CVE-2026-90341

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

firmware: coreboot: Validate table bounds

The existing coreboot_table_populate() bounds checks limit individual

entries to the mapped length. However, coreboot_table_probe() replaces

the platform resource length with header and table sizes supplied by

firmware before mapping the full table.

A malformed table can overflow the 32-bit size addition or advertise an

extent beyond the resource, causing the driver to map and parse memory

outside the resource. A resource shorter than the fixed header is also

mapped as though it contained a complete header.

Reject resources shorter than the fixed header. After validating the

signature, require a complete header, calculate the advertised extent

with overflow checking, and reject extents beyond the resource before

remapping the table.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References