{
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    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
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  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64512.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nACPI: CPPC: Suppress UBSAN warning caused by field misuse\n\nThe definition of reg-\u003eaccess_width changes depending on the\nreg-\u003espace_id type.  Type ACPI_ADR_SPACE_PLATFORM_COMM uses\naccess_width to indicate the PCC region, which can result in a UBSAN\nif the value is greater than 4.\n\nFor example:\n\n UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9\n shift exponent 32 is too large for 32-bit type 'int'\n CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)\n Hardware name: To be filled by O.E.M.\n Call trace:\n  ...(trimming)\n  ubsan_epilogue+0x10/0x48\n  __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0\n  cpc_write+0x4d0/0x670\n  cppc_set_perf+0x18c/0x490\n  cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]\n  ... (trimming)\n\nLets fix this by validating the region type, as well as whether\naccess_width has a value. Then since we are returning bit_width\ndirectly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting\nthe size.",
  "id": "CVE-2026-64512",
  "modified": "2026-07-27T03:56:30.210431416Z",
  "published": "2026-07-25T08:52:04.423Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64512.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64512"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "ACPI: CPPC: Suppress UBSAN warning caused by field misuse"
}