U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly

Advisories

U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly

severity: high
date: 9/29/2026
Affecting: u-boot >= 0, < 2026.10-rc3
CVE: CVE-2026-71971
CWE: CWE-787 Out-of-bounds Write
CVSS: 8.8
CVSS V4 Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N
References: https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9
https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975
https://github.com/u-boot/u-boot
Credit: Shahriyar Jalayeri (ByteRay Ltd.), Mehrun P. Hunter (ByteRay Ltd.)
Description: 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.

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