CVE-2026-111581
Received Received - Intake

Command Injection in libblockdev via udisks2

Publication date: 2026-10-16

Last updated on: 2026-10-16

Assigner: redhat-SADP

Description
A flaw was found in libblockdev. The bd_fs_ntfs_set_label() and bd_fs_vfat_set_label() functions pass caller-supplied label values as bare positional arguments to the ntfslabel and fatlabel utilities without end-of-options separators or input validation for values beginning with a dash. This allows a label starting with '-' to be interpreted as a command-line flag by the spawned tool, potentially bypassing safety checks or causing unintended operations. This is reachable by unprivileged local users through the udisks2 Filesystem.SetLabel() D-Bus method without administrator authentication.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published
2026-10-16
Last Modified
2026-10-16
Generated
2026-10-16
AI Q&A
2026-10-16
EPSS Evaluated
N/A
NVD
CVE-2026-111581
EUVD
EUVD-2026-102935

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
Red Hat Red Hat Enterprise Linux 10 *
Red Hat Red Hat Enterprise Linux 7 *
Red Hat Red Hat Enterprise Linux 8 *
Red Hat Red Hat Enterprise Linux 9 *

Helpful Resources

Exploitability

CWE
CWE Icon
KEV
KEV Icon
CWE ID Description
CWE-88 The product constructs a string for a command to be executed by a separate component in another control sphere, but it does not properly delimit the intended arguments, options, or switches within that command string.

Attack-Flow Graph

AI Quick Actions

Instant insights powered by AI
Executive Summary

This vulnerability is in libblockdev's NTFS and VFAT filesystem plugins. The functions bd_fs_ntfs_set_label() and bd_fs_vfat_set_label() pass user-supplied labels directly to external binaries (ntfslabel and fatlabel) without proper sanitization. Labels starting with a dash ('-') are interpreted as command-line flags by these utilities, allowing argument injection. This flaw is exploitable by unprivileged local users via udisks2's Filesystem.SetLabel() D-Bus method without administrator authentication.

Detection Guidance

Check if libblockdev is installed and inspect filesystem label operations. Look for suspicious ntfslabel or fatlabel command invocations in process logs. Commands like 'ps aux | grep ntfslabel' or 'journalctl -u udisks2' may reveal unusual activity. Also review polkit policies for udisks2 modifications.

Impact Analysis

The impact is limited. Attackers could manipulate filesystem metadata or trigger unintended operations like printing version information, but no privilege escalation, data corruption, or cross-user attacks were demonstrated. The D-Bus API ultimately fails to execute the intended label change, minimizing real-world impact.

Compliance Impact

This vulnerability does not directly impact compliance with GDPR, HIPAA, or similar standards. It is a local privilege escalation risk limited to filesystem label manipulation on user-owned devices without cross-user attack paths or data corruption. No evidence suggests it could lead to unauthorized data access or disclosure required for regulatory violations.

Mitigation Strategies

Update libblockdev to the latest patched version. Restrict polkit policies to limit udisks2 Filesystem.SetLabel() access. Monitor filesystem operations and disable label changes for untrusted users until patched.

Chat Assistant

Ask questions about this CVE
Hi! I’m here to help you understand CVE-2026-111581. Ask me anything about the vulnerability, its impact, or mitigation strategies.
0/70

EPSS Chart