CVE-2025-12105 is a high-severity use-after-free vulnerability discovered in the libsoup library, which is extensively utilized by GNOME and WebKit-based applications to manage HTTP/2 communications on Red Hat Enterprise Linux 10. The vulnerability stems from a race condition in the asynchronous message queue handling mechanism. Specifically, when network operations are aborted at precise timing intervals, an internal message queue item may be freed twice due to missing state synchronization. This double-free leads to a use-after-free memory access, which can cause the affected application to crash, resulting in a denial-of-service (DoS) condition. The vulnerability can be exploited remotely by an attacker who crafts specific HTTP/2 read and cancel sequences to trigger the flaw without requiring any authentication or user interaction. Although the vulnerability does not compromise confidentiality or integrity, it severely impacts availability by crashing critical applications that rely on libsoup for HTTP/2 communication. The CVSS v3.1 base score is 7.5, reflecting the network attack vector, low attack complexity, no privileges required, and no user interaction needed. Currently, there are no known exploits in the wild, but the widespread use of libsoup in GNOME and WebKit-based applications on Red Hat Enterprise Linux 10 makes this a significant threat. The lack of available patches at the time of disclosure necessitates immediate attention from system administrators to monitor and prepare for updates.

For European organizations, the primary impact of CVE-2025-12105 is the potential for denial-of-service attacks against systems running Red Hat Enterprise Linux 10 with GNOME or WebKit-based applications that utilize the libsoup library for HTTP/2 communications. This can disrupt critical services, especially in environments where these applications handle web communications or internal APIs. The availability impact could affect enterprise servers, cloud infrastructure, and desktop environments used in business operations, leading to downtime and potential operational losses. Since the vulnerability does not affect confidentiality or integrity, data breaches are unlikely; however, service interruptions could degrade user trust and business continuity. Organizations in sectors such as finance, government, telecommunications, and technology, which heavily rely on Red Hat Enterprise Linux and open-source stacks, may experience higher risk. The remote exploitability without authentication increases the threat surface, particularly for publicly exposed services. The absence of known exploits currently provides a window for proactive mitigation, but the potential for future exploitation remains significant.

1. Apply official patches from Red Hat as soon as they become available to address the use-after-free flaw in libsoup. 2. Until patches are deployed, restrict network exposure of services using libsoup, especially those handling HTTP/2 traffic, by implementing firewall rules or network segmentation. 3. Monitor network traffic for unusual HTTP/2 read and cancel sequences that could indicate exploitation attempts. 4. Employ application-level monitoring and logging to detect crashes or abnormal behavior in GNOME and WebKit-based applications. 5. Consider temporarily disabling or limiting HTTP/2 support in affected applications if feasible, to reduce the attack surface. 6. Conduct thorough testing of updated applications in staging environments to ensure stability post-patch. 7. Educate system administrators and security teams about the vulnerability specifics to enhance detection and response capabilities. 8. Maintain up-to-date inventories of systems running Red Hat Enterprise Linux 10 and dependent applications to prioritize remediation efforts. 9. Collaborate with Red Hat support channels for guidance and early access to fixes or workarounds. 10. Integrate this vulnerability into existing vulnerability management and incident response workflows for continuous risk assessment.