CVE-2026-74225
U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6
- State
- Published
- Severity
- 7.1 High
- Published
- Sep 29, 2026
- Updated
- Sep 30, 2026
- Reserved
- Aug 14, 2026
Description
U-Boot before 2026.10-rc5 contains out-of-bounds memory access in dhcp6_parse_options() that fails to validate SERVERID and CLIENTID option lengths from DHCPv6 packets. Attackers on the local network can send crafted DHCPv6 ADVERTISE or REPLY packets during netboot to corrupt memory and crash the bootloader.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 7.1 High | CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:H/SC:N/SI:N/SA:N | VulnCheck |
| 3.1 | 7.1 High | CVSS:3.1/AV:A/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/20209a62bc8565fc1e040882bc03c71ff0d73076patch
- https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304technical-description
- https://github.com/u-boot/u-bootproduct
- VulnCheck Advisory: U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6third-party-advisory
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