usn-7978-1
Vulnerability from osv_ubuntu
Published
2026-01-26 18:47
Modified
2026-04-27 14:11
Summary
screen vulnerabilities
Details

It was discovered that GNU Screen incorrectly handled signals when setuid or setgid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to send privileged signals, possibly leading to a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2023-24626)

It was discovered that GNU Screen incorrectly handled PTY permissions. A local attacker could possibly use this issue to connect to an unauthorized screen session. (CVE-2025-46802)

It was discovered that GNU Screen incorrectly handled file access when setuid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to deduce information about certain file paths. (CVE-2025-46804)

It was discovered that GNU Screen incorrectly handled signals when setuid privileges were being used, which is not the default in Ubuntu. A local attacker could use this issue to send privileged signals, possibly leading to a denial of service. (CVE-2025-46805)

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2023-24626",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-46802",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-46804",
              "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:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-46805",
              "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": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "screen",
            "binary_version": "4.9.0-1ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "screen",
        "purl": "pkg:deb/ubuntu/screen@4.9.0-1ubuntu0.1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.0-1ubuntu0.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.8.0-6",
        "4.8.0-6build1",
        "4.8.0-7",
        "4.9.0-1"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2025-46802",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:N",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-46804",
              "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:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            },
            {
              "id": "CVE-2025-46805",
              "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": "CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
                  "type": "CVSS_V4"
                },
                {
                  "score": "low",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "screen",
            "binary_version": "4.9.1-1ubuntu1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "screen",
        "purl": "pkg:deb/ubuntu/screen@4.9.1-1ubuntu1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.9.1-1ubuntu1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.9.0-4",
        "4.9.1-1",
        "4.9.1-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that GNU Screen incorrectly handled signals when setuid\nor setgid privileges were being used, which is not the default in Ubuntu.\nA local attacker could use this issue to send privileged signals, possibly\nleading to a denial of service. This issue only affected Ubuntu 22.04 LTS.\n(CVE-2023-24626)\n\nIt was discovered that GNU Screen incorrectly handled PTY permissions. A\nlocal attacker could possibly use this issue to connect to an unauthorized\nscreen session. (CVE-2025-46802)\n\nIt was discovered that GNU Screen incorrectly handled file access when\nsetuid privileges were being used, which is not the default in Ubuntu. A\nlocal attacker could use this issue to deduce information about certain\nfile paths. (CVE-2025-46804)\n\nIt was discovered that GNU Screen incorrectly handled signals when setuid\nprivileges were being used, which is not the default in Ubuntu. A local\nattacker could use this issue to send privileged signals, possibly leading\nto a denial of service. (CVE-2025-46805)",
  "id": "USN-7978-1",
  "modified": "2026-04-27T14:11:47Z",
  "published": "2026-01-26T18:47:16Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-7978-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2023-24626"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-46802"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-46804"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2025-46805"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "screen vulnerabilities",
  "upstream": [
    "UBUNTU-CVE-2023-24626",
    "UBUNTU-CVE-2025-46802",
    "UBUNTU-CVE-2025-46804",
    "UBUNTU-CVE-2025-46805"
  ]
}



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