CVE-2026-72153: irqchip/crossbar: Use correct index in crossbar_domain_free()
In the Linux kernel, the following vulnerability has been resolved:
irqchip/crossbar: Use correct index in crossbardomainfree()
crossbardomainfree() resets the domain data and then uses the nulled out irqdata->hwirq member as index to reset the irqmap[] 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 irqdata->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 irqdata.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
Linux kernel (irqchip/crossbar)to a version that resolves this vulnerability.Patch irqchip/crossbar: Use correct index in crossbar_domain_free()
Event History
Frequently Asked Questions
What is the severity of CVE-2026-72153?
The severity of CVE-2026-72153 is rated at risk level 34.
How do I fix CVE-2026-72153?
To fix CVE-2026-72153, ensure that you apply the latest patches for the Linux kernel that address this vulnerability.
What is the impact of CVE-2026-72153?
The impact of CVE-2026-72153 involves potential incorrect handling of interrupt requests due to improper index usage.
In which component of the Linux kernel is CVE-2026-72153 found?
CVE-2026-72153 is found in the irqchip/crossbar component of the Linux kernel.
When was CVE-2026-72153 published?
CVE-2026-72153 was published on August 15, 2026.