CVE-2026-71401 wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read
An integer underflow in wicked's DHCPv4 client allows remote attackers to cause a denial of service via out-of-bounds read.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-71401?
CVE-2026-71401 is a medium-severity vulnerability in SUSE wicked, published on 27 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.
Weakness: CWE-191
Which versions are affected by CVE-2026-71401?
How do I fix CVE-2026-71401?
Apply the vendor's patch.
Is CVE-2026-71401 being exploited?
There is no known exploitation of CVE-2026-71401 in the wild and no public exploit code.
Sources
Also known as GHSA-p653-f3q8-xm5f.