CVE-2025-6019

A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the "allowactive" setting in Polkit permits a physically present user to take certain actions based on the session type. Due to the way libblockdev interacts with the udisks daemon, an "allowactive" user on a system may be able escalate to full root privileges on the target host. Normally, udisks mounts user-provided filesystem images with security flags like nosuid and nodev to prevent privilege escalation. However, a local attacker can create a specially crafted XFS image containing a SUID-root shell, then trick udisks into resizing it. This mounts their malicious filesystem with root privileges, allowing them to execute their SUID-root shell and gain complete control of the system.

References

Affected packages

Debian:11 / libblockdev

Package

Name: libblockdev
Purl: pkg:deb/debian/libblockdev?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.25-2+deb11u1

Affected versions

2.*

2.25-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / libblockdev

Package

Name: libblockdev
Purl: pkg:deb/debian/libblockdev?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.28-2+deb12u1

Affected versions

2.*

2.28-2

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / libblockdev

Package

Name: libblockdev
Purl: pkg:deb/debian/libblockdev?arch=source

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

3.3.0-2.1

Ecosystem specific

{
    "urgency": "not yet assigned"
}