Vulnerability-Lookup

CVE-2026-98845 (GCVE-0-2026-98845)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:50 – Updated: 2026-10-18 15:50

Title

tpm: Disable TPM on null key name mismatch

Summary

In the Linux kernel, the following vulnerability has been resolved: tpm: Disable TPM on null key name mismatch The null key name check exists to protect against TPM reset attacks, so a mismatch should stop the device from serving further requests. Currently it does not disable the chip when it finds a mismatch. The mismatch is logged: tpm tpm0: null key integrity check failed but the chip keeps serving commands: / # tpm2_getcap -c properties-fixed TPM_PT_FAMILY_INDICATOR: as UINT32: 0x08322e3000 as string: "2.0" ... tpm2_load_null() where the null key name check is run sets the chip as disabled only if the rc is non zero. When the mismatch is seen, rc is zero at that point and it returns success. The other issue is that the caller expects the null key handle to be populated when the function returns 0 which it does here without writing the handle and proceeds assuming the null key handle is valid. During the test, I noticed that tpm2_start_auth_session() uses the uninitialized stack value as the key handle since tpm2_load_null() returns 0 despite the integrity failure and proceeds with TPM2_CC_START_AUTH_SESS with this value as salt key handle. Set rc to -ENODEV on the mismatch. The error path then disables the chip and returns the correct code to the caller. Tested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making TPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name of the re-created null key. The chip is now disabled on the mismatch.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 7100 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/a03d0c64cd827a622…
https://git.kernel.org/stable/c/96c46c75b0d470b42…
https://git.kernel.org/stable/c/f6599d8830fe7ddab…
https://git.kernel.org/stable/c/015fb29a748342a18…

Impacted products

2 products

Vendor	Product	Version	CPE status
Linux	Linux	Affected: cc7d8594342a25693d40fe96f97e5c6c29ee609c , < a03d0c64cd827a622578623a78defd66b6593b82 (git) Affected: cc7d8594342a25693d40fe96f97e5c6c29ee609c , < 96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa (git) Affected: cc7d8594342a25693d40fe96f97e5c6c29ee609c , < f6599d8830fe7ddab7334cc17846fd9ac9a7fa50 (git) Affected: cc7d8594342a25693d40fe96f97e5c6c29ee609c , < 015fb29a748342a186f37b602ac70017098c8251 (git) Affected: 294984ce51c19c2af3d0d71e1c8bd589bc86b8e2 (git) Affected: 386c7cc6c06d64cbf36d15c5e2319814765e107c (git) Affected: 6.11.7 , < 6.12 (semver) Affected: 6.11.10 , < 6.12 (semver)	guessed
Linux	Linux	Affected: 6.12 Unaffected: 0 , < 6.12 (semver) Unaffected: 6.12.113 , ≤ 6.12.* (semver) Unaffected: 6.18.56 , ≤ 6.18.* (semver) Unaffected: 7.2.10 , ≤ 7.2.* (semver) Unaffected: 7.3-rc6 , ≤ * (original_commit_for_fix)	guessed

