{
  "document": {
    "aggregate_severity": {
      "text": "Important"
    },
    "category": "csaf_vex",
    "csaf_version": "2.0",
    "distribution": {
      "text": "TuxCare License Agreement",
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "https://tuxcare.com/contact/",
      "name": "TuxCare",
      "namespace": "https://tuxcare.com/"
    },
    "references": [
      {
        "category": "self",
        "summary": "Canonical URL",
        "url": "https://security.tuxcare.com/csaf/v2/els_os/debian11els/vex/2026/cve-2026-72693-els_os-debian11els.json"
      }
    ],
    "tracking": {
      "current_release_date": "2026-09-18T16:15:46Z",
      "generator": {
        "date": "2026-09-18T16:15:46Z",
        "engine": {
          "name": "pyCSAF"
        }
      },
      "id": "CVE-2026-72693-ELS_OS-DEBIAN11ELS",
      "initial_release_date": "2026-08-11T09:17:00Z",
      "revision_history": [
        {
          "date": "2026-08-11T09:17:00Z",
          "number": "1",
          "summary": "Initial version"
        },
        {
          "date": "2026-09-18T16:15:46Z",
          "number": "2",
          "summary": "Official Publication"
        }
      ],
      "status": "final",
      "version": "2"
    },
    "title": "Security update on CVE-2026-72693"
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_name",
                "name": "Debian 11",
                "product": {
                  "name": "Debian 11",
                  "product_id": "Debian-11",
                  "product_identification_helper": {
                    "cpe": "cpe:2.3:o:debian:debian_linux:11:*:*:*:*:*:*:*"
                  }
                }
              }
            ],
            "category": "product_family",
            "name": "Debian"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3.armel",
                "product": {
                  "name": "kbd-0:2.3.0-3.armel",
                  "product_id": "kbd-0:2.3.0-3.armel",
                  "product_identification_helper": {
                    "purl": "pkg:deb/debian/kbd@2.3.0-3?arch=armel"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "armel"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3.arm64",
                "product": {
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                  "product_id": "kbd-0:2.3.0-3.arm64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/debian/kbd@2.3.0-3?arch=arm64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "arm64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3.amd64",
                "product": {
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                  "product_id": "kbd-0:2.3.0-3.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/debian/kbd@2.3.0-3?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "Software in the Public Interest, Inc."
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3+tuxcare.els2.armel",
                "product": {
                  "name": "kbd-0:2.3.0-3+tuxcare.els2.armel",
                  "product_id": "kbd-0:2.3.0-3+tuxcare.els2.armel",
                  "product_identification_helper": {
                    "purl": "pkg:deb/tuxcare/kbd@2.3.0-3%2Btuxcare.els2?arch=armel"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "armel"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3+tuxcare.els2.arm64",
                "product": {
                  "name": "kbd-0:2.3.0-3+tuxcare.els2.arm64",
                  "product_id": "kbd-0:2.3.0-3+tuxcare.els2.arm64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/tuxcare/kbd@2.3.0-3%2Btuxcare.els2?arch=arm64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "arm64"
          },
          {
            "branches": [
              {
                "category": "product_version",
                "name": "kbd-0:2.3.0-3+tuxcare.els2.amd64",
                "product": {
                  "name": "kbd-0:2.3.0-3+tuxcare.els2.amd64",
                  "product_id": "kbd-0:2.3.0-3+tuxcare.els2.amd64",
                  "product_identification_helper": {
                    "purl": "pkg:deb/tuxcare/kbd@2.3.0-3%2Btuxcare.els2?arch=amd64"
                  }
                }
              }
            ],
            "category": "architecture",
            "name": "amd64"
          }
        ],
        "category": "vendor",
        "name": "TuxCare"
      }
    ],
    "relationships": [
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3+tuxcare.els2.armel as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.armel"
        },
        "product_reference": "kbd-0:2.3.0-3+tuxcare.els2.armel",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3+tuxcare.els2.arm64 as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.arm64"
        },
