CVE-2025-6019
Published: April 11, 2026
Official Description
A Local Privilege Escalation (LPE) vulnerability was found in libblockdev. Generally, the "allow_active" 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 "allow_active" 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.
Risk Analysis
A local privilege escalation vulnerability exists in libblockdev, allowing a physically present user to gain root privileges. By manipulating XFS images and the udisks daemon, an attacker can execute arbitrary code with elevated permissions. The confirmed exploitation in the wild and inclusion in CISA's KEV catalog indicate a severe and actively exploited local threat.
This vulnerability is actively being exploited in the wild and is listed in CISA's Known Exploited Vulnerabilities catalog. Exploitation requires local access to the system.
Apply available patches for libblockdev to mitigate this vulnerability. Restrict physical access to systems and ensure that only trusted users have interactive access.
Technical Analysis
CVE-2025-6019 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation requires some privileges, which limits the exposure to scenarios where an attacker has already gained initial access.
CISA has added CVE-2025-6019 to the Known Exploited Vulnerabilities (KEV) catalog, confirming active exploitation in the wild. U.S. federal agencies are required to patch this within the mandated timeframe, and all organizations should treat remediation as urgent.
Exploit & PoC Resources
Quick Facts
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2025-6019 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
- !CISA KEV: Federal agencies must patch per BOD 22-01 timeline
- !Active exploitation confirmed — treat as P1