Vulnerability-Lookup

ubuntu-cve-2026-31912

Vulnerability from osv_ubuntu

Published

2026-09-07 00:00

Modified

2026-09-07 11:38

Summary

Details

(libpcap BPF interpreter detects neither reaching the end of the filter ...)

Severity

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-31912	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-31912	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8",
            "binary_version": "1.5.3-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.5.3-2ubuntu0.1?arch=source\u0026distro=esm-infra-legacy/trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.4.0-2",
        "1.5.1-1",
        "1.5.2-1",
        "1.5.3-1",
        "1.5.3-2",
        "1.5.3-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8",
            "binary_version": "1.7.4-2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.7.4-2ubuntu0.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.4-1",
        "1.7.4-2",
        "1.7.4-2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8",
            "binary_version": "1.8.1-6ubuntu1.18.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.8.1-6ubuntu1.18.04.2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.8.1-5ubuntu1",
        "1.8.1-6ubuntu1",
        "1.8.1-6ubuntu1.18.04.1",
        "1.8.1-6ubuntu1.18.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8",
            "binary_version": "1.9.1-3ubuntu1.20.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.9.1-3ubuntu1.20.04.1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.1-2",
        "1.9.1-3",
        "1.9.1-3ubuntu1.20.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8",
            "binary_version": "1.10.1-4ubuntu1.22.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.10.1-4ubuntu1.22.04.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.0-2build1",
        "1.10.1-4",
        "1.10.1-4build1",
        "1.10.1-4ubuntu1.22.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8t64",
            "binary_version": "1.10.4-4.1ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.10.4-4.1ubuntu3?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.4-4",
        "1.10.4-4ubuntu3",
        "1.10.4-4.1ubuntu2",
        "1.10.4-4.1ubuntu3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libpcap0.8t64",
            "binary_version": "1.10.6-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libpcap",
        "purl": "pkg:deb/ubuntu/libpcap@1.10.6-1ubuntu1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.10.5-2ubuntu2",
        "1.10.5-2ubuntu3",
        "1.10.6-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "(libpcap BPF interpreter detects neither reaching the end of the filter ...)",
  "id": "UBUNTU-CVE-2026-31912",
  "modified": "2026-09-07T11:38:58Z",
  "published": "2026-09-07T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-31912"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31912"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-31912"
  ]
}

CVE-2026-31912 (GCVE-0-2026-31912)

Vulnerability from cvelistv5 – Published: 2026-09-05 18:49 – Updated: 2026-09-05 18:49

Title

OOBR in libpcap before 1.10.7

Summary

libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures.

Severity

5.5 (Medium)


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

CWE

CWE-1285 - Improper Validation of Specified Index, Position, or Offset in Input
CWE-823 - Use of Out-of-range Pointer Offset
CWE-125 - Out-of-bounds Read

Assigner

Tcpdump mitre root

References

1 reference

URL	Tags
https://github.com/the-tcpdump-group/libpcap/comm…	patch

Impacted products

1 product

Vendor	Product	Version
The Tcpdump Group	libpcap	Affected: 0 , < 1.10.7 (semver)

Credits

Denis Ovsienko

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "modules": [
            "BPF interpreter"
          ],
          "product": "libpcap",
          "programFiles": [
            "bpf_filter.c"
          ],
          "programRoutines": [
            {
              "name": "pcapint_filter_with_aux_data()"
            }
          ],
          "repo": "https://github.com/the-tcpdump-group/libpcap/",
          "vendor": "The Tcpdump Group",
          "versions": [
            {
              "lessThan": "1.10.7",
              "status": "affected",
              "version": "0",
              "versionType": "semver"
            }
          ]
        }
      ],
      "configurations": [
        {
          "lang": "en",
          "value": "The problem is specific to applications that use pcap_offline_filter() or bpf_filter() with an externally-supplied compiled filter program without validating the program first."
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Denis Ovsienko"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "libpcap BPF interpreter detects neither reaching the end of the filter program buffer due to lack of a return instruction nor executing a jump instruction with an offset that translates to a pointer outside of the buffer.  In particular uncommon use cases a crafted filter program can cause the interpreter to try reading the OS process memory in the 32GiB around the buffer on 64-bit architectures and in the entire address space on 32-bit architectures."
        }
      ],
      "exploits": [
        {
          "lang": "en",
          "value": "A functional exploit exists."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-1285",
              "description": "CWE-1285 Improper Validation of Specified Index, Position, or Offset in Input",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-823",
              "description": "CWE-823 Use of Out-of-range Pointer Offset",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-125",
              "description": "CWE-125 Out-of-bounds Read",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-05T18:49:41.619Z",
        "orgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896",
        "shortName": "Tcpdump"
      },
      "references": [
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/the-tcpdump-group/libpcap/commit/d3f358d3cffbe1ecb94d5284b3e81f052a0adcb9"
        }
      ],
      "solutions": [
        {
          "lang": "en",
          "value": "Upgrade to libpcap 1.10.7 and migrate from bpf_filter() to pcap_offline_filter()."
        }
      ],
      "source": {
        "discovery": "INTERNAL"
      },
      "title": "OOBR in libpcap before 1.10.7",
      "x_generator": {
        "engine": "cvelib 1.8.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "cfdbb673-b408-4d03-89c1-c3d73ed80896",
    "assignerShortName": "Tcpdump",
    "cveId": "CVE-2026-31912",
    "datePublished": "2026-09-05T18:49:41.619Z",
    "dateReserved": "2026-03-10T09:30:50.972Z",
    "dateUpdated": "2026-09-05T18:49:41.619Z",
    "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.