Vulnerability-Lookup

USN-8826-1 (UBUNTU-CVE-2022-47952)

Vulnerability from osv_ubuntu – Published: 2026-09-28 05:47 – Updated: 2026-09-28 05:47 – Source website

Summary

lxc vulnerabilities

Details

Maher Azzouzi discovered that LXC did not correctly handle logging certain failure messages. An attacker could possibly use this issue to leak sensitive information. This issue only affected Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2022-47952)

Sam Sanoop discovered that LXC did not correctly handle certain forms of user authorization. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-39402)

References

URL

Type

	https://ubuntu.com/security/notices/USN-8826-1	ADVISORY
	https://ubuntu.com/security/CVE-2022-47952	REPORT
	https://ubuntu.com/security/CVE-2026-39402	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2022-47952",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc1",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lua-lxc",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lxc-common",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lxc-templates",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          },
          {
            "binary_name": "python3-lxc",
            "binary_version": "2.0.11-0ubuntu1~16.04.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@2.0.11-0ubuntu1~16.04.3+esm1?arch=source\u0026distro=esm-infra-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.0.11-0ubuntu1~16.04.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.1.4-0ubuntu1",
        "1.1.4-0ubuntu1.1",
        "1.1.4-0ubuntu3",
        "1.1.5-0ubuntu1",
        "1.1.5-0ubuntu2",
        "1.1.5-0ubuntu3",
        "1.1.5-0ubuntu4",
        "1.1.5-0ubuntu5",
        "1.1.5-0ubuntu6",
        "2.0.0~beta2-0ubuntu2",
        "2.0.0~rc1-0ubuntu1",
        "2.0.0~rc2-0ubuntu2",
        "2.0.0~rc3-0ubuntu1",
        "2.0.0~rc3-0ubuntu2",
        "2.0.0~rc3-0ubuntu3",
        "2.0.0~rc4-0ubuntu1",
        "2.0.0~rc5-0ubuntu1",
        "2.0.0~rc9-0ubuntu1",
        "2.0.0~rc10-0ubuntu1",
        "2.0.0~rc10-0ubuntu2",
        "2.0.0~rc11-0ubuntu1",
        "2.0.0~rc12-0ubuntu1",
        "2.0.0~rc13-0ubuntu2",
        "2.0.0~rc14-0ubuntu2",
        "2.0.0~rc15-0ubuntu1",
        "2.0.0-0ubuntu1",
        "2.0.0-0ubuntu2",
        "2.0.1-0ubuntu1~16.04.1",
        "2.0.3-0ubuntu1~ubuntu16.04.1",
        "2.0.4-0ubuntu1~ubuntu16.04.2",
        "2.0.5-0ubuntu1~ubuntu16.04.1",
        "2.0.5-0ubuntu1~ubuntu16.04.2",
        "2.0.5-0ubuntu1~ubuntu16.04.3",
        "2.0.6-0ubuntu1~ubuntu16.04.1",
        "2.0.6-0ubuntu1~ubuntu16.04.2",
        "2.0.7-0ubuntu1~16.04.1",
        "2.0.7-0ubuntu1~16.04.2",
        "2.0.8-0ubuntu1~16.04.2",
        "2.0.11-0ubuntu1~16.04.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2022-47952",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:18.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@3.0.3-0ubuntu1~18.04.3+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.3-0ubuntu1~18.04.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-0ubuntu1",
        "2.1.1-0ubuntu1",
        "3.0.0~beta1-0ubuntu3",
        "3.0.0~beta2-0ubuntu2",
        "3.0.0~beta3-0ubuntu1",
        "3.0.0~beta4-0ubuntu1",
        "3.0.0-0ubuntu1",
        "3.0.0-0ubuntu2",
        "3.0.1-0ubuntu1~18.04.1",
        "3.0.1-0ubuntu1~18.04.2",
        "3.0.2-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2022-47952",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:20.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:4.0.12-0ubuntu1~20.04.1+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.0.12-0ubuntu1~20.04.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-0ubuntu1",
        "3.0.4-0ubuntu2",
        "1:4.0.0-0ubuntu2",
        "1:4.0.1-0ubuntu1",
        "1:4.0.1-0ubuntu2",
        "1:4.0.2-0ubuntu1",
        "1:4.0.6-0ubuntu1~20.04.1",
        "1:4.0.12-0ubuntu1~20.04.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2022-47952",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.0.10-0ubuntu5",
        "1:4.0.12-0ubuntu1",
        "1:4.0.12-0ubuntu2",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2022-47952",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.3-2ubuntu7.3+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.3-2ubuntu7.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:5.0.1-0ubuntu7",
        "1:5.0.1-0ubuntu8",
        "1:5.0.3-2ubuntu5",
        "1:5.0.3-2ubuntu7",
        "1:5.0.3-2ubuntu7.1",
        "1:5.0.3-2ubuntu7.2",
        "1:5.0.3-2ubuntu7.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-39402",
              "severity": [
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
                  "type": "CVSS_V4"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:6.0.6-1ubuntu1+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:6.0.6-1ubuntu1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0.4-4ubuntu1",
        "1:6.0.6-1",
        "1:6.0.6-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "Maher Azzouzi discovered that LXC did not correctly handle logging\ncertain failure messages. An attacker could possibly use this issue\nto leak sensitive information. This issue only affected\nUbuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,\nUbuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2022-47952)\n\nSam Sanoop discovered that LXC did not correctly handle certain forms\nof user authorization. An attacker could possibly use this issue to\ncause a denial of service. (CVE-2026-39402)",
  "id": "USN-8826-1",
  "modified": "2026-09-28T05:47:13Z",
  "published": "2026-09-28T05:47:13Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8826-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2022-47952"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39402"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "lxc vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2022-47952",
    "UBUNTU-CVE-2026-39402"
  ]
}

