FKIE_CVE-2021-47567

Vulnerability from fkie_nvd - Published: 2024-05-24 15:15 - Updated: 2026-06-17 04:17
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: powerpc/32: Fix hardlockup on vmap stack overflow Since the commit c118c7303ad5 ("powerpc/32: Fix vmap stack - Do not activate MMU before reading task struct") a vmap stack overflow results in a hard lockup. This is because emergency_ctx is still addressed with its virtual address allthough data MMU is not active anymore at that time. Fix it by using a physical address instead.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114bPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114bPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.16
linux linux_kernel 5.16
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/kernel/head_32.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7",
              "status": "affected",
              "version": "c118c7303ad528be8ff2aea8cd1ee15452c763f0",
              "versionType": "git"
            },
            {
              "lessThan": "c4e3ff8b8b1d54f0c755670174c453b06e17114b",
              "status": "affected",
              "version": "c118c7303ad528be8ff2aea8cd1ee15452c763f0",
              "versionType": "git"
            },
            {
              "lessThan": "5bb60ea611db1e04814426ed4bd1c95d1487678e",
              "status": "affected",
              "version": "c118c7303ad528be8ff2aea8cd1ee15452c763f0",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3b234b4a6651ed6bdca94553aa0038fc7ded9271",
              "versionType": "git"
            },
            {
              "lessThan": "5.10",
              "status": "affected",
              "version": "5.9.5",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "arch/powerpc/kernel/head_32.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.10"
            },
            {
              "lessThan": "5.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.16",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "ED6B7872-6413-4C9F-9079-2DA4A4AD0DD3",
              "versionEndExcluding": "5.10.83",
              "versionStartIncluding": "5.9.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "990C08FB-0121-4296-896F-556312F8FF3B",
              "versionEndExcluding": "5.15.6",
              "versionStartIncluding": "5.11",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc1:*:*:*:*:*:*",
              "matchCriteriaId": "357AA433-37E8-4323-BFB2-3038D6E4B414",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:5.16:rc2:*:*:*:*:*:*",
              "matchCriteriaId": "A73429BA-C2D9-4D0C-A75F-06A1CA8B3983",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\npowerpc/32: Fix hardlockup on vmap stack overflow\n\nSince the commit c118c7303ad5 (\"powerpc/32: Fix vmap stack - Do not\nactivate MMU before reading task struct\") a vmap stack overflow\nresults in a hard lockup. This is because emergency_ctx is still\naddressed with its virtual address allthough data MMU is not active\nanymore at that time.\n\nFix it by using a physical address instead."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: powerpc/32: corrige el bloqueo f\u00edsico en el desbordamiento de la pila de vmap Desde El commit c118c7303ad5 (\"powerpc/32: corrige la pila de vmap - No activar MMU antes de leer la estructura de la tarea\") un desbordamiento de la pila de vmap resulta en un bloqueo duro. Esto se debe a que Emergency_ctx todav\u00eda se aborda con su direcci\u00f3n virtual, aunque la MMU de datos ya no est\u00e9 activa en ese momento. Solucionarlo utilizando una direcci\u00f3n f\u00edsica en su lugar."
    }
  ],
  "id": "CVE-2021-47567",
  "lastModified": "2026-06-17T04:17:47.140",
  "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"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-47567",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-06-17T17:34:28.307539Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-05-24T15:15:21.837",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/5bb60ea611db1e04814426ed4bd1c95d1487678e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c4e3ff8b8b1d54f0c755670174c453b06e17114b"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/dfe906da9a1abebdebe8b15bb3e66a2578f6c4c7"
    }
  ],
  "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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