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-sessions.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "versionType": "git"
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              "status": "affected",
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              "versionType": "git"
            },
            {
              "lessThan": "015fb29a748342a186f37b602ac70017098c8251",
              "status": "affected",
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              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "294984ce51c19c2af3d0d71e1c8bd589bc86b8e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "386c7cc6c06d64cbf36d15c5e2319814765e107c",
              "versionType": "git"
            },
            {
              "lessThan": "6.12",
              "status": "affected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12",
              "status": "affected",
              "version": "6.11.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-sessions.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
                  "versionStartIncluding": "6.12",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.10",
                  "versionStartIncluding": "6.12",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc6",
                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.11.7",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.11.10",
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                }
              ],
              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: Disable TPM on null key name mismatch\n\nThe null key name check exists to protect against TPM reset attacks, so\na mismatch should stop the device from serving further requests.\nCurrently it does not disable the chip when it finds a mismatch.\n\nThe mismatch is logged:\n\n    tpm tpm0: null key integrity check failed\n\nbut the chip keeps serving commands:\n\n    / # tpm2_getcap -c properties-fixed\n    TPM_PT_FAMILY_INDICATOR:\n      as UINT32:                0x08322e3000\n      as string:                \"2.0\"\n    ...\n\ntpm2_load_null() where the null key name check is run sets the chip as\ndisabled only if the rc is non zero. When the mismatch is seen, rc is\nzero at that point and it returns success. The other issue is that the\ncaller expects the null key handle to be populated when the function\nreturns 0 which it does here without writing the handle and proceeds\nassuming the null key handle is valid.\n\nDuring the test, I noticed that tpm2_start_auth_session() uses the\nuninitialized stack value as the key handle since tpm2_load_null()\nreturns 0 despite the integrity failure and proceeds with\nTPM2_CC_START_AUTH_SESS with this value as salt key handle.\n\nSet rc to -ENODEV on the mismatch. The error path then disables the chip\nand returns the correct code to the caller.\n\nTested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making\nTPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name\nof the re-created null key. The chip is now disabled on the mismatch."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-18T15:50:27.596Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a03d0c64cd827a622578623a78defd66b6593b82"
        },
        {
          "url": "https://git.kernel.org/stable/c/96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa"
        },
        {
          "url": "https://git.kernel.org/stable/c/f6599d8830fe7ddab7334cc17846fd9ac9a7fa50"
        },
        {
          "url": "https://git.kernel.org/stable/c/015fb29a748342a186f37b602ac70017098c8251"
        }
      ],
      "title": "tpm: Disable TPM on null key name mismatch",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98845",
    "datePublished": "2026-10-18T15:50:27.596Z",
    "dateReserved": "2026-09-25T10:25:14.373Z",
    "dateUpdated": "2026-10-18T15:50:27.596Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/char/tpm/tpm2-sessions.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "a03d0c64cd827a622578623a78defd66b6593b82",
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                    "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa",
                    "status": "affected",
                    "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
                    "versionType": "git"
                  },
                  {
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                    "status": "affected",
                    "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "015fb29a748342a186f37b602ac70017098c8251",
                    "status": "affected",
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                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "294984ce51c19c2af3d0d71e1c8bd589bc86b8e2",
                    "versionType": "git"
                  },
                  {
                    "status": "affected",
                    "version": "386c7cc6c06d64cbf36d15c5e2319814765e107c",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "6.12",
                    "status": "affected",
                    "version": "6.11.7",
                    "versionType": "semver"
                  },
                  {
                    "lessThan": "6.12",
                    "status": "affected",
                    "version": "6.11.10",
                    "versionType": "semver"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/char/tpm/tpm2-sessions.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.12"
                  },
                  {
                    "lessThan": "6.12",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.113",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
                    "status": "unaffected",
                    "version": "6.18.56",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "7.2.*",
                    "status": "unaffected",
                    "version": "7.2.10",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "7.3-rc6",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: Disable TPM on null key name mismatch\n\nThe null key name check exists to protect against TPM reset attacks, so\na mismatch should stop the device from serving further requests.\nCurrently it does not disable the chip when it finds a mismatch.\n\nThe mismatch is logged:\n\n    tpm tpm0: null key integrity check failed\n\nbut the chip keeps serving commands:\n\n    / # tpm2_getcap -c properties-fixed\n    TPM_PT_FAMILY_INDICATOR:\n      as UINT32:                0x08322e3000\n      as string:                \"2.0\"\n    ...\n\ntpm2_load_null() where the null key name check is run sets the chip as\ndisabled only if the rc is non zero. When the mismatch is seen, rc is\nzero at that point and it returns success. The other issue is that the\ncaller expects the null key handle to be populated when the function\nreturns 0 which it does here without writing the handle and proceeds\nassuming the null key handle is valid.\n\nDuring the test, I noticed that tpm2_start_auth_session() uses the\nuninitialized stack value as the key handle since tpm2_load_null()\nreturns 0 despite the integrity failure and proceeds with\nTPM2_CC_START_AUTH_SESS with this value as salt key handle.\n\nSet rc to -ENODEV on the mismatch. The error path then disables the chip\nand returns the correct code to the caller.\n\nTested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making\nTPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name\nof the re-created null key. The chip is now disabled on the mismatch."
          }
        ],
        "id": "CVE-2026-98845",
        "lastModified": "2026-10-18T16:17:38.833",
        "metrics": {},
        "published": "2026-10-18T16:17:38.833",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/015fb29a748342a186f37b602ac70017098c8251"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/a03d0c64cd827a622578623a78defd66b6593b82"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f6599d8830fe7ddab7334cc17846fd9ac9a7fa50"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    }
  }
}

