Linux KERNEL OOB in fdt_scan_reserved_mem for excessive reservedmemory regions
CVE-2026-80723 Published on August 28, 2026
of: reserved_mem: prevent OOB when too many dynamic regions are defined
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.
Products Associated with CVE-2026-80723
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Affected Versions
Linux:- Version 9a0fe62f93ede02c27aaca81112af1e59c8c0979 and below 68d27250c9e81ab7764603e346c2b1017cb53adf is affected.
- Version 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 and below cfa7e2734877330d6c10e0f33953905486c4530c is affected.
- Version 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 and below de8ccbd6bf4efe7a059e2c483789936009e10f42 is affected.
- Version 8a6e02d0c00e7b62e6acb74146878bb91e9e7e31 and below db3dbdfea1b8f38774419c5c2c14e4b81c48708d is affected.
- Version 6.12.13 and below 6.12.103 is affected.
- Version 6.13 is affected.
- Before 6.13 is unaffected.
- Version 6.12.103, <= 6.12.* is unaffected.
- Version 6.18.44, <= 6.18.* is unaffected.
- Version 7.1.8, <= 7.1.* is unaffected.
- Version 7.2, <= * is unaffected.