---
id: CVE-2026-80663
title: |-
  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 fst…
summary: |-
  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 fst…
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H'
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80663'
references:
  - url: 'https://git.kernel.org/stable/c/19ffeb30fdfce63f8d6aca71bcdddb3f69d46278'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/607af438e6430893a822964c841a1994b33acccc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/72a07abc6b9046f07a08bba353cad7667bcc9dce'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/905493a6338c82a70da16f86e0a6215db5a3d73d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/db938eb9a3c1317596c28e94413b33426508d51b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e8adac69d1bdf035ef97cc914e845acd4ef08e28'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00126
epssPercentile: 0.02627
ingestedAt: '2026-08-30T04:47:09.832Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.