CVE-2026-29004: Red Hat Enterprise Linux 6

High severity, CVSS 8.1. EPSS: 0.6% chance of exploitation in the next 30 days.

BusyBox before commit 42202bf contains a heap buffer overflow vulnerability in the DHCPv6 client (udhcpc6) DNS_SERVERS option handler in networking/udhcp/d6_dhcpc.c that allows network-adjacent attackers to trigger memory corruption by sending a crafted DHCPv6 response with a malformed D6_OPT_DNS_SERVERS option. Attackers can exploit incorrect heap buffer allocation calculations in the option_to_env() function to cause denial of service or achieve arbitrary code execution on embedded systems without heap hardening.

Affected products

• Red Hat Red Hat Enterprise Linux 6
• Red Hat Red Hat Hardened Images: before 1.37.0-7.3.hum1 (fixed in 1.37.0-7.3.hum1)
• Vda-Linux Busybox Mirror

Published 2026-05-04. Last modified 2026-07-15.