Security Flaw in Linux UDisks Daemon: A Deep Dive into CVE-2025-8067
A newly identified security vulnerability in the Linux UDisks daemon, designated CVE-2025-8067, has raised alarms in the open-source community. This out-of-bounds read flaw exposes local, unprivileged users to the significant risk of accessing files and data owned by privileged accounts. The ramifications of this breach could be extensive and troubling for various Linux distribution users.
Details of CVE-2025-8067
Red Hat officially announced this vulnerability on August 28, 2025, categorizing it as “Important” based on its severity. It has received a preliminary Common Vulnerability Scoring System (CVSS) base score of 8.5 out of 10, indicating a serious threat level.
What is UDisks?
UDisks is a crucial component found in many Linux systems, facilitating the management of storage devices through a D-BUS interface. This utility enables operations such as the creation and removal of loop devices—virtual devices that let users mount files similarly to block devices, which can be pivotal for system operations.
How the Flaw Works
The core issue with UDisks revolves around how it processes file index parameters from clients during the creation of loop devices. Although the daemon correctly checks that the provided index does not exceed the permissible maximum, it neglects to validate whether this index is negative. This oversight is what creates the out-of-bounds read vulnerability.
When an attacker submits a negative index, the UDisks daemon tries to access memory locations that may be outside the designated file descriptor list. This could lead to a denial-of-service condition or, more critically, the exposure of sensitive information stored in memory. Such data could include cryptographic keys, personal identifiable information (PII), or user credentials, significantly raising the risk of local privilege escalation.
Who is Affected by CVE-2025-8067?
The vulnerability impacts several Red Hat Enterprise Linux (RHEL) distributions, specifically:
- Red Hat Enterprise Linux 6 (no longer supported)
- Red Hat Enterprise Linux 7, 8, 9, and 10
The affected packages include:
udisksudisks2libudisks2udisks2-iscsiudisks2-lsmudisks2-lvm2
Unless specified otherwise, all minor versions and update streams of these packages may also be vulnerable.
Reaction from Red Hat
Red Hat’s Product Security Team has highlighted the urgency of addressing this vulnerability, noting in their advisory:
“This vulnerability has been rated with an Important severity due to its low complexity to exploit and the possible local privilege escalation risks associated with successful exploitation.”
Currently, there are no known workarounds or mitigations other than promptly applying updates to the UDisks packages as they become available in Red Hat’s repositories.
Technical Insights and Risk Assessment
The particulars of this vulnerability include:
- CVE Identifier: CVE-2025-8067
- Vulnerability Type: Out-of-bounds read (CWE-125)
- Attack Vector: Local
- Privileges Required: None
- User Interaction Required: None
- Scope: Changed
- Confidentiality Impact: Low to Moderate
- Integrity Impact: Low
- Availability Impact: High
- Exploit Complexity: Low
According to Red Hat’s CVSS assessment, this vulnerability enables the potential reading of memory containing valuable internal data. Attackers might exploit this to bypass security measures like Address Space Layout Randomization (ASLR) or set the stage for further exploit chains.
Overall, the CVE-2025-8067 vulnerability presents a considerable local security risk, making it possible for attackers to gain access to sensitive information or escalate privileges on shared or compromised systems. Given its low complexity and lack of privilege requirements, this threat looms large, especially in enterprise environments. System administrators are strongly urged to apply patches to vulnerable systems immediately, as documented in official CVE databases.
