PT-2026-37567 · Linux · Linux Kernel

Published 2026-05-06 · Updated 2026-05-08 · CVE-2026-43227

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 An issue exists in the TMU device driver, which serves as both a clocksource and a clockevent provider. The driver attempts to manage power and clock states dynamically; however, when the TMU registers itself via clockevents register device(), it operates within a context requiring raw spinlocks. Because the driver calls pm runtime *() and clk *() functions while holding a raw spinlock, and these functions subsequently call other platform drivers that use regular spinlocks, a conflict in spinlock contexts occurs. This specifically affects PREEMPT RT builds where normal spinlocks can sleep, leading to a lockdep warning and an invalid wait context.

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

Related Identifiers

CVE-2026-43227

Affected Products

Linux Kernel

References · 18

• https://git.kernel.org/stable/c/79d650695773f03de36b99228a090d33d1c18264 · Patch
• https://ubuntu.com/security/CVE-2026-43227 · Vendor Advisory
• https://git.kernel.org/stable/c/016476afef993d1201a19decc9b5b2ea1e6620f2 · Patch
• https://security-tracker.debian.org/tracker/CVE-2026-43227 · Vendor Advisory
• https://git.kernel.org/stable/c/88c76792180dffd83f1c5b9dc8fdaeb145cb94e0 · Patch
• https://git.kernel.org/stable/c/b1278972b08e480990e2789bdc6a7c918bc349be · Patch
• https://osv.dev/vulnerability/BELL-CVE-2026-43227 · Vendor Advisory
• https://git.kernel.org/stable/c/0e513cc6b9cea190fe342cc222b1054e7e8acfc8 · Patch
• https://git.kernel.org/stable/c/f0b31247e7d67a943b3a09d3cef7c0ae788d88e6 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43227 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43227 · Vendor Advisory
• https://git.kernel.org/stable/c/bc59d5f3afe41fec5d673c27c703b761ae578d28 · Patch
• https://git.kernel.org/stable/c/6f113ab549b864c1bc57d4f89846ee335394089a · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43227 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-43227 · Security Note