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CVE-2022-50232

Estado: AnalizadaMedia (5.5)—

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

arm64: set UXN on swapper page tables

On a system that implements FEAT_EPAN, read/write access to the idmap is denied because UXN is not set on the swapper PTEs. As a result, idmap_kpti_install_ng_mappings panics the kernel when accessing __idmap_kpti_flag. Fix it by setting UXN on these PTEs.

Detalles técnicos trazas, registros y código del informe original
[ This issue was fixed upstream by accident in c3cee924bd85 ("arm64:
  head: cover entire kernel image in initial ID map") as part of a
  large refactoring of the arm64 boot flow. This simple fix is therefore
  preferred for -stable backporting ]

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)

Mostrar
{
  "id": "CVE-2022-50232",
  "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": "18107f8a2df6bf1c6cac8d0713f757f866d5af51",
              "lessThan": "775871d4be0d75e219cca937af843a4a1b60489a",
              "versionType": "git"
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            {
              "status": "affected",
              "version": "18107f8a2df6bf1c6cac8d0713f757f866d5af51",
              "lessThan": "c3cee924bd855184d15bc4aa6088dcf8e2c1394c",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "arch/arm64/include/asm/kernel-pgtable.h",
            "arch/arm64/kernel/head.S"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.60",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "arch/arm64/include/asm/kernel-pgtable.h",
            "arch/arm64/kernel/head.S"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-06-18T11:15:54.297",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394c",
      "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: set UXN on swapper page tables\n\n[ This issue was fixed upstream by accident in c3cee924bd85 (\"arm64:\n  head: cover entire kernel image in initial ID map\") as part of a\n  large refactoring of the arm64 boot flow. This simple fix is therefore\n  preferred for -stable backporting ]\n\nOn a system that implements FEAT_EPAN, read/write access to the idmap\nis denied because UXN is not set on the swapper PTEs. As a result,\nidmap_kpti_install_ng_mappings panics the kernel when accessing\n__idmap_kpti_flag. Fix it by setting UXN on these PTEs."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: arm64: establecer UXN en las tablas de páginas del intercambiador [Este problema se corrigió accidentalmente en c3cee924bd85 (\"arm64: head: cubrir toda la imagen del kernel en el mapa de ID inicial\") como parte de una refactorización a gran escala del flujo de arranque de arm64. Por lo tanto, esta sencilla solución es la preferida para la retroportación de -stable]. En un sistema que implementa FEAT_EPAN, se deniega el acceso de lectura/escritura al mapa de ID porque UXN no está establecido en las PTE del intercambiador. Como resultado, idmap_kpti_install_ng_mappings genera un pánico en el kernel al acceder a __idmap_kpti_flag. Se soluciona estableciendo UXN en estas PTE."
    }
  ],
  "lastModified": "2026-06-17T05:23:02.067",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "15EF7457-6A86-4C0D-AF54-F763498843C5",
              "versionEndExcluding": "5.15.60",
              "versionStartIncluding": "5.13"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6B6A7A8C-53A0-4231-8D93-7E82EE88D700",
              "versionEndExcluding": "6.0",
              "versionStartIncluding": "5.16"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}