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CVE-2026-80723: of: reserved_mem: prevent OOB when too many dynamic regions are defined

• Severity: high (CVSS 8.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-28 · updated 2026-10-16

Description

In the Linux kernel, the following vulnerability has been resolved: of: reserved_mem: prevent OOB when too many dynamic regions are defined On boot, fdt_scan_reserved_mem() saves each dynamically-placed /reserved-memory subnode into a local array of size MAX_RESERVED_REGIONS. If the device tree defines more than MAX_RESERVED_REGIONS dynamically-placed regions, fdt_scan_reserved_mem() writes past the end of the local array. Add a bounds check that logs an error and skips the excess regions, restoring the original behavior.

Affected products

• Linux kernel: from 6.12.13 before 6.12.103; 6.13 — fixed in 6.12.103, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 6.12.103, 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/68d27250c9e81ab7764603e346c2b1017cb53adf
• https://git.kernel.org/stable/c/cfa7e2734877330d6c10e0f33953905486c4530c
• https://git.kernel.org/stable/c/db3dbdfea1b8f38774419c5c2c14e4b81c48708d
• https://git.kernel.org/stable/c/de8ccbd6bf4efe7a059e2c483789936009e10f42

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