UnratedFix available

UBUNTU-CVE-2026-15816

Type: advisorySource: OSV1 source record

A flaw was found in dracut. The die() error-handling function writes its message into a shell script under the initramfs emergency-hook directory without properly shell-quoting it. When the message contains data derived from the DHCP ROOT_PATH option, an attacker on the adjacent network who controls a rogue DHCP server can inject a command-substitution sequence that executes as root the next time dracut sources its emergency hook scripts during standard boot-failure handling.

Announced 7 Aug 2026Group revision 1

Original source ↗

UBUNTU-CVE-2026-15816

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:UBUNTU-CVE-2026-15816

dracut

Source reference: /affected/0/package/name

Affected versions: 043-2
Source reference: /affected/0/versions
043-4
Source reference: /affected/0/versions
044+3-1
Source reference: /affected/0/versions
044+3-2
Source reference: /affected/0/versions
044+3-3
Source reference: /affected/0/versions
Fixed versions: 044+3-3ubuntu0.1~esm1
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

dracut

Source reference: /affected/1/package/name

Affected versions: 045+132-1
Source reference: /affected/1/versions
047-2
Source reference: /affected/1/versions
Fixed versions: 047-2ubuntu0.1~esm1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

dracut

Source reference: /affected/2/package/name

Affected versions: 048+80-2
Source reference: /affected/2/versions
Fixed versions: 048+80-2ubuntu0.1~esm1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

dracut

Source reference: /affected/3/package/name

Affected versions: 051-1
Source reference: /affected/3/versions
Fixed versions: 051-1ubuntu0.1~esm1
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

dracut

Source reference: /affected/4/package/name

Affected versions: 059-4ubuntu2
Source reference: /affected/4/versions
060+5-1ubuntu1
Source reference: /affected/4/versions
060+5-1ubuntu2
Source reference: /affected/4/versions
060+5-1ubuntu3
Source reference: /affected/4/versions
060+5-1ubuntu3.1
Source reference: /affected/4/versions
060+5-1ubuntu3.2
Source reference: /affected/4/versions
060+5-1ubuntu3.3
Source reference: /affected/4/versions
Fixed versions: 060+5-1ubuntu3.4
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

dracut

Source reference: /affected/5/package/name

Affected versions: 108-3ubuntu3
Source reference: /affected/5/versions
108-8ubuntu1
Source reference: /affected/5/versions
109-5ubuntu1
Source reference: /affected/5/versions
109-7ubuntu1
Source reference: /affected/5/versions
109-9ubuntu1
Source reference: /affected/5/versions
109-11ubuntu1
Source reference: /affected/5/versions
110-1ubuntu2
Source reference: /affected/5/versions
110-3ubuntu1
Source reference: /affected/5/versions
110-5
Source reference: /affected/5/versions
110-7
Source reference: /affected/5/versions
110-10
Source reference: /affected/5/versions
110-11
Source reference: /affected/5/versions
Fixed versions: 110-11ubuntu0.1
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "044+3-3ubuntu0.1~esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps-legacy%2Fxenial",
      "ecosystem": "Ubuntu:Pro:16.04:LTS"
    },
    "versions": [
      "043-2",
      "043-4",
      "044+3-1",
      "044+3-2",
      "044+3-3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "047-2ubuntu0.1~esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Fbionic",
      "ecosystem": "Ubuntu:Pro:18.04:LTS"
    },
    "versions": [
      "045+132-1",
      "047-2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "048+80-2ubuntu0.1~esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Ffocal",
      "ecosystem": "Ubuntu:Pro:20.04:LTS"
    },
    "versions": [
      "048+80-2"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "051-1ubuntu0.1~esm1"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Fjammy",
      "ecosystem": "Ubuntu:Pro:22.04:LTS"
    },
    "versions": [
      "051-1"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "Available with Ubuntu Pro: https://ubuntu.com/pro"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "060+5-1ubuntu3.4"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=noble",
      "ecosystem": "Ubuntu:24.04:LTS"
    },
    "versions": [
      "059-4ubuntu2",
      "060+5-1ubuntu1",
      "060+5-1ubuntu2",
      "060+5-1ubuntu3",
      "060+5-1ubuntu3.1",
      "060+5-1ubuntu3.2",
      "060+5-1ubuntu3.3"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "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"
        }
      ],
      "availability": "No subscription required"
    }
  },
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          },
          {
            "fixed": "110-11ubuntu0.1"
          }
        ]
      }
    ],
    "package": {
      "name": "dracut",
      "purl": "pkg:deb/ubuntu/dracut?arch=source&distro=resolute",
      "ecosystem": "Ubuntu:26.04:LTS"
    },
    "versions": [
      "108-3ubuntu3",
      "108-8ubuntu1",
      "109-5ubuntu1",
      "109-7ubuntu1",
      "109-9ubuntu1",
      "109-11ubuntu1",
      "110-1ubuntu2",
      "110-3ubuntu1",
      "110-5",
      "110-7",
      "110-10",
      "110-11"
    ],
    "database_specific": {
      "source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
    },
    "ecosystem_specific": {
      "binaries": [
        {
          "binary_name": "dracut",
          "binary_version": "110-11ubuntu0.1"
        },
        {
          "binary_name": "dracut-core",
          "binary_version": "110-11ubuntu0.1"
        },
        {
          "binary_name": "dracut-install",
          "binary_version": "110-11ubuntu0.1"
        },
        {
          "binary_name": "dracut-network",
          "binary_version": "110-11ubuntu0.1"
        },
        {
          "binary_name": "dracut-test",
          "binary_version": "110-11ubuntu0.1"
        }
      ],
      "availability": "No subscription required"
    }
  }
]

Publisher severity

No explicit severity was provided.

Event: #23738 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 06:24:01 GMT
Publisher date: Fri, 07 Aug 2026 11:17:00 GMT

Read the original announcement

Revision history

25 Oct 2026UBUNTU-CVE-2026-15816 · Revision 1Source updated