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Systemd EUVDEUVD-2026-21399

| CVE-2026-40225 MEDIUM
Incorrect Resource Transfer Between Spheres (CWE-669)
2026-04-10 mitre GHSA-396h-m3pm-fpm5
Information Disclosure Systemd
6.4
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.4 MEDIUM
AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE
MEDIUM
qualitative
Red Hat
6.4 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Physical
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
260
EUVD ID Assigned
Apr 10, 2026 - 16:00 euvd
EUVD-2026-21399
Analysis Generated
Apr 10, 2026 - 16:00 vuln.today
CVE Published
Apr 10, 2026 - 15:16 nvd
MEDIUM 6.4

DescriptionCVE.org

In udev in systemd before 260, local root execution can occur via malicious hardware devices and unsanitized kernel output.

AnalysisAI

Local root code execution in systemd's udev subsystem before version 260 allows attackers with physical access to craft malicious hardware devices that exploit unsanitized kernel output, achieving privilege escalation from local user context to root. The attack requires physical device insertion but no user interaction; CVSS 6.4 reflects the physical attack vector constraint, though successful exploitation grants complete system compromise. No public exploit code or active exploitation has been confirmed at time of analysis.

Technical ContextAI

The vulnerability resides in systemd's udev (userspace device manager), which handles device hotplug events and executes rules-based actions in response to kernel device notifications. The flaw stems from inadequate sanitization of kernel-supplied device attributes (CWE-669: Inadequate Control Flow Management), allowing malicious hardware or firmware to inject crafted data that udev processes without proper validation. When udev processes these unsanitized kernel outputs during device enumeration or rule evaluation, the attacker-controlled data can trigger unintended code paths. The affected product is systemd versions 0 through 259; systemd 260 and later patch this vulnerability. The physical attack vector (AV:P) indicates the attacker must have local hardware access, distinguishing this from network-exploitable flaws, though once triggered, the execution context runs with root privileges via the udevd daemon.

RemediationAI

Upgrade systemd to version 260 or later, which contains the patch to sanitize kernel device output in udev. Most distributions provide updated systemd packages through their standard repositories; administrators should apply the update via their distribution's package manager (e.g., apt update && apt upgrade systemd on Debian-based systems, or yum update systemd on RHEL-based systems). For systems unable to upgrade immediately, physical access controls and device whitelist policies (via udev rules) can reduce risk by restricting which hardware devices trigger rule execution. Refer to the official systemd security advisory at https://github.com/systemd/systemd/security/advisories/GHSA-vpfq-8p5f-jcqx for distribution-specific patch availability and timelines. No workaround fully mitigates the vulnerability without patching, as the flaw is in the kernel interface parsing layer itself.

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Same weakness CWE-669 – Incorrect Resource Transfer Between Spheres

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Same technique Information Disclosure

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SLES15-SP5-CHOST-BYOS-SAP-CCloud Fixed
SLES15-SP6-CHOST-BYOS Fixed
SLES15-SP6-CHOST-BYOS-Aliyun Fixed
SLES15-SP6-CHOST-BYOS-Azure Fixed
SLES15-SP6-CHOST-BYOS-EC2 Fixed

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EUVD-2026-21399 vulnerability details – vuln.today
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