CVE-2026-80627

Technical Description

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

MIPS: mm: Fix out-of-bounds write in maar_res_walk()

maar_res_walk() uses wi->num_cfg as the index into the fixed-size

wi->cfg array, but checks whether the array is full only after it has

filled the selected entry. If walk_system_ram_range() reports more than

16 memory ranges, the overflow call writes one struct maar_config past

the end of the array before WARN_ON() prevents num_cfg from advancing.

Move the full-array check before taking the array slot and return non-zero

when the scratch array is full, so walk_system_ram_range() terminates the

walk instead of invoking the callback for further ranges.

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