CVE-2026-90120irqchip/gic-v5: Check get_logical_index() return value in MADT IAFFID parsing

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/6caeb878f809bdf0aec2fdd96f3d41ef4b69fc69
• https://git.kernel.org/stable/c/328affc639ce9873a7a0a3fd6b8339f19767529b