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Linux kernel 6.6.157.1-1 Samsung timer lock can freeze system
published 1 month ago
Summary
The Linux kernel version 6.6.157.1-1 has a problem with the Samsung PWM timer when the real‑time option is turned on. In that configuration the lock used by the timer could cause the system to stop responding during interrupt handling. Install the updated kernel that switches the lock to a safe type to avoid these freezes.
What to do
The CVE record does not list a fixed version. Check the vendor's site or the advisory links below - a fix may already be released.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Azure Linux:3 | – | kernel | <= 6.6.157.1-1 |
| Azure Linux:3 | azure | kernel | <= 6.6.150.1-1 |
Original advisory text
CVE-2026-90208 affecting package kernel 6.6.157.1-1
In the Linux kernel, the following vulnerability has been resolved:
clocksource/drivers/samsung_pwm: Switch to raw_spinlock_t type
Samsung PWM timer might be used as a clock source on some legacy systems.
When PREEMPT_RT is enabled on ARM, regular spinlock is converted to a
sleeping lock (mutex-based), which must not be used in atomic context
such as hard interrupt handlers. Switch the samsung_pwm_lock to the
raw_spinlock, which remains a true non-sleeping spinlock even
under PREEMPT_RT.
clocksource/drivers/samsung_pwm: Switch to raw_spinlock_t type
Samsung PWM timer might be used as a clock source on some legacy systems.
When PREEMPT_RT is enabled on ARM, regular spinlock is converted to a
sleeping lock (mutex-based), which must not be used in atomic context
such as hard interrupt handlers. Switch the samsung_pwm_lock to the
raw_spinlock, which remains a true non-sleeping spinlock even
under PREEMPT_RT.
References
Timeline
Published17 Sep 2026
Updated24 Sep 2026
First seen23 Sep 2026
Sources
AZL-103020 · OSV
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