FKIE_CVE-2026-98845

Vulnerability from fkie_nvd - Published: 2026-10-18 16:17 - Updated: 2026-10-18 16:17

Severity

Summary

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/015fb29a748342a186f37b602ac70017098c8251
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a03d0c64cd827a622578623a78defd66b6593b82
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/f6599d8830fe7ddab7334cc17846fd9ac9a7fa50

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-sessions.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "a03d0c64cd827a622578623a78defd66b6593b82",
              "status": "affected",
              "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
              "versionType": "git"
            },
            {
              "lessThan": "96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa",
              "status": "affected",
              "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
              "versionType": "git"
            },
            {
              "lessThan": "f6599d8830fe7ddab7334cc17846fd9ac9a7fa50",
              "status": "affected",
              "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
              "versionType": "git"
            },
            {
              "lessThan": "015fb29a748342a186f37b602ac70017098c8251",
              "status": "affected",
              "version": "cc7d8594342a25693d40fe96f97e5c6c29ee609c",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "294984ce51c19c2af3d0d71e1c8bd589bc86b8e2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "386c7cc6c06d64cbf36d15c5e2319814765e107c",
              "versionType": "git"
            },
            {
              "lessThan": "6.12",
              "status": "affected",
              "version": "6.11.7",
              "versionType": "semver"
            },
            {
              "lessThan": "6.12",
              "status": "affected",
              "version": "6.11.10",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-sessions.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.12"
            },
            {
              "lessThan": "6.12",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc6",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: Disable TPM on null key name mismatch\n\nThe null key name check exists to protect against TPM reset attacks, so\na mismatch should stop the device from serving further requests.\nCurrently it does not disable the chip when it finds a mismatch.\n\nThe mismatch is logged:\n\n    tpm tpm0: null key integrity check failed\n\nbut the chip keeps serving commands:\n\n    / # tpm2_getcap -c properties-fixed\n    TPM_PT_FAMILY_INDICATOR:\n      as UINT32:                0x08322e3000\n      as string:                \"2.0\"\n    ...\n\ntpm2_load_null() where the null key name check is run sets the chip as\ndisabled only if the rc is non zero. When the mismatch is seen, rc is\nzero at that point and it returns success. The other issue is that the\ncaller expects the null key handle to be populated when the function\nreturns 0 which it does here without writing the handle and proceeds\nassuming the null key handle is valid.\n\nDuring the test, I noticed that tpm2_start_auth_session() uses the\nuninitialized stack value as the key handle since tpm2_load_null()\nreturns 0 despite the integrity failure and proceeds with\nTPM2_CC_START_AUTH_SESS with this value as salt key handle.\n\nSet rc to -ENODEV on the mismatch. The error path then disables the chip\nand returns the correct code to the caller.\n\nTested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making\nTPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name\nof the re-created null key. The chip is now disabled on the mismatch."
    }
  ],
  "id": "CVE-2026-98845",
  "lastModified": "2026-10-18T16:17:38.833",
  "metrics": {},
  "published": "2026-10-18T16:17:38.833",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/015fb29a748342a186f37b602ac70017098c8251"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/a03d0c64cd827a622578623a78defd66b6593b82"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f6599d8830fe7ddab7334cc17846fd9ac9a7fa50"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