        "product_reference": "kbd-0:2.3.0-3+tuxcare.els2.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3+tuxcare.els2.amd64 as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.amd64"
        },
        "product_reference": "kbd-0:2.3.0-3+tuxcare.els2.amd64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3.armel as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3.armel"
        },
        "product_reference": "kbd-0:2.3.0-3.armel",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3.arm64 as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3.arm64"
        },
        "product_reference": "kbd-0:2.3.0-3.arm64",
        "relates_to_product_reference": "Debian-11"
      },
      {
        "category": "default_component_of",
        "full_product_name": {
          "name": "kbd-0:2.3.0-3.amd64 as a component of Debian 11",
          "product_id": "Debian-11:kbd-0:2.3.0-3.amd64"
        },
        "product_reference": "kbd-0:2.3.0-3.amd64",
        "relates_to_product_reference": "Debian-11"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-72693",
      "cwe": {
        "id": "CWE-284",
        "name": "Improper Access Control"
      },
      "notes": [
        {
          "category": "description",
          "text": "`openvt -u` is intended to identify the owner of the current VT and then execute `login` as that user from a privileged context. In the documented `kbrequest`/init usage, the ownership test in `authenticate_user()` relies on `stat(\"/proc/<pid>/fd/0\")`. `stat()` on `/proc/<pid>/fd/0` follows the symlink to the underlying TTY device node. As a result, `buf.st_uid` reflects the owner of the TTY node rather than the owner of the process holding the file descriptor. If the TTY owner returns to `root` or the getty owner after logout while an unprivileged process still has `fd 0` attached to that TTY, the check can incorrectly treat that process as belonging to the privileged console owner. Once that check succeeds, the `-u` path executes a passwordless login as the selected user. In the documented `kbrequest`/init deployment using `openvt -us`, this can result in passwordless `login -f root` on the spawned VT. This report establishes that privilege escalation path for that documented deployment; it does not claim equivalent reachability for deployments that do not use `openvt -u` from a privileged `kbrequest`/init path.",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "fixed": [
          "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.amd64",
          "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.arm64",
          "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.armel"
        ],
        "known_affected": [
          "Debian-11:kbd-0:2.3.0-3.amd64",
          "Debian-11:kbd-0:2.3.0-3.arm64",
          "Debian-11:kbd-0:2.3.0-3.armel"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-72693"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:41136",
          "url": "https://access.redhat.com/errata/RHSA-2026:41136"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:57597",
          "url": "https://access.redhat.com/errata/RHSA-2026:57597"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:57610",
          "url": "https://access.redhat.com/errata/RHSA-2026:57610"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:60440",
          "url": "https://access.redhat.com/errata/RHSA-2026:60440"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/errata/RHSA-2026:66357",
          "url": "https://access.redhat.com/errata/RHSA-2026:66357"
        },
        {
          "category": "external",
          "summary": "https://access.redhat.com/security/cve/CVE-2026-72693",
          "url": "https://access.redhat.com/security/cve/CVE-2026-72693"
        },
        {
          "category": "external",
          "summary": "https://bugzilla.redhat.com/show_bug.cgi?id=2462115",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2462115"
        }
      ],
      "release_date": "2026-08-11T09:17:00Z",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-09-18T16:15:09.911802Z",
          "details": "Details on how to apply the fix are available at: https://cve.tuxcare.com/els/releases/CLSA-2026:1789748107",
          "product_ids": [
            "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.amd64",
            "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.arm64",
            "Debian-11:kbd-0:2.3.0-3+tuxcare.els2.armel"
          ],
          "url": "https://cve.tuxcare.com/els/releases/CLSA-2026:1789748107"
        },
        {
          "category": "none_available",
          "date": "2026-08-11T09:17:00Z",
          "details": "Affected",
          "product_ids": [
            "Debian-11:kbd-0:2.3.0-3.amd64",
            "Debian-11:kbd-0:2.3.0-3.arm64",
            "Debian-11:kbd-0:2.3.0-3.armel"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ]
    }
  ]
}