tools/power/x86/intel-speed-select: Harden daemon pidfile open

published 2026-08-28 2 mo ago modified 2026-10-16 23 d ago also EUVD-2026-67539

cvss: 7.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.1%; EPSS 0.1% chance of exploitation in 30 days, percentile 2%
public exploits: 0; none known

In the Linux kernel, the following vulnerability has been resolved:

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.

Patch / fix

fixed in 1 distros 4 links 6

Linux Linux 6.1.178, 6.6.145, 6.12.97, 6.18.40, 7.1.5, 7.2

debian ubuntu suse opensuse

linux Debian 12 6.1.180-1
linux Debian 13 6.12.100-1
linux Debian 14 7.1.5-1

debian advisories DEBIAN-CVE-2026-80663

linux Ubuntu 24.04 LTS 6.8.0-147.147
linux Ubuntu 26.04 LTS 7.0.0-38.38
linux-aws Ubuntu 24.04 LTS 6.8.0-1067.70
linux-aws Ubuntu 26.04 LTS 7.0.0-1014.14
linux-gcp Ubuntu 24.04 LTS 6.8.0-1071.79
linux-gcp Ubuntu 26.04 LTS 7.0.0-1014.14
linux-gke Ubuntu 24.04 LTS 6.8.0-1066.74
linux-gke Ubuntu 26.04 LTS 7.0.0-1008.9

ubuntu advisories UBUNTU-CVE-2026-80663

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

cpupower SLE Module for Basesystem 15 SP7 6.4.0-150700.9.6.2
cpupower SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.3.1
kernel-64kb SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
kernel-syms SLE Module for Development Tools 15 SP7 6.4.0-150700.53.84.1
kernel-azure SLE Module for Public Cloud 15 SP7 6.4.0-150700.53.84.1
kernel-source SLE Module for Development Tools 15 SP7, SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1
kernel-default SLE Workstation Extension 15 SP7, SLE Module for Legacy 15 SP7, SLE Module for Basesystem 15 SP7 +2 more 6.4.0-150700.53.84.1
kernel-zfcpdump SLE Module for Basesystem 15 SP7 6.4.0-150700.53.84.1

suse advisories SUSE-SU-2026:5123-1 SUSE-SU-2026:4890-1 SUSE-SU-2026:24362-1 SUSE-SU-2026:24408-1 SUSE-SU-2026:4706-1 SUSE-SU-2026:4660-1

cpupower openSUSE Leap 16.0 6.12.0-160000.3.1

opensuse advisories openSUSE-SU-2026:22155-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-80663 updated 2026-11-07 cvss 7.1

kernel: tools/power/x86/intel-speed-select: Harden daemon pidfile open

Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
affected: workaround, no fix available
Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 23 d ago (2026-10-16)

Exploit prediction

0.13% chance of exploitation in the next 30 days, higher than 2% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	7.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

Affected products

Linux Linux

Classification

Technology feeds

Linux kernel rss critical rss

References

Sources

CVE List CVE-2026-80663
NVD CVE-2026-80663

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary