CVE-2026-63798

What the bug is

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()

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/irqchip/irq-imgpdc.c

What this is

IRQCHIP DRIVERSMAINTAINERS section matched on drivers/irqchip/ · linux-kernel@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into irq_imgpdc, and Debian does not compile it into that module, so finding irq_imgpdc in lsmod would say nothing about this CVE.

Check it on the machine

grep -w CONFIG_IMGPDC_IRQ /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 4 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sidn

n

not enabled on any flavour - this release does not build the code

Build switch

CONFIG_IMGPDC_IRQ

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-07-19 (3 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.13%, higher than 2.1% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/irqchip

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
3.12	5.10.260	8176773dfcea
3.12	5.15.211	c2c7733101bb
3.12	6.1.177	83d7ec14b093
3.12	6.6.144	44567537a262
3.12	6.12.95	41826e5297e6
3.12	6.18.38	b3a3831b2eb8
3.12	7.1.3	0405a65e4ebd
3.12	7.2	37738fdf2ab1

Debian advisories