CVE-2013-7445 in Linux
Summary
by MITRE
The Direct Rendering Manager (DRM) subsystem in the Linux kernel through 4.x mishandles requests for Graphics Execution Manager (GEM) objects, which allows context-dependent attackers to cause a denial of service (memory consumption) via an application that processes graphics data, as demonstrated by JavaScript code that creates many CANVAS elements for rendering by Chrome or Firefox.
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Analysis
by VulDB Data Team • 03/04/2025
The vulnerability identified as CVE-2013-7445 resides within the Direct Rendering Manager subsystem of the Linux kernel, specifically affecting versions through 4.x. This flaw manifests in the improper handling of Graphics Execution Manager GEM object requests, creating a significant security concern that impacts the stability and resource management of graphics processing within Linux environments. The issue demonstrates how kernel-level graphics subsystems can be exploited to consume excessive memory resources, leading to system instability and denial of service conditions.
The technical implementation of this vulnerability stems from insufficient validation and resource management within the DRM subsystem's interaction with GEM objects. When applications process graphics data through browsers like Chrome or Firefox, the JavaScript code can create numerous CANVAS elements that trigger the vulnerable kernel paths. This creates a scenario where the kernel fails to properly track or limit the memory consumption associated with these graphics objects, allowing attackers to continuously allocate memory resources without proper bounds checking. The flaw operates at the intersection of kernel graphics management and user-space application processing, making it particularly dangerous as it can be triggered through standard web browsing activities.
The operational impact of this vulnerability extends beyond simple memory exhaustion, as it represents a critical weakness in the Linux graphics stack that can be exploited by context-dependent attackers. The demonstration through JavaScript CANVAS elements shows how web-based attacks can leverage browser rendering engines to indirectly target kernel subsystems, creating a pathway for denial of service attacks that can affect entire systems. This vulnerability affects systems running Linux kernels where DRM and GEM subsystems are actively utilized, particularly those supporting graphics-intensive applications and web browsing environments.
Mitigation strategies for CVE-2013-7445 should focus on kernel updates and proper resource management configurations. System administrators should prioritize applying kernel patches that address the specific GEM object handling flaws within the DRM subsystem, as these updates typically include enhanced memory tracking and resource limitation mechanisms. The vulnerability aligns with CWE-400, which addresses unrestricted resource consumption, and demonstrates characteristics consistent with ATT&CK technique T1499.004 for network denial of service. Organizations should also implement monitoring solutions to detect unusual memory consumption patterns and consider implementing application sandboxing measures to limit the impact of potentially malicious graphics processing operations.