GHSA-G3P5-HGWR-RQX7

Vulnerability from github – Published: 2026-10-18 18:32 – Updated: 2026-10-18 18:32

Details

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

tpm: Disable TPM on null key name mismatch

The null key name check exists to protect against TPM reset attacks, so a mismatch should stop the device from serving further requests. Currently it does not disable the chip when it finds a mismatch.

The mismatch is logged:

tpm tpm0: null key integrity check failed

but the chip keeps serving commands:

/ # tpm2_getcap -c properties-fixed
TPM_PT_FAMILY_INDICATOR:
  as UINT32:                0x08322e3000
  as string:                "2.0"
...

tpm2_load_null() where the null key name check is run sets the chip as disabled only if the rc is non zero. When the mismatch is seen, rc is zero at that point and it returns success. The other issue is that the caller expects the null key handle to be populated when the function returns 0 which it does here without writing the handle and proceeds assuming the null key handle is valid.

During the test, I noticed that tpm2_start_auth_session() uses the uninitialized stack value as the key handle since tpm2_load_null() returns 0 despite the integrity failure and proceeds with TPM2_CC_START_AUTH_SESS with this value as salt key handle.

Set rc to -ENODEV on the mismatch. The error path then disables the chip and returns the correct code to the caller.

Tested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making TPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name of the re-created null key. The chip is now disabled on the mismatch.

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98845"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:38Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: Disable TPM on null key name mismatch\n\nThe null key name check exists to protect against TPM reset attacks, so\na mismatch should stop the device from serving further requests.\nCurrently it does not disable the chip when it finds a mismatch.\n\nThe mismatch is logged:\n\n    tpm tpm0: null key integrity check failed\n\nbut the chip keeps serving commands:\n\n    / # tpm2_getcap -c properties-fixed\n    TPM_PT_FAMILY_INDICATOR:\n      as UINT32:                0x08322e3000\n      as string:                \"2.0\"\n    ...\n\ntpm2_load_null() where the null key name check is run sets the chip as\ndisabled only if the rc is non zero. When the mismatch is seen, rc is\nzero at that point and it returns success. The other issue is that the\ncaller expects the null key handle to be populated when the function\nreturns 0 which it does here without writing the handle and proceeds\nassuming the null key handle is valid.\n\nDuring the test, I noticed that tpm2_start_auth_session() uses the\nuninitialized stack value as the key handle since tpm2_load_null()\nreturns 0 despite the integrity failure and proceeds with\nTPM2_CC_START_AUTH_SESS with this value as salt key handle.\n\nSet rc to -ENODEV on the mismatch. The error path then disables the chip\nand returns the correct code to the caller.\n\nTested in QEMU with swtpm and CONFIG_TCG_TPM2_HMAC=y by making\nTPM2_CC_CONTEXT_LOAD fail with TPM2_RC_INTEGRITY and changing the name\nof the re-created null key. The chip is now disabled on the mismatch.",
  "id": "GHSA-g3p5-hgwr-rqx7",
  "modified": "2026-10-18T18:32:05Z",
  "published": "2026-10-18T18:32:05Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98845"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/015fb29a748342a186f37b602ac70017098c8251"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/96c46c75b0d470b4204f9fe1bdb075cd2ebaebfa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a03d0c64cd827a622578623a78defd66b6593b82"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6599d8830fe7ddab7334cc17846fd9ac9a7fa50"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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CVE-2026-98845 (GCVE-0-2026-98845)

FKIE_CVE-2026-98845

GHSA-G3P5-HGWR-RQX7

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