fkie_cve-2022-50230
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-11-19 12:57
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: arm64: set UXN on swapper page tables [ 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 ] 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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9283e708a9b8529e7aafac9ab5c5c79a9fab8846Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394cPatch
Impacted products
Vendor Product Version
linux linux_kernel *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "52E5D9CF-2FE0-473C-B168-062DD8BF64D2",
              "versionEndExcluding": "5.19.1",
              "versionStartIncluding": "5.13",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "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 p\u00e1ginas del intercambiador [Este problema se corrigi\u00f3 accidentalmente en c3cee924bd85 (\"arm64: head: cubrir toda la imagen del kernel en el mapa de ID inicial\") como parte de una refactorizaci\u00f3n a gran escala del flujo de arranque de arm64. Por lo tanto, esta sencilla soluci\u00f3n es la preferida para la retroportaci\u00f3n de -stable]. En un sistema que implementa FEAT_EPAN, se deniega el acceso de lectura/escritura al mapa de ID porque UXN no est\u00e1 establecido en las PTE del intercambiador. Como resultado, idmap_kpti_install_ng_mappings genera un p\u00e1nico en el kernel al acceder a __idmap_kpti_flag. Se soluciona estableciendo UXN en estas PTE."
    }
  ],
  "id": "CVE-2022-50230",
  "lastModified": "2025-11-19T12:57:34.460",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2025-06-18T11:15:54.083",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9283e708a9b8529e7aafac9ab5c5c79a9fab8846"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c3cee924bd855184d15bc4aa6088dcf8e2c1394c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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