CVE-2026-90120 irqchip/gic-v5: Check get_logical_index() return value in MADT IAFFID parsing
A missing return value check in the Linux kernel GICv5 driver allows out-of-bounds memory corruption, potentially enabling code execution or privilege escalation.
- 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-2026-90120?
CVE-2026-90120 is a high-severity memory corruption 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/gic-v5: Check get_logical_index() return value in MADT IAFFID parsing
In gic_acpi_parse_iaffid() a given MADT GICC entry might not correspond to a logical cpu recognized by the kernel, resulting in the cpu variable initialization to an error value.
Currently, the get_logical_index() return value is not checked for failure, which might result in out-of-bounds memory corruption while trying to index a per_cpu variable array.
Add a check to evaluate get_logical_index() return value.
Which versions are affected by CVE-2026-90120?
How do I fix CVE-2026-90120?
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-2026-90120 being exploited?
There is no known exploitation of CVE-2026-90120 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-90120, GHSA-rfj6-7g8r-3866, UBUNTU-CVE-2026-90120.