CVE-2026-80723

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux9a0fe62f93ede02c27aaca81112af1e59c8c0979 < 68d27250c9e81ab7764603e346c2b1017cb53adfaffected
LinuxLinux8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < cfa7e2734877330d6c10e0f33953905486c4530caffected
LinuxLinux8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < de8ccbd6bf4efe7a059e2c483789936009e10f42affected
LinuxLinux8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 < db3dbdfea1b8f38774419c5c2c14e4b81c48708daffected
LinuxLinux6.12.13 < 6.12.103affected
LinuxLinux6.13affected
LinuxLinux0 < 6.13unaffected
LinuxLinux6.12.103 <= 6.12.*unaffected
LinuxLinux6.18.44 <= 6.18.*unaffected
LinuxLinux7.1.8 <= 7.1.*unaffected
LinuxLinux7.2 <= *unaffected

Weaknesses

References