CVE-2026-74225 U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6
Attackers can send crafted DHCPv6 packets to corrupt memory and crash the U-Boot bootloader during netboot, potentially enabling code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-74225?
CVE-2026-74225 is a high-severity memory corruption vulnerability in u-boot, published on 29 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.
Weakness: CWE-787
Which versions are affected by CVE-2026-74225?
How do I fix CVE-2026-74225?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-74225 being exploited?
There is no known exploitation of CVE-2026-74225 in the wild and no public exploit code.
Sources
Also known as DEBIAN-CVE-2026-74225, GHSA-c478-wgg8-3gvq, UBUNTU-CVE-2026-74225.