UBUNTU-CVE-2022-47952 (CVE-2022-47952)

Vulnerability from osv_ubuntu – Published: 2023-01-01 06:15 – Updated: 2026-09-28 08:32 – Source website

Details

lxc-user-nic in lxc through 5.0.1 is installed setuid root, and may allow local users to infer whether any file exists, even within a protected directory tree, because "Failed to open" often indicates that a file does not exist, whereas "does not refer to a network namespace path" often indicates that a file exists. NOTE: this is different from CVE-2018-6556 because the CVE-2018-6556 fix design was based on the premise that "we will report back to the user that the open() failed but the user has no way of knowing why it failed"; however, in many realistic cases, there are no plausible reasons for failing except that the file does not exist.

Severity

3.3 (Low)


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

3.3 (Low)


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

N/A (UNKNOWN)

low

References

URL

Type

	https://ubuntu.com/security/CVE-2022-47952	REPORT
	https://github.com/MaherAzzouzi/CVE-2022-47952	REPORT
	https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9…	REPORT
	https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9…	REPORT
	https://www.cve.org/CVERecord?id=CVE-2022-47952	REPORT
	https://ubuntu.com/security/notices/USN-8826-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@3.0.3-0ubuntu1~18.04.3+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.3-0ubuntu1~18.04.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-0ubuntu1",
        "2.1.1-0ubuntu1",
        "3.0.0~beta1-0ubuntu3",
        "3.0.0~beta2-0ubuntu2",
        "3.0.0~beta3-0ubuntu1",
        "3.0.0~beta4-0ubuntu1",
        "3.0.0-0ubuntu1",
        "3.0.0-0ubuntu2",
        "3.0.1-0ubuntu1~18.04.1",
        "3.0.1-0ubuntu1~18.04.2",
        "3.0.2-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:4.0.12-0ubuntu1~20.04.1+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.0.12-0ubuntu1~20.04.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-0ubuntu1",
        "3.0.4-0ubuntu2",
        "1:4.0.0-0ubuntu2",
        "1:4.0.1-0ubuntu1",
        "1:4.0.1-0ubuntu2",
        "1:4.0.2-0ubuntu1",
        "1:4.0.6-0ubuntu1~20.04.1",
        "1:4.0.12-0ubuntu1~20.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.0.10-0ubuntu5",
        "1:4.0.12-0ubuntu1",
        "1:4.0.12-0ubuntu2",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.3-2ubuntu7.3+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.3-2ubuntu7.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:5.0.1-0ubuntu7",
        "1:5.0.1-0ubuntu8",
        "1:5.0.3-2ubuntu5",
        "1:5.0.3-2ubuntu7",
        "1:5.0.3-2ubuntu7.1",
        "1:5.0.3-2ubuntu7.2",
        "1:5.0.3-2ubuntu7.3"
      ]
    }
  ],
  "aliases": [],
  "details": "lxc-user-nic in lxc through 5.0.1 is installed setuid root, and may allow local users to infer whether any file exists, even within a protected directory tree, because \"Failed to open\" often indicates that a file does not exist, whereas \"does not refer to a network namespace path\" often indicates that a file exists. NOTE: this is different from CVE-2018-6556 because the CVE-2018-6556 fix design was based on the premise that \"we will report back to the user that the open() failed but the user has no way of knowing why it failed\"; however, in many realistic cases, there are no plausible reasons for failing except that the file does not exist.",
  "id": "UBUNTU-CVE-2022-47952",
  "modified": "2026-09-28T08:32:43Z",
  "published": "2023-01-01T06:15:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2022-47952"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/MaherAzzouzi/CVE-2022-47952"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/lxc.spec.in#L274"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc/blob/0b83d71c2c8f3bac9503f894cd84584f79258bb3/src/lxc/cmd/lxc_user_nic.c#L1085-L1104"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2022-47952"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8826-1"
    }
  ],
  "related": [
    "USN-8826-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "low",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2022-47952"
  ]
}

