Vulnerability-Lookup

GHSA-M4P2-CQR5-X7CX

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: fix off-by-four bounds check in tpm2_get_random()

When the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random() skips the 4-byte parameter size field before locating the random data, but the bounds check still validates the response length against TPM_HEADER_SIZE. A truncated response can pass the check and make memcpy() read up to 4 bytes past the response end, so stale buffer contents end up in the caller's random bytes.

Fix this by checking the response length against 'offset', which already includes the skipped parameter size field.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98728"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-18T16:17:26Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntpm: fix off-by-four bounds check in tpm2_get_random()\n\nWhen the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random()\nskips the 4-byte parameter size field before locating the random data,\nbut the bounds check still validates the response length against\nTPM_HEADER_SIZE.  A truncated response can pass the check and make\nmemcpy() read up to 4 bytes past the response end, so stale buffer\ncontents end up in the caller\u0027s random bytes.\n\nFix this by checking the response length against \u0027offset\u0027, which\nalready includes the skipped parameter size field.",
  "id": "GHSA-m4p2-cqr5-x7cx",
  "modified": "2026-10-18T18:32:01Z",
  "published": "2026-10-18T18:32:01Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98728"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e30a2406408d2df6d9cd48c2e59e913cf266a05a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

CVE-2026-98728 (GCVE-0-2026-98728)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:47 – Updated: 2026-10-19 09:24

Title

tpm: fix off-by-four bounds check in tpm2_get_random()

Summary

In the Linux kernel, the following vulnerability has been resolved: tpm: fix off-by-four bounds check in tpm2_get_random() When the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random() skips the 4-byte parameter size field before locating the random data, but the bounds check still validates the response length against TPM_HEADER_SIZE. A truncated response can pass the check and make memcpy() read up to 4 bytes past the response end, so stale buffer contents end up in the caller's random bytes. Fix this by checking the response length against 'offset', which already includes the skipped parameter size field.

Severity

No CVSS data available.

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6971 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/be54101992c2c5218…
https://git.kernel.org/stable/c/e30a2406408d2df6d…
https://git.kernel.org/stable/c/42bb6216b861e8925…
https://git.kernel.org/stable/c/9b522400bf5c082fe…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 , < be54101992c2c5218be0e0a87827ccc96e3089af (git) Affected: 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 , < e30a2406408d2df6d9cd48c2e59e913cf266a05a (git) Affected: 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 , < 42bb6216b861e892512128219ff23010d656ba14 (git) Affected: 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 , < 9b522400bf5c082feb9a0037a053ea822a2c7e4d (git)
Linux	Linux	Affected: 6.10 Unaffected: 0 , < 6.10 (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 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-cmd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "be54101992c2c5218be0e0a87827ccc96e3089af",
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "versionType": "git"
            },
            {
              "lessThan": "e30a2406408d2df6d9cd48c2e59e913cf266a05a",
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "versionType": "git"
            },
            {
              "lessThan": "42bb6216b861e892512128219ff23010d656ba14",
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "versionType": "git"
            },
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              "status": "affected",
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              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/char/tpm/tpm2-cmd.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "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",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.113",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.56",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                }
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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: fix off-by-four bounds check in tpm2_get_random()\n\nWhen the response carries the TPM2_ST_SESSIONS tag, tpm2_get_random()\nskips the 4-byte parameter size field before locating the random data,\nbut the bounds check still validates the response length against\nTPM_HEADER_SIZE.  A truncated response can pass the check and make\nmemcpy() read up to 4 bytes past the response end, so stale buffer\ncontents end up in the caller\u0027s random bytes.\n\nFix this by checking the response length against \u0027offset\u0027, which\nalready includes the skipped parameter size field."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:24:38.853Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af"
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          "url": "https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14"
        },
        {
          "url": "https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d"
        }
      ],
      "title": "tpm: fix off-by-four bounds check in tpm2_get_random()",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98728",
    "datePublished": "2026-10-18T15:47:05.722Z",
    "dateReserved": "2026-09-25T10:25:14.366Z",
    "dateUpdated": "2026-10-19T09:24:38.853Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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