UnratedFix available

UBUNTU-CVE-2026-0799

Type: advisorySource: OSV1 source record

In BPF instructions that load/store a value from/to a scratch memory register the register index is an unsigned 32-bit integer and must not exceed 15, but libpcap BPF interpreter does not validate the value. In particular uncommon use cases a crafted filter program can cause the interpreter to try reading and writing the OS process memory in the 16GiB starting at the current stack frame on 64-bit architectures and in the entire address space on 32-bit architectures.

Announced 5 Sept 2026Source revision 1

Original source ↗

UBUNTU-CVE-2026-0799

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-0799

libpcap

Source reference: /affected/0/package/name

Affected versions: 1.4.0-2
Source reference: /affected/0/versions
1.5.1-1
Source reference: /affected/0/versions
1.5.2-1
Source reference: /affected/0/versions
1.5.3-1
Source reference: /affected/0/versions
1.5.3-2
Source reference: /affected/0/versions
1.5.3-2ubuntu0.1
Source reference: /affected/0/versions
Fixed versions: 1.5.3-2ubuntu0.1+esm1
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/1/package/name

Affected versions: 1.7.4-1
Source reference: /affected/1/versions
1.7.4-2
Source reference: /affected/1/versions
1.7.4-2ubuntu0.1
Source reference: /affected/1/versions
Fixed versions: 1.7.4-2ubuntu0.1+esm1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/2/package/name

Affected versions: 1.8.1-5ubuntu1
Source reference: /affected/2/versions
1.8.1-6ubuntu1
Source reference: /affected/2/versions
1.8.1-6ubuntu1.18.04.1
Source reference: /affected/2/versions
1.8.1-6ubuntu1.18.04.2
Source reference: /affected/2/versions
Fixed versions: 1.8.1-6ubuntu1.18.04.2+esm1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/3/package/name

Affected versions: 1.9.1-2
Source reference: /affected/3/versions
1.9.1-3
Source reference: /affected/3/versions
1.9.1-3ubuntu1.20.04.1
Source reference: /affected/3/versions
Fixed versions: 1.9.1-3ubuntu1.20.04.1+esm1
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/4/package/name

Affected versions: 1.10.0-2build1
Source reference: /affected/4/versions
1.10.1-4
Source reference: /affected/4/versions
1.10.1-4build1
Source reference: /affected/4/versions
1.10.1-4ubuntu1.22.04.1
Source reference: /affected/4/versions
Fixed versions: 1.10.1-4ubuntu1.22.04.2
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/5/package/name

Affected versions: 1.10.4-4
Source reference: /affected/5/versions
1.10.4-4ubuntu3
Source reference: /affected/5/versions
1.10.4-4.1ubuntu2
Source reference: /affected/5/versions
1.10.4-4.1ubuntu3
Source reference: /affected/5/versions
Fixed versions: 1.10.4-4.1ubuntu3.1
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

libpcap

Source reference: /affected/6/package/name

Affected versions: 1.10.5-2ubuntu2
Source reference: /affected/6/versions
1.10.5-2ubuntu3
Source reference: /affected/6/versions
1.10.6-1ubuntu1
Source reference: /affected/6/versions
Fixed versions: 1.10.6-1ubuntu1.1
Source reference: /affected/6/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.5.3-2ubuntu0.1+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra-legacy%2Ftrusty",
      "ecosystem": "Ubuntu:Pro:14.04:LTS"
    },
    "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"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8",
          "binary_version": "1.5.3-2ubuntu0.1+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.7.4-2ubuntu0.1+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra-legacy%2Fxenial",
      "ecosystem": "Ubuntu:Pro:16.04:LTS"
    },
    "versions": [
      "1.7.4-1",
      "1.7.4-2",
      "1.7.4-2ubuntu0.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8",
          "binary_version": "1.7.4-2ubuntu0.1+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.8.1-6ubuntu1.18.04.2+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra%2Fbionic",
      "ecosystem": "Ubuntu:Pro:18.04:LTS"
    },
    "versions": [
      "1.8.1-5ubuntu1",
      "1.8.1-6ubuntu1",
      "1.8.1-6ubuntu1.18.04.1",
      "1.8.1-6ubuntu1.18.04.2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8",
          "binary_version": "1.8.1-6ubuntu1.18.04.2+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.9.1-3ubuntu1.20.04.1+esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=esm-infra%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "1.9.1-2",
      "1.9.1-3",
      "1.9.1-3ubuntu1.20.04.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8",
          "binary_version": "1.9.1-3ubuntu1.20.04.1+esm1"
        }
      ],
      "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.10.1-4ubuntu1.22.04.2"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=jammy",
      "ecosystem": "Ubuntu:22.04:LTS"
    },
    "versions": [
      "1.10.0-2build1",
      "1.10.1-4",
      "1.10.1-4build1",
      "1.10.1-4ubuntu1.22.04.1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8",
          "binary_version": "1.10.1-4ubuntu1.22.04.2"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.10.4-4.1ubuntu3.1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "1.10.4-4",
      "1.10.4-4ubuntu3",
      "1.10.4-4.1ubuntu2",
      "1.10.4-4.1ubuntu3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8t64",
          "binary_version": "1.10.4-4.1ubuntu3.1"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "1.10.6-1ubuntu1.1"
          }
        ]
      }
    ],
    "package": {
      "name": "libpcap",
      "purl": "pkg:deb/ubuntu/libpcap?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "1.10.5-2ubuntu2",
      "1.10.5-2ubuntu3",
      "1.10.6-1ubuntu1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0799.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "libpcap0.8t64",
          "binary_version": "1.10.6-1ubuntu1.1"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #17546 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 01:35:08 GMT
Publisher date: Sat, 05 Sep 2026 19:16:00 GMT

Read the original announcement