UBUNTU-CVE-2026-39402 (CVE-2026-39402)

Vulnerability from osv_ubuntu – Published: 2026-05-05 21:16 – Updated: 2026-09-28 08:55 – Source website

Details

lxc is a Linux container runtime. In the setuid helper lxc-user-nic, the delete path contains a logic flaw in the find_line() function that allows an unprivileged user to delete OVS-attached network interfaces belonging to other users. When lxc-user-nic delete scans its NIC database to authorize a deletion request, the interface name comparison can set the authorization flag based on a name match alone, even when the ownership, type, and link fields in that database entry belong to a different user. The vulnerable check sits after the goto next label handling, meaning it is reachable on lines where earlier ownership checks failed or were skipped. Because nothing downstream of this authorization signal re-verifies that the matched database line actually belongs to the caller, an unprivileged attacker with a valid lxc-usernet policy entry can trigger deletion of another user's OVS port on the same bridge. This is limited to multi-tenant environments using lxc-user-nic with OpenVSwitch bridges. The impact is denial of service - one tenant can repeatedly disconnect networking from containers run by another tenant on shared infrastructure. This is patched in version 7.0.0.

Severity

4.3 (Medium)


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

6.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-39402	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-39402	REPORT
	https://github.com/lxc/lxc/security/advisories/GH…	REPORT
	https://github.com/lxc/lxc/pull/4678	REPORT
	https://ubuntu.com/security/notices/USN-8826-1	ADVISORY

