CVE-2026-71971

Summary

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.

Affected Software

Weaknesses

• CWE-787: Out-of-bounds Write

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
• https://www.vulncheck.com/advisories/u-boot-before-2026.10-rc3-out-of-bounds-write-in-ip-fragment-reassembly

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