Linux Kernel Vulnerability: GPIO Register Lock Issue

CVE-2026-80562

What is CVE-2026-80562?

A vulnerability in the Linux kernel's GPIO interface stems from improper locking mechanisms within the irq_chip callbacks, particularly the irq_set_type function. The use of a standard spinlock in a non-sleepable context can lead to deadlocks, as these locks can put the system in a sleep state when they shouldn't. This critical section involves GPIO direction/value operations that should remain non-sleeping, necessitating the conversion of the register lock to raw_spinlock_t. This corrects the potential for instability and ensures that GPIO callbacks perform efficiently without risking system performance or reliability. The fix aligns with previous solutions for similar vulnerabilities in gpio-pch structures.

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