Vulnerability-Lookup

OPENSUSE-SU-2026:21669-1

Vulnerability from csaf_opensuse - Published: 2026-08-27 16:26 - Updated: 2026-09-17 17:42

Summary

Security update for wicked

Severity

Important

Notes

Title of the patch: Security update for wicked

Description of the patch: This update for wicked fixes the following issues: Changes in wicked: - Fix two OOB reads in ni_capture_inspect_udp_header and improve: - Reject packets with ip_len < ihl to avoid a size_t underflow of the UDP length, which the checksum truncates to uint16_t (bsc#1274627, CVE-2026-71401). - Set payload_len to the remaining payload, not ip_len, which over-read the DHCP option walker by ihl + 8 bytes past the buffer (bsc#1274627, CVE-2026-71402). - Avoid checksumming packets that fail the length/protocol checks and tidy up the debug messages (bsc#1274627). - Fix underflow check in ni_dhcp4_option_next to handle option code and length separately as the END and PAD options don't have length (bsc#1274627). Thanks to Daniel Birtwhistle for discovering and reporting the issues.

Patchnames: openSUSE-Leap-16.0-packagehub-540

CVE-2026-71401

7.5 (High)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Recommended 12 products

Product	Version	Remediation
Unresolved product id: openSUSE Leap 16.0:wicked-0:0.6.80-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-0:0.6.80-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-0:0.6.80-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-0:0.6.80-bp160.2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-nbft-0:0.6.80-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-nbft-0:0.6.80-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-nbft-0:0.6.80-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-nbft-0:0.6.80-bp160.2.1.x86_64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-service-0:0.6.80-bp160.2.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-service-0:0.6.80-bp160.2.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-service-0:0.6.80-bp160.2.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Leap 16.0:wicked-service-0:0.6.80-bp160.2.1.x86_64	—	Vendor Fix

Threats

Impact important

CVE-2026-71402

5.3 (Medium)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected products

Recommended 12 products, the same list as for CVE-2026-71401

Threats

Impact important

References

9 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://bugzilla.suse.com/1274627	self
https://www.suse.com/security/cve/CVE-2026-71401/	self
https://www.suse.com/security/cve/CVE-2026-71402/	self
https://www.suse.com/security/cve/CVE-2026-71401	external
https://bugzilla.suse.com/1274627	external
https://www.suse.com/security/cve/CVE-2026-71402	external
https://bugzilla.suse.com/1274627	external

JSON

To clipboard

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CVE-2026-71401 (GCVE-0-2026-71401)

Vulnerability from cvelistv5 – Published: 2026-08-27 15:01 – Updated: 2026-08-27 19:31

Title

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

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.

Severity

5.3 (Medium)


                        
                          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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 19:30 UTC

CWE

CWE-191 - Integer underflow (wrap or wraparound)

Assigner

suse mitre root

References

2 references

URL	Tags
https://bugzilla.suse.com/show_bug.cgi?id=1274627	issue-tracking
https://github.com/openSUSE/wicked/pull/1079	patch

Impacted products

1 product

Vendor	Product	Version
SUSE	wicked	Affected: 0 , ≤ 0.6.80 (semver)

Date Public

2026-08-27 14:56

Credits

Daniel Birtwhistle

Show details on NVD website

JSON

To clipboard

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CVE-2026-71402 (GCVE-0-2026-71402)

Vulnerability from cvelistv5 – Published: 2026-08-27 15:09 – Updated: 2026-08-27 19:30

Title

wicked: out-of-bounds read in the DHCPv4 option parser due to payload length taken from the IP total length

Summary

An out-of-bounds read was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c reports the IP total length as the payload length instead of the length of the remaining UDP payload. Consequently, the DHCP option walker in the DHCPv4 client (wickedd-dhcp4) reads up to ihl + 8 bytes — at most 68 bytes — past the end of the 1500-byte packet receive buffer. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can make the client parse adjacent heap memory as DHCP options, so that heap contents such as allocator metadata or pointer values can be interpreted into lease fields. The over-read is bounded to 68 bytes; no memory write, no attacker control over the adjacent bytes and no remote exfiltration primitive has been demonstrated. This issue affects wicked up to and including version 0.6.80.

