice for the\ntwo-phase _OSC negotiation. Between the two calls it freed\noutput.pointer but left output.length unchanged. Since\nacpi_evaluate_object() treats a non-zero length with a non-NULL\npointer as an existing buffer to write into, the second call wrote\ninto freed memory (use-after-free). The subsequent kfree(output.pointer)\nat out_free then freed the same pointer a second time (double free).\n\nReset output.pointer to NULL and output.length to ACPI_ALLOCATE_BUFFER\nafter freeing the first result, so ACPICA allocates a fresh buffer for\neach phase independently.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
  "affected": [
    {
      "package": {
        "ecosystem": "Raspberry Pi OS:12",
        "name": "linux"
      },
      "versions": [
        "1:6.1.47-1+rpt4"
      ],
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-2712",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v6",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v7l",
            "binary_version": "1:6.1.47-1+rpt4"
          },
          {
            "binary_name": "linux-image-6.1.0-rpi3-rpi-v8",
            "binary_version": "1:6.1.47-1+rpt4"
          }
        ]
      },
      "database_specific": {
        "per_version": {
          "1:6.1.47-1+rpt4": {
            "linux_commit": "655fc658a15ae7a6f37103754adb39ba52a9a14e",
            "upstream_version": "6.1.47",
            "assessment": "commit ancestry (strak rule)",
            "upstream_fixed": "6.1.178",
            "compiled_filter": false
          }
        }
      }
    }
  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-64372"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8e454e9d0bc03446d610ee49abec9dfd424f6541"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/632666a63116d8061c62a988d1ca39dcd6d27c9b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/5cdb25f144b101083d8bf3fd023ad87fbe6850d7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/982c9f92d57bda2b769851ff6d90d43dcf5f3734"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/a36ca93a8ba57464e521d70a337d37f069064111"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6ba6f6783be2ffeb2cbcdc9321c4b9f708f796f7"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0e3c739a2f6fc1de5b19a8839ab80696b9cb2a29"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/266d3dd8b757b48a576e90f018b51f7b7563cc32"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The flaw is reached during local initialization of the x86 PCC cpufreq driver on systems exposing the required ACPI PCC objects; no network, radio, or hot-plug input reaches this path.\nAC:L - Once two-phase _OSC negotiation succeeds, the stale-buffer write and subsequent double free occur deterministically without a race or other condition beyond attacker influence.\nPR:L - PCC platform-device creation and driver probing can occur automatically during boot or module autoload, leaving exploitable heap corruption without the attacker needing CAP_SYS_MODULE. A basic local user can groom and consume the resulting overlapping or corrupted slab objects.\nUI:N - The vulnerable driver probe and _OSC negotiation occur automatically and require no victim action.\nS:U - The corruption affects the host kernel within the same security authority and does not inherently cross a VM, IOMMU, or sandbox boundary.\nC:H - The use-after-free and double free can produce overlapping kernel heap objects, enabling disclosure of arbitrary kernel memory.\nI:H - The freed-object write and allocator freelist corruption can enable arbitrary kernel-memory modification and control-flow hijacking.\nA:H - Hardened allocators may immediately detect the double free and stop the kernel, while other configurations can crash or panic from the corrupted slab freelist."
    }
  }
}