U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

Advisories

U-Boot before 2026.10-rc5 Out-of-Bounds Write via DHCPv6

severity: high
date: 9/29/2026
Affecting: u-boot >= 0, < 2026.10-rc5
CVE: CVE-2026-74225
CWE: CWE-787 Out-of-bounds Write
CVSS: 7.1
CVSS V4 Vector: 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
References: https://github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076
https://github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.c#L304
https://github.com/u-boot/u-boot
Credit: Shahriyar Jalayeri (ByteRay Ltd.), Mehrun P. Hunter (ByteRay Ltd.)
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.

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