Severity

5.3 (Medium)


                        
                          CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

5.4 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 19:30 UTC

CWE

CWE-125 - Out-of-bounds read
CWE-130 - Improper handling of length parameter inconsistency

Assigner

suse mitre root

References

2 references

URL	Tags
https://bugzilla.suse.com/show_bug.cgi?id=1274627	issue-tracking
https://github.com/openSUSE/wicked/pull/1079	patch

Impacted products

1 product

Vendor	Product	Version
SUSE	wicked	Affected: 0 , ≤ 0.6.80 (semver)

Date Public

2026-08-27 15:02

Credits

Daniel Birtwhistle

Show details on NVD website

JSON

To clipboard

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              "value": "An out-of-bounds read was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c reports the IP total length as the payload length instead of the length of the remaining UDP payload. Consequently, the DHCP option walker in the DHCPv4 client (wickedd-dhcp4) reads up to ihl + 8 bytes \u2014 at most 68 bytes \u2014 past the end of the 1500-byte packet receive buffer. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can make the client parse adjacent heap memory as DHCP options, so that heap contents such as allocator metadata or pointer values can be interpreted into lease fields. The over-read is bounded to 68 bytes; no memory write, no attacker control over the adjacent bytes and no remote exfiltration primitive has been demonstrated. This issue affects wicked up to and including version 0.6.80.\u003cbr\u003e"
            }
          ],
          "value": "An out-of-bounds read was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c reports the IP total length as the payload length instead of the length of the remaining UDP payload. Consequently, the DHCP option walker in the DHCPv4 client (wickedd-dhcp4) reads up to ihl + 8 bytes \u2014 at most 68 bytes \u2014 past the end of the 1500-byte packet receive buffer. An unauthenticated attacker on the same network who sends a crafted DHCP/UDP packet can make the client parse adjacent heap memory as DHCP options, so that heap contents such as allocator metadata or pointer values can be interpreted into lease fields. The over-read is bounded to 68 bytes; no memory write, no attacker control over the adjacent bytes and no remote exfiltration primitive has been demonstrated. This issue affects wicked up to and including version 0.6.80."
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-540",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-540 Overread Buffers"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
            "Safety": "NOT_DEFINED",
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "ADJACENT",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "exploitMaturity": "NOT_DEFINED",
            "privilegesRequired": "NONE",
            "providerUrgency": "NOT_DEFINED",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "NONE",
            "valueDensity": "NOT_DEFINED",
            "vectorString": "CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "NONE",
            "vulnConfidentialityImpact": "LOW",
            "vulnIntegrityImpact": "LOW",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "ADJACENT_NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "LOW",
            "integrityImpact": "LOW",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-130",
              "description": "CWE-130 Improper handling of length parameter inconsistency",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-27T15:09:41.984Z",
        "orgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
        "shortName": "suse"
      },
      "references": [
        {
          "tags": [
            "issue-tracking"
          ],
          "url": "https://bugzilla.suse.com/show_bug.cgi?id=1274627"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/openSUSE/wicked/pull/1079"
        }
      ],
      "source": {
        "discovery": "UNKNOWN"
      },
      "title": "wicked: out-of-bounds read in the DHCPv4 option parser due to payload length taken from the IP total length",
      "x_generator": {
        "engine": "Vulnogram 1.0.5"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "404e59f5-483d-4b8a-8e7a-e67604dd8afb",
    "assignerShortName": "suse",
    "cveId": "CVE-2026-71402",
    "datePublished": "2026-08-27T15:09:41.984Z",
    "dateReserved": "2026-08-06T11:38:54.896Z",
    "dateUpdated": "2026-08-27T19:30:42.063Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

OPENSUSE-SU-2026:21669-1

CVE-2026-71401 (GCVE-0-2026-71401)

CVE-2026-71402 (GCVE-0-2026-71402)

Tags

Sightings

Nomenclature

Related by attack behaviour