CVE-2026-68232 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
drm/gpusvm: Fix MM reference leak in drm_gpusvm_range_evict
If kvmalloc_array() fails in drm_gpusvm_range_evict(), the MM reference acquired earlier is not released, resulting in a reference leak.
Fix this by dropping the MM reference on the kvmalloc_array() failure path.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability identified in the Linux kernel's graphics subsystem represents a memory management issue within the direct render manager gpu virtual memory implementation. This flaw exists in the drm_gpusvm_range_evict function where proper resource cleanup is not maintained during error conditions. The problem manifests when the kvmalloc_array() function fails to allocate memory, leaving an acquired memory management reference in an unreleased state. Such reference leaks can accumulate over time and lead to system instability or resource exhaustion.
The technical root cause of this vulnerability stems from improper error handling within the gpu virtual memory management code path. When kvmalloc_array() encounters allocation failure, the function does not execute the necessary cleanup routine to release the previously acquired MM reference. This creates a scenario where memory management resources remain locked in the system's reference count structure, preventing proper deallocation and potentially causing memory leaks that compound over extended system operation periods. The vulnerability aligns with CWE-401 which specifically addresses improper resource release or cleanup issues in software systems.
The operational impact of this vulnerability extends beyond simple memory consumption concerns to potentially affect system stability and performance. In environments where gpu virtual memory operations occur frequently, such as graphics-intensive applications, video rendering, or gaming scenarios, the accumulation of unreleased MM references can lead to gradual memory exhaustion. This degradation manifests as reduced system responsiveness, application crashes, or in extreme cases, complete system lockups. The vulnerability particularly affects systems running linux kernel versions where this specific code path has not been patched.
Security implications arise from the potential for denial-of-service conditions that could be exploited by malicious actors. While the direct attack surface is limited to legitimate system operations involving gpu memory management, an attacker could potentially trigger the vulnerable code path repeatedly to force resource exhaustion. The fix implemented addresses this by ensuring that MM references are properly dropped on all error paths including kvmalloc_array() failure conditions. This remediation aligns with security best practices for resource management and follows established patterns in kernel development for handling allocation failures.
Mitigation strategies should focus on applying the relevant kernel security patches as soon as possible, particularly for systems running affected kernel versions. System administrators should monitor memory usage patterns and implement automated alerting for unusual resource consumption that might indicate reference leak accumulation. The fix itself represents a straightforward defensive programming approach that ensures proper resource cleanup regardless of allocation success or failure states, which aligns with the principle of fail-safe resource management. Organizations maintaining graphics-intensive workloads should prioritize kernel updates to prevent potential exploitation through resource exhaustion attacks.
The vulnerability demonstrates the importance of comprehensive error handling in kernel space code where resource management is critical for system stability. It highlights how seemingly small oversight in error path implementation can lead to significant operational impacts in complex systems. This issue also connects to broader security frameworks such as the ATT&CK matrix's resource exhaustion techniques where adversaries might exploit similar memory management flaws. The fix exemplifies proper defensive programming practices that should be applied across kernel subsystems to prevent similar reference leak scenarios in other components of the operating system stack.