UBUNTU-CVE-2026-15816

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Source
https://ubuntu.com/security/CVE-2026-15816
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-15816
Upstream
  • CVE-2026-15816
Downstream
USN (2)
Related
USN (2)
Published
2026-08-07T11:17:00Z
Modified
2026-09-28T22:56:46Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:24.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
060+5-1ubuntu3.4

Affected versions

Other
059-4ubuntu2
060+5-1ubuntu1
060+5-1ubuntu2
060+5-1ubuntu3
060+5-1ubuntu3.*
060+5-1ubuntu3.1
060+5-1ubuntu3.2
060+5-1ubuntu3.3

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
Ubuntu:26.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
110-11ubuntu0.1

Affected versions

Other
108-3ubuntu3
108-8ubuntu1
109-5ubuntu1
109-7ubuntu1
109-9ubuntu1
109-11ubuntu1
110-1ubuntu2
110-3ubuntu1
110-5
110-7
110-10
110-11

Ecosystem specific 

{
    "availability":  "No subscription required",
    "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
Ubuntu:Pro:16.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps-legacy%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
044+3-3ubuntu0.1~esm1

Affected versions

Other
043-2
043-4
044+3-1
044+3-2
044+3-3

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
Ubuntu:Pro:18.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
047-2ubuntu0.1~esm1

Affected versions

Other
045+132-1
047-2

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
Ubuntu:Pro:20.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
048+80-2ubuntu0.1~esm1

Affected versions

Other
048+80-2

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"
Ubuntu:Pro:22.04:LTS
dracut

Package

Name
dracut
Purl
pkg:deb/ubuntu/dracut?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
051-1ubuntu0.1~esm1

Affected versions

Other
051-1

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"