CVE-2026-15390 Out-of-bounds write in Das U-Boot
An attacker can execute arbitrary code by sending fragmented IP packets to systems running Das U-Boot with IP defragmentation enabled.
- 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-2026-15390?
CVE-2026-15390 is a critical memory corruption vulnerability in DENX Software Engineering Das 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
Das U-Boot with CONFIG_IP_DEFRAG=y parameter fails to clear IP reassembly state after delivering a complete datagram. An attacker who can deliver fragmented IP traffic can execute arbitrary code by sending duplicated last-fragment IP packets.
This issue was fixed in commit b1aec609bb5e0d08c25c888c91935287ab4ee5fa in version 2026.07.
Which versions are affected by CVE-2026-15390?
How do I fix CVE-2026-15390?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-15390 being exploited?
There is no known exploitation of CVE-2026-15390 in the wild and no public exploit code.
Sources
Also known as AZL-105729, DEBIAN-CVE-2026-15390, GHSA-vm4x-pmjm-j3wm, UBUNTU-CVE-2026-15390.