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CVE-2022-49964

Estado: AnalizadaMedia (5.5)—

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

arm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level

Though acpi_find_last_cache_level() always returned signed value and the document states it will return any errors caused by lack of a PPTT table, it never returned negative values before.

Commit 0c80f9e165f8 ("ACPI: PPTT: Leave the table mapped for the runtime usage") however changed it by returning -ENOENT if no PPTT was found. The value returned from acpi_find_last_cache_level() is then assigned to unsigned fw_level.

It will result in the number of cache leaves calculated incorrectly as a huge value which will then cause the following warning from __alloc_pages as the order would be great than MAX_ORDER because of incorrect and huge cache leaves value.

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Fix the same by changing fw_level to be signed integer and return the error from init_cache_level() early in case of error.

Detalles técnicos trazas, registros y código del informe original
  |  WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:5407 __alloc_pages+0x74/0x314
  |  Modules linked in:
  |  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-10393-g7c2a8d3ac4c0 #73
  |  pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
  |  pc : __alloc_pages+0x74/0x314
  |  lr : alloc_pages+0xe8/0x318
  |  Call trace:
  |   __alloc_pages+0x74/0x314
  |   alloc_pages+0xe8/0x318
  |   kmalloc_order_trace+0x68/0x1dc
  |   __kmalloc+0x240/0x338
  |   detect_cache_attributes+0xe0/0x56c
  |   update_siblings_masks+0x38/0x284
  |   store_cpu_topology+0x78/0x84
  |   smp_prepare_cpus+0x48/0x134
  |   kernel_init_freeable+0xc4/0x14c
  |   kernel_init+0x2c/0x1b4
  |   ret_from_fork+0x10/0x20

CVSS

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2022-49964",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "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": "f03d253ba71994b196f342a7acad448a56812a8c",
              "lessThan": "a754ee1c66bd0a23e613f0bf865053b29cb90e16",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "0c80f9e165f8f9cca743d7b6cbdb54362da297e0",
              "lessThan": "e75d18cecbb3805895d8ed64da4f78575ec96043",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/arm64/kernel/cacheinfo.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.19.4",
              "lessThan": "5.19.7",
              "versionType": "semver"
            }
          ],
          "programFiles": [
            "arch/arm64/kernel/cacheinfo.c"
          ],
          "defaultStatus": "unaffected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:23.677",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/a754ee1c66bd0a23e613f0bf865053b29cb90e16",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e75d18cecbb3805895d8ed64da4f78575ec96043",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\narm64: cacheinfo: Fix incorrect assignment of signed error value to unsigned fw_level\n\nThough acpi_find_last_cache_level() always returned signed value and the\ndocument states it will return any errors caused by lack of a PPTT table,\nit never returned negative values before.\n\nCommit 0c80f9e165f8 (\"ACPI: PPTT: Leave the table mapped for the runtime usage\")\nhowever changed it by returning -ENOENT if no PPTT was found. The value\nreturned from acpi_find_last_cache_level() is then assigned to unsigned\nfw_level.\n\nIt will result in the number of cache leaves calculated incorrectly as\na huge value which will then cause the following warning from __alloc_pages\nas the order would be great than MAX_ORDER because of incorrect and huge\ncache leaves value.\n\n  |  WARNING: CPU: 0 PID: 1 at mm/page_alloc.c:5407 __alloc_pages+0x74/0x314\n  |  Modules linked in:\n  |  CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.19.0-10393-g7c2a8d3ac4c0 #73\n  |  pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)\n  |  pc : __alloc_pages+0x74/0x314\n  |  lr : alloc_pages+0xe8/0x318\n  |  Call trace:\n  |   __alloc_pages+0x74/0x314\n  |   alloc_pages+0xe8/0x318\n  |   kmalloc_order_trace+0x68/0x1dc\n  |   __kmalloc+0x240/0x338\n  |   detect_cache_attributes+0xe0/0x56c\n  |   update_siblings_masks+0x38/0x284\n  |   store_cpu_topology+0x78/0x84\n  |   smp_prepare_cpus+0x48/0x134\n  |   kernel_init_freeable+0xc4/0x14c\n  |   kernel_init+0x2c/0x1b4\n  |   ret_from_fork+0x10/0x20\n\nFix the same by changing fw_level to be signed integer and return the\nerror from init_cache_level() early in case of error."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: cacheinfo: Se corrige la asignación incorrecta de un valor de error con signo a unsigned fw_level. Aunque acpi_find_last_cache_level() siempre devolvía un valor con signo y el documento indica que devolverá cualquier error causado por la falta de una tabla PPTT, nunca antes devolvía valores negativos. Sin embargo, el commit 0c80f9e165f8 (\"ACPI: PPTT: Dejar la tabla asignada para el uso en tiempo de ejecución\") la modificó devolviendo -ENOENT si no se encontraba PPTT. El valor devuelto por acpi_find_last_cache_level() se asigna entonces a unsigned fw_level. Esto provocará que el número de hojas de caché se calcule incorrectamente como un valor enorme, lo que provocará la siguiente advertencia de __alloc_pages, ya que el orden sería mayor que MAX_ORDER debido a un valor incorrecto y enorme de hojas de caché. ADVERTENCIA: CPU: 0 PID: 1 en mm/page_alloc.c:5407 __alloc_pages+0x74/0x314 | Módulos vinculados: | CPU: 0 PID: 1 Comm: swapper/0 No contaminado 5.19.0-10393-g7c2a8d3ac4c0 #73 | pstate: 20000005 (nzCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) | pc : __alloc_pages+0x74/0x314 | lr : alloc_pages+0xe8/0x318 | Rastreo de llamadas: | __alloc_pages+0x74/0x314 | alloc_pages+0xe8/0x318 | kmalloc_order_trace+0x68/0x1dc | Corrija el mismo problema cambiando fw_level para que sea un entero con signo y devuelva el error de init_cache_level() de manera temprana en caso de error."
    }
  ],
  "lastModified": "2026-06-17T05:19:38.163",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "53782EE9-985B-4CD0-B4B8-22210A8CBCB9",
              "versionEndExcluding": "5.19.7",
              "versionStartIncluding": "5.19.4"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}