High severity7.1NVD Advisory· Published Sep 29, 2026

CVE-2026-74225

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.

Affected products

U Boot/U Bootllm-fuzzy
Range: <2026.10-rc5

Patches

Vulnerability mechanics

References

github.com/u-boot/u-boot/blob/v2026.07/net/dhcpv6.cnvd
github.com/u-boot/u-boot/commit/20209a62bc8565fc1e040882bc03c71ff0d73076nvd
www.vulncheck.com/advisories/u-boot-before-2026.10-rc5-out-of-bounds-write-via-dhcpv6nvd

News mentions

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cvss	0.461
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000