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CVE-2026-15816

—
CVSS 3.1
7.5 high
EPSS
<1%p23
Published
()
Modified
Description

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.

Weakness
CWE-78
Vector
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD CVE.org GitHub PoCs EPSS (0.3%)

In the news

USN-8758-1: dracut vulnerability

Ubuntu patches dracut CVE-2026-15816, where a rogue adjacent-network DHCP server can inject root-executed commands during boot-failure handling.

Ubuntu security notice USN-8758-1 fixes CVE-2026-15816 in dracut, where messages written by the die() function to the emergency hook directory are not properly shell-quoted. An attacker on an adjacent network controlling a rogue DHCP server could exploit this to inject commands executing as root during boot-failure handling. Users should apply the patched dracut package.

Ubuntu Security Notices · 1d agoAdvisoryCVE-2026-15816