FKIE_CVE-2021-46922

Vulnerability from fkie_nvd - Published: 2024-02-27 10:15 - Updated: 2026-06-17 04:15
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: KEYS: trusted: Fix TPM reservation for seal/unseal The original patch 8c657a0590de ("KEYS: trusted: Reserve TPM for seal and unseal operations") was correct on the mailing list: https://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/ But somehow got rebased so that the tpm_try_get_ops() in tpm2_seal_trusted() got lost. This causes an imbalanced put of the TPM ops and causes oopses on TIS based hardware. This fix puts back the lost tpm_try_get_ops()
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/keys/trusted-keys/trusted_tpm2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "bf84ef2dd2ccdcd8f2658476d34b51455f970ce4",
              "status": "affected",
              "version": "67118bb78d72aab5b831f054a74ae856339a1974",
              "versionType": "git"
            },
            {
              "lessThan": "39c8d760d44cb3fa0d67e8cd505df81cf4d80999",
              "status": "affected",
              "version": "498b8fc1cdc13b57b02dd28544b18323900fae10",
              "versionType": "git"
            },
            {
              "lessThan": "9d5171eab462a63e2fbebfccf6026e92be018f20",
              "status": "affected",
              "version": "8c657a0590de585b1115847c17b34a58025f2f4b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "security/keys/trusted-keys/trusted_tpm2.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5.10.33",
              "status": "affected",
              "version": "5.10.20",
              "versionType": "semver"
            },
            {
              "lessThan": "5.11.17",
              "status": "affected",
              "version": "5.11.3",
              "versionType": "semver"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "678C39EB-D88C-48F4-A92A-6DCED8C4AAB3",
              "versionEndExcluding": "5.10.33",
              "versionStartIncluding": "5.10.20",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "958FE4FA-5C20-44BA-AED2-CC30933595C2",
              "versionEndExcluding": "5.11.17",
              "versionStartIncluding": "5.11.3",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKEYS: trusted: Fix TPM reservation for seal/unseal\n\nThe original patch 8c657a0590de (\"KEYS: trusted: Reserve TPM for seal\nand unseal operations\") was correct on the mailing list:\n\nhttps://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/\n\nBut somehow got rebased so that the tpm_try_get_ops() in\ntpm2_seal_trusted() got lost.  This causes an imbalanced put of the\nTPM ops and causes oopses on TIS based hardware.\n\nThis fix puts back the lost tpm_try_get_ops()"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: KEYS: de confianza: corrige la reserva de TPM para sellar/dessellar El parche original 8c657a0590de (\"KEYS: de confianza: reservar TPM para operaciones de sellar y dessellar\") era correcto en la lista de correo: https ://lore.kernel.org/linux-integrity/20210128235621.127925-4-jarkko@kernel.org/ Pero de alguna manera se modific\u00f3 la base para que tpm_try_get_ops() en tpm2_seal_trusted() se perdiera. Esto provoca un desequilibrio en las operaciones de TPM y provoca fallos en el hardware basado en TIS. Esta soluci\u00f3n devuelve el tpm_try_get_ops() perdido"
    }
  ],
  "id": "CVE-2021-46922",
  "lastModified": "2026-06-17T04:15:51.557",
  "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-2021-46922",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-07-25T16:00:18.491671Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-02-27T10:15:07.053",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/39c8d760d44cb3fa0d67e8cd505df81cf4d80999"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9d5171eab462a63e2fbebfccf6026e92be018f20"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/bf84ef2dd2ccdcd8f2658476d34b51455f970ce4"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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