Dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length ipv6 nd option in router advertisement handling
CVE-2026-14258 is fixed in dhcpcd on 1 platform, first by RHSA-2026:54210, released December 1, 2024. It is not reported as exploited. Patch Radar priority: Routine.
A flaw was found in dhcpcd's IPv6 Neighbor Discovery Router Advertisement processing. A specially crafted IPv6 Router Advertisement containing a zero-length Neighbor Discovery option can bypass validation during packet storage and later be reparsed without adequate validation, causing the parser to enter a non-advancing loop. Successful exploitation may result in excessive CPU consumption, leading to a denial of service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| dhcpcd · Debian 13.5 (trixie) | 1:10.1.0-11+deb13u4 | DEBIAN-CVE-2026-14258 | Jul 2, 2026 |
| dhcpcd · Debian 14 | 1:10.2.4-3 | DEBIAN-CVE-2026-14258 | Jul 2, 2026 |
| dhcpcd · RHEL 10 | 10.0.6-11.el10_2 | RHSA-2026:54210 | Dec 1, 2024 |
| dhcpcd · almalinux 10 | 10.0.6-11.el10_2 | ALSA-2026:54210 | Aug 12, 2026 |
| dhcpcd · ol 10 | 0:10.0.6-11.el10_2 | ELSA-2026-54210 | Aug 13, 2026 |
| dhcpcd · rocky 10 | 0:10.0.6-11.el10_2 | RLSA-2026:54210 | Aug 13, 2026 |
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