CVE-2026-71971
U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassembly
- State
- Published
- Severity
- 8.8 High
- Published
- Sep 29, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 8, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.8 High | 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 | VulnCheck |
| 3.1 | 8.2 High | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H | VulnCheck |
Weaknesses
- CWE-787 Out-of-bounds Write
Affected Products
| Product | Versions |
|---|---|
u-bootu-boot |
|
References
- https://github.com/u-boot/u-boot/commit/04ca915d5bf39dda5d1bce62d04d2b59d293c5b9patch
- https://github.com/u-boot/u-boot/blob/v2026.07/net/net.c#L975technical-description
- https://github.com/u-boot/u-bootproduct
- VulnCheck Advisory: U-Boot before 2026.10-rc3 Out-of-Bounds Write in IP Fragment Reassemblythird-party-advisory
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