Denial of Service Vulnerability in DHCPCD's IPv6 Router Advertisement Processing by NetworkConfiguration
CVE-2026-14258

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Vendor
CVE Published:
1 July 2026

What is CVE-2026-14258?

A vulnerability has been identified in DHCPCD related to the processing of IPv6 Neighbor Discovery Router Advertisements. The flaw arises when a specially crafted IPv6 Router Advertisement includes a zero-length Neighbor Discovery option, which bypasses necessary validation checks during packet storage. This leads to a situation where the packet is reparsed without adequate validation, potentially causing the parser to enter a non-advancing loop. If exploited, this can result in excessive consumption of CPU resources, ultimately impacting system performance and availability.

References

https://access.redhat.com/security/cve/CVE-2026-14258
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2462305
issue-trackingx_refsource_REDHAT
https://github.com/NetworkConfiguration/dhcpcd/commit/752...

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Adjacent Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank AISLE Research for reporting this issue.
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