Introduction
Privilege escalation and service disruption on Linux systems can have immediate operational consequences for enterprises and end users alike. CVE-2025-8067 exposes a critical flaw in the UDisks daemon, a core component for storage management present on most modern Linux distributions. This vulnerability enables unprivileged users to crash the daemon or potentially escalate privileges by exploiting an out-of-bounds read condition via the D-BUS interface.
UDisks is a widely deployed service that provides storage management facilities through a D-BUS API. It is present by default on many Linux distributions, making vulnerabilities in this service highly impactful across desktop and server environments.
Technical Information
CVE-2025-8067 is an out-of-bounds read vulnerability (CWE-125) in the UDisks daemon's loop device handler. The affected handler processes D-BUS requests to create loop devices, receiving two key parameters: a file descriptor list and an index specifying which file to use as the loop device backing file. The function correctly validates that the index does not exceed a maximum allowed value, but crucially, it does not check if the index is negative.
This incomplete validation allows an attacker with local access to send a crafted D-BUS message with a negative index. When the daemon processes this request, it performs an out-of-bounds read operation, which can result in a crash (denial of service) or, in some cases, local privilege escalation by accessing files owned by privileged users. The vulnerability is triggered entirely via the D-BUS system interface and does not require remote access.
No public code snippets or proof of concept are available for this vulnerability. The root cause is the lack of lower bound validation on the index parameter in the loop device handler's D-BUS interface.
Affected Systems and Versions
- UDisks daemon (exact affected versions are not specified in public sources)
- All Linux distributions shipping vulnerable UDisks versions are potentially affected
- The vulnerability is present when the D-BUS system interface is accessible to unprivileged users
Vendor Security History
Red Hat has a mature vulnerability management process and has previously disclosed and coordinated fixes for similar UDisks vulnerabilities, including CVE-2025-6018 and CVE-2025-6019. Their advisories are detailed and their response time is generally prompt. Red Hat's security team is recognized for its responsible disclosure practices and upstream collaboration.