CVE-2026-72153 irqchip/crossbar: Use correct index in crossbar_domain_free()
A Linux kernel bug in the crossbar IRQ chip driver causes incorrect index usage, potentially leading to out-of-bounds memory access and system instability.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-72153?
CVE-2026-72153 is a memory corruption vulnerability in Linux, published on 15 Aug 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/crossbar: Use correct index in crossbar_domain_free()
crossbar_domain_free() resets the domain data and then uses the nulled out irq_data->hwirq member as index to reset the irq_map[] entry and to write the relevant crossbar register with a safe entry. That means it never frees the correct index and keeps the crossbar register connection to the source interrupt active.
If it would not reset the domain data, then this would be even worse as irq_data->hwirq holds the source interrupt number, but both the map and register index need the corresponding GIC SPI number and not the source interrupt number. This might even result in an out of bounds access as the source interrupt number can be higher than the maximal index space.
Fix this by using the GIC SPI index from the parent domain's irq_data.
Which versions are affected by CVE-2026-72153?
How do I fix CVE-2026-72153?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-72153 being exploited?
There is no known exploitation of CVE-2026-72153 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2026-72153, DEBIAN-CVE-2026-72153, GHSA-cjfc-rqm4-h9mg, UBUNTU-CVE-2026-72153.