Linux Kernel up to 7.2.5 irqchip/gic-v5 gic_acpi_parse_iaffid out-of-bounds

Summaryinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.5. This issue affects the function gic_acpi_parse_iaffid of the component irqchip/gic-v5. Executing a manipulation can lead to out-of-bounds. This vulnerability is registered as CVE-2026-90120. The attack needs to be launched locally. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as very critical was found in Linux Kernel up to 7.2.5. This vulnerability affects the function gic_acpi_parse_iaffid of the component irqchip/gic-v5. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability was named CVE-2026-90120 since 09/11/2026. The exploitation appears to be easy. Local access is required to approach this attack. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/17/2026).

Upgrading to version 7.2.6 or 7.3-rc1 eliminates this vulnerability. Applying the patch 6caeb878f809bdf0aec2fdd96f3d41ef4b69fc69/328affc639ce9873a7a0a3fd6b8339f19767529b is able to eliminate this problem. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 7.2.0
• 7.2.1
• 7.2.2
• 7.2.3
• 7.2.4
• 7.2.5

License

• open-source

Website

• Vendor: https://www.kernel.org/

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