CVE-2026-71971
High
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.
SeverityHigh
CVSS8.2
Exploit probability—
ProductU-boot
PublishedSep 29, 2026
First seenSep 29, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- u-boot u-boot2026.10-rc3 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| u-boot u-boot | v < 2026.10-rc3 | 2026.10-rc3 |
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