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CVE-2026-98728

Status: ReceivedUnscored—
Severity—Unscored
Exploitation probability0.17 %higher than 6% of CVEs
Active exploitationNonot in the CISA catalog
Public exploitNot knownno public code found

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.

CVSS

NVD hasn't assigned a CVSS score to this CVE (common since the April 2026 policy change).

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days
0.17 %
Percentile among all scored CVEs
6
Score date
10/20/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Linux — Linux KernelAI

References

Show 4 references

Raw JSON (NVD)

Show
{
  "id": "CVE-2026-98728",
  "cveTags": [],
  "metrics": {},
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "lessThan": "be54101992c2c5218be0e0a87827ccc96e3089af",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "lessThan": "e30a2406408d2df6d9cd48c2e59e913cf266a05a",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "lessThan": "42bb6216b861e892512128219ff23010d656ba14",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497",
              "lessThan": "9b522400bf5c082feb9a0037a053ea822a2c7e4d",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/char/tpm/tpm2-cmd.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.10",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.12.113",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.18.56",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.10",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/char/tpm/tpm2-cmd.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-10-18T16:17:26.430",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/e30a2406408d2df6d9cd48c2e59e913cf266a05a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "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's random bytes.\n\nFix this by checking the response length against 'offset', which\nalready includes the skipped parameter size field."
    }
  ],
  "lastModified": "2026-10-19T10:19:36.963",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}