{"id":"UBUNTU-CVE-2026-15816","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.","modified":"2026-09-15T03:15:04.207894822Z","published":"2026-08-07T11:17:00Z","related":["USN-8758-1"],"upstream":["CVE-2026-15816"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-15816"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-15816"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-15816"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2459963"},{"type":"REPORT","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2500889"},{"type":"REPORT","url":"https://github.com/dracutdevs/dracut/blob/master/modules.d/40network/netroot.sh"},{"type":"REPORT","url":"https://github.com/dracutdevs/dracut/blob/master/modules.d/99base/dracut-lib.sh"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8758-1"}],"affected":[{"package":{"name":"dracut","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["043-2","043-4","044+3-1","044+3-2","044+3-3"],"ecosystem_specific":{"binaries":[{"binary_name":"dracut","binary_version":"044+3-3"},{"binary_name":"dracut-config-generic","binary_version":"044+3-3"},{"binary_name":"dracut-config-rescue","binary_version":"044+3-3"},{"binary_name":"dracut-core","binary_version":"044+3-3"},{"binary_name":"dracut-network","binary_version":"044+3-3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"}},{"package":{"name":"dracut","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["045+132-1","047-2"],"ecosystem_specific":{"binaries":[{"binary_name":"dracut","binary_version":"047-2"},{"binary_name":"dracut-config-generic","binary_version":"047-2"},{"binary_version":"047-2","binary_name":"dracut-config-rescue"},{"binary_name":"dracut-core","binary_version":"047-2"},{"binary_name":"dracut-network","binary_version":"047-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"}},{"package":{"name":"dracut","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["048+80-2"],"ecosystem_specific":{"binaries":[{"binary_version":"048+80-2","binary_name":"dracut"},{"binary_name":"dracut-config-generic","binary_version":"048+80-2"},{"binary_name":"dracut-config-rescue","binary_version":"048+80-2"},{"binary_version":"048+80-2","binary_name":"dracut-core"},{"binary_name":"dracut-network","binary_version":"048+80-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"}},{"package":{"name":"dracut","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["051-1"],"ecosystem_specific":{"binaries":[{"binary_name":"dracut","binary_version":"051-1"},{"binary_name":"dracut-config-generic","binary_version":"051-1"},{"binary_name":"dracut-config-rescue","binary_version":"051-1"},{"binary_name":"dracut-core","binary_version":"051-1"},{"binary_name":"dracut-live","binary_version":"051-1"},{"binary_version":"051-1","binary_name":"dracut-network"},{"binary_name":"dracut-squash","binary_version":"051-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"}},{"package":{"name":"dracut","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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":"060+5-1ubuntu3.3"},{"binary_name":"dracut-config-generic","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-config-rescue","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-core","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-install","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-live","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-network","binary_version":"060+5-1ubuntu3.3"},{"binary_name":"dracut-squash","binary_version":"060+5-1ubuntu3.3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-15816.json"}},{"package":{"name":"dracut","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/dracut?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"110-11ubuntu0.1"}]}],"versions":["108-3ubuntu3","108-8ubuntu1","109-5ubuntu1","109-7ubunt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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"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}