UBUNTU-CVE-2026-6893 (CVE-2026-6893)

Vulnerability from osv_ubuntu – Published: 2026-06-10 20:17 – Updated: 2026-09-28 20:25 – Source website
VLAI
Details

A flaw was found in dracut. A remote attacker on the adjacent network can exploit this vulnerability by providing specially crafted DHCP (Dynamic Host Configuration Protocol) options, such as a malicious hostname, to a system using dracut's legacy DHCP path. These options are improperly handled and written into temporary shell scripts without proper escaping, leading to command injection. This allows the attacker to achieve root code execution within the initramfs, potentially compromising the system's boot and network behavior.

Severity
7.5 (High)
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "044+3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-generic",
            "binary_version": "044+3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-rescue",
            "binary_version": "044+3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "044+3-3ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "044+3-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@044+3-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps-legacy/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "044+3-3ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "043-2",
        "043-4",
        "044+3-1",
        "044+3-2",
        "044+3-3"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "047-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-generic",
            "binary_version": "047-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-rescue",
            "binary_version": "047-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "047-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "047-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@047-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "047-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "045+132-1",
        "047-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "048+80-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-generic",
            "binary_version": "048+80-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-rescue",
            "binary_version": "048+80-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "048+80-2ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "048+80-2ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:20.04:LTS",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@048+80-2ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "048+80-2ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "048+80-2"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-generic",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-config-rescue",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-live",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "051-1ubuntu0.1~esm1"
          },
          {
            "binary_name": "dracut-squash",
            "binary_version": "051-1ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@051-1ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "051-1ubuntu0.1~esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "051-1"
      ]
    },
    {
      "ecosystem_specific": {
        "availability": "No subscription required",
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-config-generic",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-config-rescue",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-install",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-live",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "060+5-1ubuntu3.4"
          },
          {
            "binary_name": "dracut-squash",
            "binary_version": "060+5-1ubuntu3.4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@060+5-1ubuntu3.4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "060+5-1ubuntu3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "059-4ubuntu2",
        "060+5-1ubuntu1",
        "060+5-1ubuntu2",
        "060+5-1ubuntu3",
        "060+5-1ubuntu3.1",
        "060+5-1ubuntu3.2",
        "060+5-1ubuntu3.3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dracut",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-core",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-install",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-live",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-network",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-squash",
            "binary_version": "108-3ubuntu3"
          },
          {
            "binary_name": "dracut-test",
            "binary_version": "108-3ubuntu3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "dracut",
        "purl": "pkg:deb/ubuntu/dracut@108-3ubuntu3?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "106-2ubuntu5",
        "107-1ubuntu1",
        "107-1ubuntu3",
        "107-1ubuntu5",
        "108-1ubuntu1",
        "108-2ubuntu1",
        "108-3ubuntu2",
        "108-3ubuntu3"
      ]
    }
  ],
  "aliases": [],
  "details": "A flaw was found in dracut. A remote attacker on the adjacent network can exploit this vulnerability by providing specially crafted DHCP (Dynamic Host Configuration Protocol) options, such as a malicious hostname, to a system using dracut\u0027s legacy DHCP path. These options are improperly handled and written into temporary shell scripts without proper escaping, leading to command injection. This allows the attacker to achieve root code execution within the initramfs, potentially compromising the system\u0027s boot and network behavior.",
  "id": "UBUNTU-CVE-2026-6893",
  "modified": "2026-09-28T20:25:58Z",
  "published": "2026-06-10T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-6893"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-6893"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2459963"
    },
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-8828-1"
    }
  ],
  "related": [
    "USN-8828-1"
  ],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-6893"
  ]
}



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