Out-of-bounds write in Linux kernel - CVE-2026-80723
Published: August 28, 2026
Vulnerability identifier: #VU146057
CSH Severity: Low
CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80723
CWE-ID: CWE-787
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds write in fdt_scan_reserved_mem() when processing device tree reserved-memory subnodes during boot. A local attacker can supply a device tree with more than MAX_RESERVED_REGIONS dynamically-placed regions to cause a denial of service.
Exploitation requires control over the device tree used at boot.
Affected software
Linux kernel
How to mitigate CVE-2026-80723
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3