CVE-2026-74468

A flaw was found in the Linux kernel's GPIO PCH driver. On systems configured with PREEMPT_RT, a local attacker could trigger a specific interrupt handler (pch_irq_type()) in a non-sleepable context. This improper use of a spinlock, which attempts to acquire a sleeping lock in an atomic context, can lead to a kernel panic and system instability.

Red Hat has rated this vulnerability as having a Moderate severity because exploitation requires local access and can result only in a denial of service through a system crash, without compromising confidentiality or integrity. The issue specifically targets the Platform Controller Hub GPIO driver on real-time configurations, requiring specific hardware to trigger. Furthermore, default Red Hat Enterprise Linux kernels do not enable or ship this driver, which significantly limits potential exposure.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.