ubuntu-cve-2021-4009
Vulnerability from osv_ubuntu
Published
2021-12-14 12:00
Modified
2026-04-22 07:39
Summary
Details

A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.


{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "xdmx",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xdmx-tools",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xnest",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xserver-xorg-xmir",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:1.15.1-0ubuntu2.11+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:1.15.1-0ubuntu2.11+esm5?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.15.1-0ubuntu2.11+esm5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.14.3-3ubuntu2",
        "2:1.14.3-3ubuntu3",
        "2:1.14.3-3ubuntu4",
        "2:1.14.3-5ubuntu1",
        "2:1.14.4-1ubuntu1",
        "2:1.14.4-1ubuntu2",
        "2:1.14.4.901-0ubuntu2",
        "2:1.14.5-1ubuntu2",
        "2:1.14.5-1ubuntu4",
        "2:1.15.0-1ubuntu1",
        "2:1.15.0-1ubuntu2",
        "2:1.15.0-1ubuntu3",
        "2:1.15.0-1ubuntu4",
        "2:1.15.0-1ubuntu6",
        "2:1.15.0-1ubuntu7",
        "2:1.15.1-0ubuntu1",
        "2:1.15.1-0ubuntu2",
        "2:1.15.1-0ubuntu2.1",
        "2:1.15.1-0ubuntu2.4",
        "2:1.15.1-0ubuntu2.5",
        "2:1.15.1-0ubuntu2.6",
        "2:1.15.1-0ubuntu2.7",
        "2:1.15.1-0ubuntu2.9",
        "2:1.15.1-0ubuntu2.10",
        "2:1.15.1-0ubuntu2.11",
        "2:1.15.1-0ubuntu2.11+esm2",
        "2:1.15.1-0ubuntu2.11+esm3",
        "2:1.15.1-0ubuntu2.11+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "xdmx",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xdmx-tools",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xmir",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xnest",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xserver-xorg-xmir",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          },
          {
            "binary_name": "xwayland",
            "binary_version": "2:1.18.4-0ubuntu0.12+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:1.18.4-0ubuntu0.12+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.18.4-0ubuntu0.12+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.17.2-1ubuntu9",
        "2:1.17.2-1ubuntu10",
        "2:1.17.3-2ubuntu1",
        "2:1.17.3-2ubuntu2",
        "2:1.17.3-2ubuntu3",
        "2:1.17.3-2ubuntu4",
        "2:1.18.1-1ubuntu3",
        "2:1.18.1-1ubuntu4",
        "2:1.18.3-1ubuntu1",
        "2:1.18.3-1ubuntu2",
        "2:1.18.3-1ubuntu2.2",
        "2:1.18.3-1ubuntu2.3",
        "2:1.18.4-0ubuntu0.1",
        "2:1.18.4-0ubuntu0.2",
        "2:1.18.4-0ubuntu0.3",
        "2:1.18.4-0ubuntu0.4",
        "2:1.18.4-0ubuntu0.6",
        "2:1.18.4-0ubuntu0.7",
        "2:1.18.4-0ubuntu0.8",
        "2:1.18.4-0ubuntu0.9",
        "2:1.18.4-0ubuntu0.10",
        "2:1.18.4-0ubuntu0.11",
        "2:1.18.4-0ubuntu0.12"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "xmir-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xorg-server-source-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xserver-xephyr-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xserver-xorg-core-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xserver-xorg-dev-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xserver-xorg-legacy-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          },
          {
            "binary_name": "xwayland-hwe-16.04",
            "binary_version": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "xorg-server-hwe-16.04",
        "purl": "pkg:deb/ubuntu/xorg-server-hwe-16.04@2:1.19.6-1ubuntu4.1~16.04.6+esm5?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.19.6-1ubuntu4.1~16.04.6+esm5"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.18.4-1ubuntu6.1~16.04.1",
        "2:1.18.4-1ubuntu6.1~16.04.2",
        "2:1.19.3-1ubuntu1~16.04.2",
        "2:1.19.3-1ubuntu1~16.04.3",
        "2:1.19.3-1ubuntu1~16.04.4",
        "2:1.19.5-0ubuntu2~16.04.1",
        "2:1.19.6-1ubuntu4~16.04.1",
        "2:1.19.6-1ubuntu4.1~16.04.1",
        "2:1.19.6-1ubuntu4.1~16.04.2",
        "2:1.19.6-1ubuntu4.1~16.04.3",
        "2:1.19.6-1ubuntu4.1~16.04.4",
        "2:1.19.6-1ubuntu4.1~16.04.5",
        "2:1.19.6-1ubuntu4.1~16.04.6",
        "2:1.19.6-1ubuntu4.1~16.04.6+esm1",
        "2:1.19.6-1ubuntu4.1~16.04.6+esm3",
        "2:1.19.6-1ubuntu4.1~16.04.6+esm4"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xdmx",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xdmx-tools",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xmir",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xnest",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xserver-xorg-xmir",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          },
          {
            "binary_name": "xwayland",
            "binary_version": "2:1.19.6-1ubuntu4.10"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:1.19.6-1ubuntu4.10?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.19.6-1ubuntu4.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.19.5-0ubuntu2",
        "2:1.19.6-1ubuntu1",
