U-Boot <2026.10-rc3 IP_DEFRAG OOBW in __net_defragment()
CVE-2026-71971 Published on September 29, 2026
U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
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.
Vulnerability Analysis
CVE-2026-71971 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Memory Corruption Vulnerability?
The software writes data past the end, or before the beginning, of the intended buffer. Typically, this can result in corruption of data, a crash, or code execution. The software may modify an index or perform pointer arithmetic that references a memory location that is outside of the boundaries of the buffer. A subsequent write operation then produces undefined or unexpected results.
CVE-2026-71971 has been classified to as a Memory Corruption vulnerability or weakness.
Products Associated with CVE-2026-71971
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Affected Versions
u-boot:- Before 2026.10-rc3 is affected.