What’s Vulnerable › Vulnerabilities

CVE-2026-80627: MIPS: mm: Fix out-of-bounds write in maar_res_walk()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-08-28

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.

Affected products

• Linux kernel: 5.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/038f068cced8e9c49e8c419f3112d909ad366a3a
• https://git.kernel.org/stable/c/1b001b16bc88f3f7817e228acfd91ee01bdcfcce
• https://git.kernel.org/stable/c/431812eb88c200bc3ec33b88782c8cc415842074
• https://git.kernel.org/stable/c/44c1d902cf0798b60762a7a98be992b9f5ded7dd
• https://git.kernel.org/stable/c/8b3e0c1c63015deaf084286899f5b2d0526715de
• https://git.kernel.org/stable/c/92f38fe85198ace9b211bc7712b7951acfb94560
• https://git.kernel.org/stable/c/a594100e147a6a67eb29189170f1df3645cda12b
• https://git.kernel.org/stable/c/ac7385af1dca86a5ea704c80ca4dc822083ff9e2

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