{"id":"CVE-2026-71401","state":"PUBLISHED","title":"wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read","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.","publishedAt":"2026-08-27T15:01:27.342Z","updatedAt":"2026-08-27T19:31:06.894Z","severity":{"score":5.3,"label":"Medium","version":"4.0","vector":"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","source":"suse"},"assigner":"suse","products":["SUSE wicked"],"affected":[{"vendor":"SUSE","product":"wicked","packageName":"wicked","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.6.80","versionType":"semver"}],"repo":"https://github.com/openSUSE/wicked"}],"references":["https://bugzilla.suse.com/show_bug.cgi?id=1274627","https://github.com/openSUSE/wicked/pull/1079"],"weaknesses":["CWE-191"],"ingestedAt":"2026-10-29T20:12:49.727Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/71xxx/CVE-2026-71401.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-71401","state":"PUBLISHED","datePublished":"2026-08-27T15:01:27.342Z","dateUpdated":"2026-08-27T19:31:06.894Z","assignerShortName":"suse","assignerOrgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateReserved":"2026-08-06T11:38:54.896Z"},"containers":{"cna":{"title":"wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"SUSE","product":"wicked","packageName":"wicked","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.6.80","versionType":"semver"}],"repo":"https://github.com/openSUSE/wicked"}],"references":[{"url":"https://bugzilla.suse.com/show_bug.cgi?id=1274627","tags":["issue-tracking"]},{"url":"https://github.com/openSUSE/wicked/pull/1079","tags":["patch"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"ADJACENT","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"LOW","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"MEDIUM","baseScore":5.3,"vectorString":"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-191","lang":"en","description":"CWE-191 Integer underflow (wrap or wraparound)","type":"CWE"}]}],"providerMetadata":{"shortName":"suse","orgId":"404e59f5-483d-4b8a-8e7a-e67604dd8afb","dateUpdated":"2026-08-27T15:01:27.342Z"},"datePublic":"2026-08-27T14:56:00.000Z","impacts":[{"capecId":"CAPEC-92","descriptions":[{"lang":"en","value":"CAPEC-92 Forced Integer Overflow"}]},{"capecId":"CAPEC-540","descriptions":[{"lang":"en","value":"CAPEC-540 Overread Buffers"}]}],"credits":[{"lang":"en","value":"Daniel Birtwhistle","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"Vulnogram 1.0.5"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-27T19:30:57.920125Z","id":"CVE-2026-71401","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-27T19:31:06.894Z"}}]}}}