USN-8895-1 (UBUNTU-CVE-2026-96512)

Vulnerability from osv_ubuntu – Published: 2026-10-07 13:12 – Updated: 2026-10-07 13:12 – Source website
VLAI
Summary
sudo vulnerability
Details

It was discovered that Sudo did not properly handle time-based access restrictions when sudoers rules used NOTBEFORE or NOTAFTER with timestamps omitting the trailing timezone indicator. A local attacker could possibly use this issue to execute commands outside the intended time window by manipulating the TZ environment variable.

References
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{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-96512",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:22.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "sudo",
            "binary_version": "1.9.9-1ubuntu2.7"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.9.9-1ubuntu2.7"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.9-1ubuntu2.7?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.9-1ubuntu2.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.5p2-3ubuntu2",
        "1.9.9-1ubuntu2",
        "1.9.9-1ubuntu2.1",
        "1.9.9-1ubuntu2.2",
        "1.9.9-1ubuntu2.3",
        "1.9.9-1ubuntu2.4",
        "1.9.9-1ubuntu2.5",
        "1.9.9-1ubuntu2.6"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-96512",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:24.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-sudo",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.4"
          },
          {
            "binary_name": "sudo",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.4"
          },
          {
            "binary_name": "sudo-ldap",
            "binary_version": "1.9.15p5-3ubuntu5.24.04.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.15p5-3ubuntu5.24.04.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.15p5-3ubuntu5.24.04.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.14p2-1ubuntu1",
        "1.9.15p5-3ubuntu1",
        "1.9.15p5-3ubuntu3",
        "1.9.15p5-3ubuntu4",
        "1.9.15p5-3ubuntu5",
        "1.9.15p5-3ubuntu5.24.04.1",
        "1.9.15p5-3ubuntu5.24.04.2",
        "1.9.15p5-3ubuntu5.24.04.3"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2026-96512",
              "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"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:26.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "libnss-sudo",
            "binary_version": "1.9.17p2-1ubuntu3.2"
          },
          {
            "binary_name": "sudo",
            "binary_version": "1.9.17p2-1ubuntu3.2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "sudo",
        "purl": "pkg:deb/ubuntu/sudo@1.9.17p2-1ubuntu3.2?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.17p2-1ubuntu3.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.9.17p2-1ubuntu1",
        "1.9.17p2-1ubuntu2",
        "1.9.17p2-1ubuntu3",
        "1.9.17p2-1ubuntu3.1"
      ]
    }
  ],
  "aliases": [],
  "details": "It was discovered that Sudo did not properly handle time-based access\nrestrictions when sudoers rules used NOTBEFORE or NOTAFTER with\ntimestamps omitting the trailing timezone indicator. A local attacker\ncould possibly use this issue to execute commands outside the intended\ntime window by manipulating the TZ environment variable.",
  "id": "USN-8895-1",
  "modified": "2026-10-07T13:12:22Z",
  "published": "2026-10-07T13:12:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8895-1"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-96512"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "sudo vulnerability",
  "upstream": [
    "UBUNTU-CVE-2026-96512"
  ]
}



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