CVE-2026-71971

EUVD-2026-89429
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
NISTPrimary
8.2 HIGH
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
Awaiting analysis
This vulnerability is currently awaiting analysis.
Base Score
CVSS 3.x
EPSS Score
Percentile: 31.95%
Debian logo
Debian Releases
Debian Product
Codename
u-boot
bookworm
vulnerable
bookworm (security)
vulnerable
forky
vulnerable
sid
vulnerable
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
u-boot
bionic
Fixed 2020.10+dfsg-1ubuntu0~18.04.3+esm1
released
focal
Fixed 2021.01+dfsg-3ubuntu0~20.04.6+esm1
released
jammy
Fixed 2022.01+dfsg-2ubuntu2.8
released
noble
Fixed 2025.10-0ubuntu0.24.04.3
released
resolute
Fixed 2025.10-0ubuntu2.1
released
xenial
Fixed 2016.01+dfsg1-2ubuntu5+esm1
released
u-boot-nezha
jammy
needs-triage
noble
needs-triage
resolute
dne
Common Weakness Enumeration
References
https://github.com/u-boot/u-boot
https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975
https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9
https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly