CVE-2026-98728tpm: fix off-by-four bounds check in tpm2_get_random()
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 18, 2026
- First seen by InfoSec Signals
- Oct 18, 2026
Affected products
Linux Linux linux:linux (from the name) | from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 before be54101992c2c5218be0e0a87827ccc96e3089af; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 before e30a2406408d2df6d9cd48c2e59e913cf266a05a; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 before 42bb6216b861e892512128219ff23010d656ba14; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497 before 9b522400bf5c082feb9a0037a053ea822a2c7e4d | CNA record |
References
- https://git.kernel.org/stable/c/be54101992c2c5218be0e0a87827ccc96e3089af
- https://git.kernel.org/stable/c/e30a2406408d2df6d9cd48c2e59e913cf266a05a
- https://git.kernel.org/stable/c/42bb6216b861e892512128219ff23010d656ba14
- https://git.kernel.org/stable/c/9b522400bf5c082feb9a0037a053ea822a2c7e4d
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.