CVE-2026-29004 (GCVE-0-2026-29004)

Vulnerability from cvelistv5 – Published: 2026-05-04 18:05 – Updated: 2026-07-15 01:10 X_Open Source
VLAI
Title
BusyBox DHCPv6 Client Heap Buffer Overflow via DNS_SERVERS
Summary
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.
Severity
7.2 (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
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-06 13:46 UTC
CWE
  • CWE-122 - Heap-based Buffer Overflow
  • CWE-131 - Incorrect Calculation of Buffer Size
Assigner
VulnCheck CNA under the mitre root
CNA scorecard B 84/100 over 7426 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
vda-linux busybox_mirror Affected: 0 , < 42202bfb1e6ac51fa995beda8be4d7b654aeee2a (git)
guessed Create a notification for this product.
Red Hat Red Hat Hardened Images Unaffected: 1.37.0-7.3.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
Create a notification for this product.
Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
Create a notification for this product.
Date Public
2026-03-12 00:00
Credits
Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc. VulnCheck
Show details on NVD website
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}



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