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Fencer Vulns
medium 5.3

CVE-2026-71401 json

wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read

published 2026-08-27 2 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-67079

cvss
5.3
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 18%
public exploits
0
none known

Summary

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.

Patch / fix

  • wicked SLES for SAP 15 SP4, SLES 15 SP4-LTSS, SLE Micro 5.4 +3 more 0.6.79-150400.3.44.1
  • wicked SLE Module for Basesystem 15 SP7 0.6.79-150700.3.8.1
  • wicked SLES for SAP 15 SP5, SLES 15 SP5-LTSS, SLE Micro 5.5 +2 more 0.6.79-150500.3.47.1
  • wicked SLES for SAP 15 SP6, SLES 15 SP6-LTSS 0.6.79-150600.11.20.1
  • wicked SLES LTSS Extended Security 12 SP5, SLES 12 SP5-LTSS 0.6.79-3.61.1

suse advisories SUSE-SU-2026:3842-1SUSE-SU-2026:3841-1SUSE-SU-2026:3840-1SUSE-SU-2026:3839-1SUSE-SU-2026:3837-1

  • wicked openSUSE Tumbleweed 0.6.80-2.1
  • wicked openSUSE Leap 16.0 0.6.80-bp160.2.1

opensuse advisories openSUSE-SU-2026:11636-1openSUSE-SU-2026:21669-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-71401 updated cvss 6.5

wicked: wicked: Denial of Service via integer underflow in DHCPv4 packet capture

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
2 mo ago

Exploit prediction

0.26% chance of exploitation in the next 30 days, higher than 18% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 5.3 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 5.3 CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • SUSE wicked

Classification

Weakness
  • CWE-191 Integer Underflow (Wrap or Wraparound)

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.