        "2:1.19.6-1ubuntu2",
        "2:1.19.6-1ubuntu3",
        "2:1.19.6-1ubuntu4",
        "2:1.19.6-1ubuntu4.1",
        "2:1.19.6-1ubuntu4.2",
        "2:1.19.6-1ubuntu4.3",
        "2:1.19.6-1ubuntu4.4",
        "2:1.19.6-1ubuntu4.5",
        "2:1.19.6-1ubuntu4.6",
        "2:1.19.6-1ubuntu4.7",
        "2:1.19.6-1ubuntu4.8",
        "2:1.19.6-1ubuntu4.9"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xorg-server-source-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          },
          {
            "binary_name": "xserver-xephyr-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          },
          {
            "binary_name": "xserver-xorg-core-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          },
          {
            "binary_name": "xserver-xorg-dev-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          },
          {
            "binary_name": "xserver-xorg-legacy-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          },
          {
            "binary_name": "xwayland-hwe-18.04",
            "binary_version": "2:1.20.8-2ubuntu2.2~18.04.6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "xorg-server-hwe-18.04",
        "purl": "pkg:deb/ubuntu/xorg-server-hwe-18.04@2:1.20.8-2ubuntu2.2~18.04.6?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.20.8-2ubuntu2.2~18.04.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.20.1-3ubuntu2.1~18.04.1",
        "2:1.20.4-1ubuntu3~18.04.1",
        "2:1.20.5+git20191008-0ubuntu1~18.04.1",
        "2:1.20.8-2ubuntu2.1~18.04.1",
        "2:1.20.8-2ubuntu2.2~18.04.1",
        "2:1.20.8-2ubuntu2.2~18.04.2",
        "2:1.20.8-2ubuntu2.2~18.04.3",
        "2:1.20.8-2ubuntu2.2~18.04.4",
        "2:1.20.8-2ubuntu2.2~18.04.5"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xdmx",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xdmx-tools",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xnest",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          },
          {
            "binary_name": "xwayland",
            "binary_version": "2:1.20.13-1ubuntu1~20.04.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:1.20.13-1ubuntu1~20.04.2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.20.13-1ubuntu1~20.04.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.20.5+git20191008-0ubuntu1",
        "2:1.20.6-1ubuntu1",
        "2:1.20.7-2ubuntu1",
        "2:1.20.7-2ubuntu2",
        "2:1.20.8-2ubuntu2",
        "2:1.20.8-2ubuntu2.1",
        "2:1.20.8-2ubuntu2.2",
        "2:1.20.8-2ubuntu2.3",
        "2:1.20.8-2ubuntu2.4",
        "2:1.20.8-2ubuntu2.6",
        "2:1.20.9-2ubuntu1.1~20.04.1",
        "2:1.20.9-2ubuntu1.2~20.04.1",
        "2:1.20.9-2ubuntu1.2~20.04.2",
        "2:1.20.11-1ubuntu1~20.04.2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xdmx",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xdmx-tools",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xnest",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xorg-server-source",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xserver-common",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xserver-xephyr",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xserver-xorg-core",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xserver-xorg-legacy",
            "binary_version": "2:1.20.13-1ubuntu2"
          },
          {
            "binary_name": "xvfb",
            "binary_version": "2:1.20.13-1ubuntu2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "xorg-server",
        "purl": "pkg:deb/ubuntu/xorg-server@2:1.20.13-1ubuntu2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:1.20.13-1ubuntu2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:1.20.13-1ubuntu1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "xwayland",
            "binary_version": "2:21.1.3-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "xwayland",
        "purl": "pkg:deb/ubuntu/xwayland@2:21.1.3-1ubuntu1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2:21.1.3-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2:21.1.2-0ubuntu1",
        "2:21.1.3-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in xorg-x11-server in versions before 21.1.2 and before 1.20.14. An out-of-bounds access can occur in the SProcXFixesCreatePointerBarrier function. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.",
  "id": "UBUNTU-CVE-2021-4009",
  "modified": "2026-04-22T07:39:50Z",
  "published": "2021-12-14T12:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-4009"
    },
    {
      "type": "REPORT",
      "url": "https://www.openwall.com/lists/oss-security/2021/12/14/1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5193-1"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5193-2"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-5193-3"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2021-4009"
    }
  ],
  "related": [
    "USN-5193-1",
    "USN-5193-2",
    "USN-5193-3"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2021-4009"
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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