PT-2026-27697 · Linux+1 · Linux Kernel+1

Published 2026-01-01 · Updated 2026-03-27 · CVE-2026-23332

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description A flaw exists in the Linux kernel's cpufreq subsystem, specifically within the intel pstate driver. Disabling turbo boost via /sys/devices/system/cpu/intel pstate/no turbo can lead to a system crash when the kernel is booted with command-line arguments like "nosmt" or "maxcpus" that limit the number of CPUs. This is due to a NULL pointer dereference occurring when for each possible cpu() returns CPUs that are not online, and all cpu data[] is subsequently dereferenced. The issue arises from accessing all cpu data[] for CPUs without a valid cpufreq policy. The crash manifests as a supervisor read access error in kernel mode.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-23332

Affected Products

Linux Kernel

Intel Pstate

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/23xxx/CVE-2026-23332.json · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-23332 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-23332 · Vendor Advisory
• https://git.kernel.org/stable/c/a1850e2aef4d15405e7ff53fd51c4b3124d46182 · Patch
• https://ubuntu.com/security/CVE-2026-23332 · Vendor Advisory
• https://git.kernel.org/stable/c/6b050482ec40569429d963ac52afa878691b04c9 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-23332 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-23332 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-23332 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-23332 · Vendor Advisory
• https://git.kernel.org/stable/c/d20d48916ce8531b157c2edeba76d69af2974270 · Patch
• https://twitter.com/CVEarity/status/2037571183898718285 · Twitter Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://twitter.com/CVEnew/status/2036763516955156883 · Twitter Post
• https://git.kernel.org/linus/6b050482ec40569429d963ac52afa878691b04c9 · Note