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TI-2026-79981 Aliases CVE-2026-115863

Stack-based buffer overflow in ConnMan DHCPv6 handling

Priority LOW 33CWE-121Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
—
Confidentiality · integrity · availability
Low · Low · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA.

Summary

ConnMan through 2.0 contains a stack-based buffer overflow (CWE-121) in its DHCPv6 handling. The code copies a fixed 1025 bytes from the DOMAIN_LIST option into a 1026-byte stack buffer regardless of the actual option length, and the DNS label walk then runs past the end of the buffer. An unauthenticated attacker on the same link can trigger it with a forged Router Advertisement and a forged DHCPv6 Reply, crashing connmand, which runs as root.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Description from the CNA

ConnMan through 2.0 has a stack-based buffer overflow via a DHCPv6 Reply message. This occurs in get_domains in gdhcp/client.c. It copies a fixed NS_MAXDNAME (1025) bytes from a DHCPv6 DOMAIN_LIST (option 24) value into a 1026-byte stack buffer dns_name regardless of the actual option length, then walks DNS labels with an unbounded "c += jump + 1" loop. A crafted DHCPv6 REPLY with a DOMAIN_LIST option of >= 1025 non-zero bytes makes the label walk leave the buffer and read/write '.' past its end in attacker-chosen strides. An on-link attacker can trigger this without authentication via a forged Router Advertisement (O=1) and a forged DHCPv6 REPLY matching xid/CLIENTID with a long DOMAIN_LIST. The impact is unauthenticated on-link crash of connmand (runs as root). This was introduced in bb06c47.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00299 22nd percentileScored 2026-11-08
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ConnManConnManup to 2.0—No fix listedCNA
  • ConnMan VendorConnMan Affected up to 2.0 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for ConnMan.

Written with Claude Haiku 5.5 from the sources below · 2026-11-02

Timeline

  1. 2026-10-23 Threatist record created from CVE-2026-115863
  2. 2026-10-24 Priority changed: MEDIUM → LOW
  3. 2026-11-02 CISA SSVC decision points changed

References

Advisory 1

Other 2

  • TI-2025-23798 In ConnMan through 1.44, the lookup string in ns_resolv in dnsproxy.c can be NULL or an… CVSS 3.1CRITICAL 9.0
  • TI-2012-02059 The loopback plug-in in ConnMan before 0.85 allows remote attackers to execute arbitrary… CVSS 2.0HIGH 10.0
  • TI-2012-02058 ConnMan before 0.85 does not ensure that netlink messages originate from the kernel… CVSS 2.0HIGH 7.8
  • TI-2012-02060 Integer overflow in the dhcpv6_get_option function in gdhcp/client.c in ConnMan before… CVSS 2.0MEDIUM 5.0
  • TI-2025-23446 In ConnMan through 1.44, parse_rr in dnsproxy.c has a memcpy length that depends on an RR… CVSS 3.1MEDIUM 4.8

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences