The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - gpio: pch: use raw_spinlock_t for the register lock pch_irq_type() is registered as the irq_chip     .irq_set_type callback and takes chip->spinlock with spin_lock_irqsave(). This callback is reached from
    __setup_irq() -> __irq_set_trigger() -> chip->irq_set_type() while the caller holds desc->lock, a     raw_spinlock_t, with hardirqs disabled. That context is not sleepable, but on PREEMPT_RT a regular     spinlock_t is an rtmutex-backed sleeping lock, so acquiring it there is invalid. This was confirmed on a     PREEMPT_RT kernel with lockdep (PROVE_RAW_LOCK_NESTING and DEBUG_ATOMIC_SLEEP). A grounded PoC mirrored     pch_irq_type()'s locking and drove it through the real genirq carrier irq_set_irq_type() ->
    __irq_set_trigger() -> chip->irq_set_type(), i.e. the same __irq_set_trigger() edge that __setup_irq()     takes for a requested IRQ. With the original spin_lock_irqsave() edge lockdep reported an invalid wait     context, immediately followed by: BUG: sleeping function called from invalid context at     kernel/locking/spinlock_rt.c:48 in_atomic(): 1, irqs_disabled(): 1, non_block: 0, pid: 95, name: insmod     hardirqs last disabled at (3784): _raw_spin_lock_irqsave+0x4f/0x60 rt_spin_lock+0x3a/0x1c0     repro_irq_set_type+0x64/0xa0 [pch_repro] __irq_set_trigger+0x69/0x140 irq_set_irq_type+0x78/0xd0 Switching     the mirrored lock to raw_spinlock_t made both splats go away. Convert the register lock to raw_spinlock_t.
    The same lock also serializes the GPIO direction/value callbacks and the suspend/resume register     save/restore, but all of those critical sections only perform MMIO register accesses     (ioread32()/iowrite32()) and irq_set_handler_locked(); none of them contain sleepable operations. Keeping     this register lock non-sleeping is therefore appropriate for the irqchip callbacks and does not change the     GPIO-side locking contract. This is the same class of issue and fix as recently addressed for other GPIO     controllers, e.g. commit 286533cb14a3 (gpio: sch: use raw_spinlock_t in the irq startup path) and commit     90f0109019e6 (gpio: eic-sprd: use raw_spinlock_t in the irq startup path). (CVE-2026-74468)

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Linux Distros Unpatched Vulnerability : CVE-2026-74468

medium Nessus Plugin ID 335756

Version 1.3