High severity8.2NVD Advisory· Published Sep 29, 2026

CVE-2026-71971

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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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

U Boot/U Bootllm-fuzzy
Range: <2026.10-rc3

Patches

Vulnerability mechanics

References

github.com/u-boot/u-boot/blob/v2026.07/net/net.cnvd
github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9nvd
www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassemblynvd

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cvss	0.533
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000