UBUNTU-CVE-2026-80562: Medium severity ubuntu/linux vulnerability
In the Linux kernel, the following vulnerability has been resolved: gpio: ml-ioh: use rawspinlockt for the register lock iohirqtype() is registered as the irqchip .irqsettype callback and takes chip->spinlock with spinlockirqsave(). This callback is reached from setupirq() -> irqsettrigger() -> chip->irqsettype() while the caller holds desc->lock, a rawspinlockt, with hardirqs disabled. That context is not sleepable, but on PREEMPTRT a regular spinlockt is an rtmutex-backed sleeping lock, so acquiring it there is invalid. iohirqenable() and iohirqdisable() take the same lock from the .irqenable/.irqdisable callbacks, which are likewise invoked with desc->lock held. Convert the register lock to rawspinlockt. The same lock also serializes the GPIO direction/value callbacks and the suspend/resume register save/restore, and those critical sections only perform short sequences of MMIO register accesses (ioread32()/iowrite32()); the .irqsettype callback additionally emits a devwarn() on an unsupported type. None of these are sleepable operations, so keeping this register lock non-sleeping is appropriate for the irqchip callbacks and does not change the GPIO-side locking contract. This is the same fix as commit a02b8950d619 ("gpio: pch: use rawspinlockt for the register lock"); this driver shares the same structure as gpio-pch.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
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Convert the register lock from spinlock_t to raw_spinlock_t so irqchip callbacks can acquire it safely in non-sleepable contexts, including PREEMPT_RT.
Linux kernel gpio: ml-ioh driver register lock type = raw_spinlock_t
Event History
Frequently Asked Questions
Which systems are most likely exposed to the invalid locking context?
The problematic paths are the ML-IOH GPIO driver's IRQ callbacks, particularly irq_set_type, irq_enable, and irq_disable. The issue is specifically relevant on PREEMPT_RT, where a regular spinlock_t can be implemented as a sleeping rtmutex while these callbacks run with a raw IRQ descriptor lock held and hard interrupts disabled.
Which Ubuntu kernel package families are identified by the advisory?
The advisory lists ubuntu/linux, ubuntu/linux-fips, ubuntu/linux-aws, ubuntu/linux-azure, ubuntu/linux-gcp, and the AWS, Azure, and GCP FIPS kernel variants. It does not provide affected or fixed version numbers in the supplied data.
Are GPIO and power-management operations involved in the same locking domain?
Yes. The register lock also serializes GPIO direction and value callbacks and suspend/resume register save and restore operations. Those paths perform short MMIO register access sequences, which the fix describes as appropriate for a non-sleeping raw spinlock.