BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS_CVE-2026-29004

7.2 / 10

HIGH

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N

Description

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.

Basic Information

ID CVE-2026-29004

Source VulnCheck

Published May 4, 2026 at 18:05

Affected Product

Vendor vda-linux

Product busybox_mirror

Affected Versions vda-linux busybox_mirror 0

CWE Classification

CWE-122

References

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    "published": "2026-05-04T18:05:18.962Z",
    "modified": "2026-05-04T18:05:18.962Z",
    "type": "cve",
    "title": "BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS",
    "source": "VulnCheck",
    "references": "https://github.com/vda-linux/busybox_mirror/commit/42202bfb1e6ac51fa995beda8be4d7b654aeee2a\nhttps://github.com/vda-linux/busybox_mirror/commit/d368f3f7836d1c2484c8f839316e5c93e76d4409\nhttps://busybox.net/\nhttps://www.vulncheck.com/advisories/busybox-dhcpv6-client-heap-buffer-overflow-via-dns-servers",
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