CVE-2026-63798

In the Linux kernel, the following vulnerability has been resolved:

irqchip/imgpdc: Fix resource leak, add missing chained handler cleanup on remove

The driver allocates domain generic chips using

irq_alloc_domain_generic_chips() during probe and sets up chained

handlers using irq_set_chained_handler_and_data(). However, on driver

removal, the generic chips are not freed and the chained handlers are

not removed.

The generic chips remain on the global gc_list and may later be accessed by

generic interrupt chip suspend, resume, or shutdown callbacks after the

driver has been removed, potentially resulting in a use-after-free and

kernel crash.

The chained handlers that were installed in probe for peripheral and

syswake interrupts are also left dangling, which can lead to spurious

interrupts accessing freed memory.

Fix these issues by:

- Setting IRQ_DOMAIN_FLAG_DESTROY_GC flag in domain->flags, so the

core code automatically removes generic chips when irq_domain_remove()

is called

- Clearing all chained handlers with NULL in pdc_intc_remove()