« Volver al listado

CVE-2026-64512

Estado: RecibidaSin puntuar—

In the Linux kernel, the following vulnerability has been resolved:

ACPI: CPPC: Suppress UBSAN warning caused by field misuse

The definition of reg->access_width changes depending on the reg->space_id type. Type ACPI_ADR_SPACE_PLATFORM_COMM uses access_width to indicate the PCC region, which can result in a UBSAN if the value is greater than 4.

For example:

Lets fix this by validating the region type, as well as whether access_width has a value. Then since we are returning bit_width directly for ACPI_ADR_SPACE_PLATFORM_COMM, drop the code correcting the size.

Detalles técnicos trazas, registros y código del informe original
 UBSAN: shift-out-of-bounds in drivers/acpi/cppc_acpi.c:1090:9
 shift exponent 32 is too large for 32-bit type 'int'
 CPU: 61 UID: 0 PID: 1220 Comm: (udev-worker) Not tainted 7.0.10-201.fc44.aarch64 #1 PREEMPT(lazy)
 Hardware name: To be filled by O.E.M.
 Call trace:
  ...(trimming)
  ubsan_epilogue+0x10/0x48
  __ubsan_handle_shift_out_of_bounds+0xdc/0x1e0
  cpc_write+0x4d0/0x670
  cppc_set_perf+0x18c/0x490
  cppc_cpufreq_cpu_init+0x1c8/0x380 [cppc_cpufreq]
  ... (trimming)

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2026-64512",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4949affd5288b867cdf115f5b08d6166b2027f87",
              "lessThan": "b54c4632946ae42f2b39ed38abd909bbf78cbcc2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "01fc53be672acae37e611c80cc0b4f3939584de3",
              "lessThan": "e904596ba6dd108534ffa15e3e46b2fe245145e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1b890ae474d19800a6be1696df7fb4d9a41676e4",
              "lessThan": "2fb80e962029000959f651665baa4838cc92eb99",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
              "lessThan": "37f28bf8f14672dfa395994e41fd778a63f0bf5c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
              "lessThan": "f29dc6132d4968e39d8fa575d1a12e2c718ce57b",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
              "lessThan": "dc066bd13c860bb27d6ace511210e18b8064c1d9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "2f4a4d63a193be6fd530d180bb13c3592052904c",
              "lessThan": "1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "6cb6b12b78dcd8867a3fdbb1b6d0ed1df2b208d1",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "5.15.154",
              "lessThan": "5.15.155",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.1.90",
              "lessThan": "6.1.178",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.6.30",
              "lessThan": "6.6.145",
              "versionType": "semver"
            },
            {
              "status": "affected",
              "version": "6.8.9",
              "lessThan": "6.9",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "drivers/acpi/cppc_acpi.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.9"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.9",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.155",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/acpi/cppc_acpi.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-07-25T10:17:37.380",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1b1acf2dada0cc3931bb2cb9ff8832edfbee46a1",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2fb80e962029000959f651665baa4838cc92eb99",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/37f28bf8f14672dfa395994e41fd778a63f0bf5c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/b54c4632946ae42f2b39ed38abd909bbf78cbcc2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dc066bd13c860bb27d6ace511210e18b8064c1d9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e904596ba6dd108534ffa15e3e46b2fe245145e2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f29dc6132d4968e39d8fa575d1a12e2c718ce57b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "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->access_width changes depending on the\nreg->space_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."
    }
  ],
  "lastModified": "2026-08-17T05:17:57.400",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}