High [CVE-2025-12105] Libsoup: heap use-after-free in libsoup message queue handling during http/2 read completion

A flaw was found in the asynchronous message queue handling of the libsoup library, widely used by GNOME and WebKit-based applications to manage HTTP/2 communications. When network operations are aborted at specific timing intervals, an internal message queue item may be freed twice due to missing state synchronization.

This leads to a use-after-free memory access, potentially crashing the affected application. Attackers could exploit this behavior remotely by triggering specific HTTP/2 read and cancel sequences, resulting in a denial-of-service condition.

The Red Hat Product Security team has assessed the severity of this vulnerability as High, as it can be triggered remotely without authentication or user interaction, leading to the crash of applications or network services relying on libsoup for HTTP/2 processing.

While there is no evidence of code execution or system compromise, the flaw results in a complete denial-of-service of affected processes, which can disrupt service availability in production environments. Red Hat severity: Moderate — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-416. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 6.

Red Hat lists Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.