This page tracks the Ubuntu fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-71971 →
UBUNTU-CVE-2026-71971
U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c....
Original description
The description as published by the source.
U-Boot before 2026.10-rc3 with CONFIG_IP_DEFRAG enabled contains an out-of-bounds write vulnerability in the __net_defragment() function in net/net.c. Remote attackers can send a crafted IP fragment with non-zero offset and More-Fragments flag set during netboot to corrupt adjacent memory and crash the bootloader.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Ubuntu:Pro:16.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2016.01+dfsg1-2ubuntu5+esm1"}]}]
Ubuntu:Pro:18.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2020.10+dfsg-1ubuntu0~18.04.3+esm1"}]}]
Ubuntu:Pro:20.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2021.01+dfsg-3ubuntu0~20.04.6+esm1"}]}]
Ubuntu:22.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2022.01+dfsg-2ubuntu2.8"}]}]
Ubuntu:22.04:LTS
u-boot-nezha
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:24.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu0.24.04.3"}]}]
Ubuntu:24.04:LTS
u-boot-nezha
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Ubuntu:26.10
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu5"}]}]
Ubuntu:26.04:LTS
u-boot
[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2025.10-0ubuntu2.1"}]}]
References
- advisory ubuntu.com
- report ubuntu.com
- report cve.org
- report github.com
- report github.com
- report github.com
- report vulncheck.com