CVE-2022-50232 (GCVE-0-2022-50232)
Vulnerability from cvelistv5
Published
2025-06-18 11:04
Modified
2025-06-18 11:04
Severity ?
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
Impacted products
Vendor Product Version
Linux Linux Version: 18107f8a2df6bf1c6cac8d0713f757f866d5af51
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/kernel-pgtable.h",
            "arch/arm64/kernel/head.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "775871d4be0d75e219cca937af843a4a1b60489a",
              "status": "affected",
              "version": "18107f8a2df6bf1c6cac8d0713f757f866d5af51",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/arm64/include/asm/kernel-pgtable.h",
            "arch/arm64/kernel/head.S"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "lessThan": "5.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.60",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.60",
                  "versionStartIncluding": "5.13",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:04:07.956Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a"
        }
      ],
      "title": "arm64: set UXN on swapper page tables",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50232",
    "datePublished": "2025-06-18T11:04:07.956Z",
    "dateReserved": "2025-06-18T10:57:27.432Z",
    "dateUpdated": "2025-06-18T11:04:07.956Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50232\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:54.297\",\"lastModified\":\"2025-06-18T13:47:40.833\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/775871d4be0d75e219cca937af843a4a1b60489a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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