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblxc1",
            "binary_version": "1.0.10-0ubuntu1.1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1.0.10-0ubuntu1.1"
          },
          {
            "binary_name": "lxc-templates",
            "binary_version": "1.0.10-0ubuntu1.1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1.0.10-0ubuntu1.1"
          },
          {
            "binary_name": "python3-lxc",
            "binary_version": "1.0.10-0ubuntu1.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1.0.10-0ubuntu1.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.0.0~alpha1-0ubuntu11",
        "1.0.0~alpha2-0ubuntu1",
        "1.0.0~alpha2-0ubuntu3",
        "1.0.0~alpha2-0ubuntu4",
        "1.0.0~alpha2-0ubuntu5",
        "1.0.0~alpha2-0ubuntu6",
        "1.0.0~alpha3-0ubuntu1",
        "1.0.0~alpha3-0ubuntu2",
        "1.0.0~alpha3-0ubuntu3",
        "1.0.0~alpha3-0ubuntu4",
        "1.0.0~alpha3-0ubuntu5",
        "1.0.0~alpha3-0ubuntu6",
        "1.0.0~alpha3-0ubuntu7",
        "1.0.0~alpha3-0ubuntu8",
        "1.0.0~beta1-0ubuntu1",
        "1.0.0~beta1-0ubuntu2",
        "1.0.0~beta1-0ubuntu3",
        "1.0.0~beta2-0ubuntu1",
        "1.0.0~beta2-0ubuntu2",
        "1.0.0~beta3-0ubuntu1",
        "1.0.0~beta4-0ubuntu1",
        "1.0.0~beta4-0ubuntu2",
        "1.0.0~rc1-0ubuntu2",
        "1.0.0~rc3-0ubuntu1",
        "1.0.0~rc4-0ubuntu1",
        "1.0.0-0ubuntu1",
        "1.0.0-0ubuntu2",
        "1.0.0-0ubuntu3",
        "1.0.0-0ubuntu4",
        "1.0.1-0ubuntu1",
        "1.0.2-0ubuntu1",
        "1.0.2-0ubuntu2",
        "1.0.3-0ubuntu1",
        "1.0.3-0ubuntu2",
        "1.0.3-0ubuntu3",
        "1.0.4-0ubuntu0.1",
        "1.0.5-0ubuntu0.1",
        "1.0.6-0ubuntu0.1",
        "1.0.7-0ubuntu0.1",
        "1.0.7-0ubuntu0.2",
        "1.0.7-0ubuntu0.5",
        "1.0.7-0ubuntu0.6",
        "1.0.7-0ubuntu0.7",
        "1.0.7-0ubuntu0.9",
        "1.0.7-0ubuntu0.10",
        "1.0.8-0ubuntu0.3",
        "1.0.8-0ubuntu0.4",
        "1.0.9-0ubuntu2",
        "1.0.9-0ubuntu3",
        "1.0.10-0ubuntu1",
        "1.0.10-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "3.0.3-0ubuntu1~18.04.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@3.0.3-0ubuntu1~18.04.3+esm1?arch=source\u0026distro=esm-infra/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.0.3-0ubuntu1~18.04.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.1.0-0ubuntu1",
        "2.1.1-0ubuntu1",
        "3.0.0~beta1-0ubuntu3",
        "3.0.0~beta2-0ubuntu2",
        "3.0.0~beta3-0ubuntu1",
        "3.0.0~beta4-0ubuntu1",
        "3.0.0-0ubuntu1",
        "3.0.0-0ubuntu2",
        "3.0.1-0ubuntu1~18.04.1",
        "3.0.1-0ubuntu1~18.04.2",
        "3.0.2-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.1",
        "3.0.3-0ubuntu1~18.04.3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:4.0.12-0ubuntu1~20.04.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:4.0.12-0ubuntu1~20.04.1+esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:4.0.12-0ubuntu1~20.04.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.0.4-0ubuntu1",
        "3.0.4-0ubuntu2",
        "1:4.0.0-0ubuntu2",
        "1:4.0.1-0ubuntu1",
        "1:4.0.1-0ubuntu2",
        "1:4.0.2-0ubuntu1",
        "1:4.0.6-0ubuntu1~20.04.1",
        "1:4.0.12-0ubuntu1~20.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "liblxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:4.0.10-0ubuntu5",
        "1:4.0.12-0ubuntu1",
        "1:4.0.12-0ubuntu2",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1",
        "1:5.0.0~git2209-g5a7b9ce67-0ubuntu1.1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc-utils",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          },
          {
            "binary_name": "lxc1",
            "binary_version": "1:5.0.3-2ubuntu7.3+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:5.0.3-2ubuntu7.3+esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:5.0.3-2ubuntu7.3+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:5.0.1-0ubuntu7",
        "1:5.0.1-0ubuntu8",
        "1:5.0.3-2ubuntu5",
        "1:5.0.3-2ubuntu7",
        "1:5.0.3-2ubuntu7.1",
        "1:5.0.3-2ubuntu7.2",
        "1:5.0.3-2ubuntu7.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:6.0.4-4ubuntu1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:6.0.4-4ubuntu1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:6.0.4-4ubuntu1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:6.0.4-4ubuntu1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:6.0.4-4ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:6.0.4-4ubuntu1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0.3-1",
        "1:6.0.4-2",
        "1:6.0.4-3",
        "1:6.0.4-4",
        "1:6.0.4-4ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "liblxc-common",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "liblxc1t64",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "libpam-cgfs",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "lxc",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          },
          {
            "binary_name": "lxc-tests",
            "binary_version": "1:6.0.6-1ubuntu1+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:26.04:LTS",
        "name": "lxc",
        "purl": "pkg:deb/ubuntu/lxc@1:6.0.6-1ubuntu1+esm1?arch=source\u0026distro=esm-apps/resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1:6.0.6-1ubuntu1+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1:6.0.4-4ubuntu1",
        "1:6.0.6-1",
        "1:6.0.6-1ubuntu1"
      ]
    }
  ],
  "aliases": [],
  "details": "lxc is a Linux container runtime. In the setuid helper lxc-user-nic, the delete path contains a logic flaw in the find_line() function that allows an unprivileged user to delete OVS-attached network interfaces belonging to other users. When lxc-user-nic delete scans its NIC database to authorize a deletion request, the interface name comparison can set the authorization flag based on a name match alone, even when the ownership, type, and link fields in that database entry belong to a different user. The vulnerable check sits after the goto next label handling, meaning it is reachable on lines where earlier ownership checks failed or were skipped. Because nothing downstream of this authorization signal re-verifies that the matched database line actually belongs to the caller, an unprivileged attacker with a valid lxc-usernet policy entry can trigger deletion of another user\u0027s OVS port on the same bridge. This is limited to multi-tenant environments using lxc-user-nic with OpenVSwitch bridges. The impact is denial of service - one tenant can repeatedly disconnect networking from containers run by another tenant on shared infrastructure. This is patched in version 7.0.0.",
  "id": "UBUNTU-CVE-2026-39402",
  "modified": "2026-09-28T08:55:12Z",
  "published": "2026-05-05T21:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-39402"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-39402"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc/security/advisories/GHSA-3m9j-g9gc-vcvq"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/lxc/lxc/pull/4678"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8826-1"
    }
  ],
  "related": [
    "USN-8826-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:H",
      "type": "CVSS_V4"
    },
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-39402"
  ]
}

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.

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

USN-8826-1 (UBUNTU-CVE-2022-47952)

UBUNTU-CVE-2022-47952 (CVE-2022-47952)

UBUNTU-CVE-2026-39402 (CVE-2026-39402)

Tags

Sightings

Nomenclature

Related by attack behaviour