Bug#1139725: dracut: CVE-2026-6893: Root code execution via DHCP options command injection

From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1139725: dracut: CVE-2026-6893: Root code execution via DHCP options command injection
Date	2026-06-12 06:10 +0200
Message-ID	<N51nr-cbr3-3@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

Cross-posted to 2 groups.

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Source: dracut
Version: 111-2
Severity: important
Tags: security upstream
Forwarded: https://github.com/dracut-ng/dracut/pull/2469
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for dracut.

CVE-2026-6893[0]:
| 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.

Only main reference is the bugzilla entry from Red Hat[1] but there is
a draft merge request upsream now at time of writing[2].

If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-6893
    https://www.cve.org/CVERecord?id=CVE-2026-6893
[1] https://bugzilla.redhat.com/show_bug.cgi?id=2459963
[2] https://github.com/dracut-ng/dracut/pull/2469

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore

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Bug#1139725: dracut: CVE-2026-6893: Root code execution via DHCP options command injection Salvatore Bonaccorso <carnil@debian.org> - 2026-06-12 06:10 +0200
  Bug#1139725: marked as done (dracut: CVE-2026-6893: Root code  execution via DHCP options command injection) "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-08-03 02:40 +0200

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