CVE-2026-63798 irqchip/imgpdc: Fix resource leak, add missing chained handler cleanup on remove

What is CVE-2026-63798?

CVE-2026-63798 is a medium-severity use after free vulnerability in Linux kernel, published on 19 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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()

Weakness: CWE-401

Which versions are affected by CVE-2026-63798?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2026-63798?

Apply the vendor's patch.

Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.

Is CVE-2026-63798 being exploited?

There is no known exploitation of CVE-2026-63798 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2026-63798, DEBIAN-CVE-2026-63798, GHSA-2332-q5fp-53mf, ROOT-OS-DEBIAN-11-CVE-2026-63798, ROOT-OS-UBUNTU-2204-CVE-2026-63798, UBUNTU-CVE-2026-63798.