CVE-2026-14258
Dhcpcd: dhcpcd infinite loop and out-of-bounds read via zero-length ipv6 nd option in router advertisement handling
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.
Fixes and workarounds
Workaround
Until an updated package is available, administrators should disable IPv6 Router Advertisement processing on interfaces where it is not required or restrict acceptance of untrusted ICMPv6 Router Advertisements using appropriate network filtering. Systems that rely on IPv6 Stateless Address Autoconfiguration (SLAAC) or Router Advertisement-based network configuration should carefully evaluate the operational impact before applying these mitigations.
Source: CNA: redhatAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| Red Hat Enterprise Linux 10 Red Hat dhcpcd
https://access.redhat.com/downloads/content/package-browser/ |
≥ 0:10.0.6-11.el10_2; < * (unaffected, rpm)
Other versions: affected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA: redhat |
Exploit evidence
- https://github.com/NetworkConfiguration/dhcpcd/issues/415
exploit · ADP: CISA-ADP
References
- https://access.redhat.com/errata/RHSA-2026:54210CNA: redhat · vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-14258CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2462305CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://github.com/NetworkConfiguration/dhcpcd/commit/75289caCNA: redhat
- https://github.com/NetworkConfiguration/dhcpcd/issues/415CNA: redhat
- https://github.com/NetworkConfiguration/dhcpcd/issues/415ADP: CISA-ADP · exploit
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