CVE-2026-93072 irqchip/renesas-irqc: Fix generic interrupt chip leak on remove

Not scored Published 17 Sep 2026 Updated 19 Oct 2026

A use-after-free in the Renesas IRQC driver can cause a kernel crash when the driver is removed, requiring local privileged access to trigger.

Exploited in the wild: Not known
Login needed: An administrator
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-93072?

CVE-2026-93072 is an use after free vulnerability in Linux, published on 17 Sep 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/renesas-irqc: Fix generic interrupt chip leak on remove

The driver allocates domain generic chips probe. However, on driver removal, the generic chips are not automatically freed when the interrupt domain is removed because the domain flags do not include IRQ_DOMAIN_FLAG_DESTROY_GC.

This causes both the domain generic chips structure and the associated generic chips to be leaked. Additionally, the generic chips remain on the global 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.

Fix the resource leak by setting IRQ_DOMAIN_FLAG_DESTROY_GC on the interrupt domain; this lets the interrupt domain core automatically release all generic chips when irq_domain_remove() is invoked, removing the need for manual cleanup calls in error paths and remove callback.

Which versions are affected by CVE-2026-93072?

How do I fix CVE-2026-93072?

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-2026-93072 being exploited?

There is no known exploitation of CVE-2026-93072 in the wild and no public exploit code.

Sources

Also known as AZL-102342, BELL-CVE-2026-93072, DEBIAN-CVE-2026-93072, GHSA-h6q6-g8xj-rf6w, UBUNTU-CVE-2026-93072.