CVE-2026-68084 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
staging: vme_user: fix location monitor leak in tsi148 bridge
tsi148_probe() allocates a location monitor resource and links it into tsi148_bridge->lm_resources. The probe error path frees this list, but tsi148_remove() only frees the dma, slave and master resource lists, so the location monitor resource is leaked on device unbind or module unload.
Free the lm_resources list in tsi148_remove() as well, before tsi148_bridge is freed.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability identified in the Linux kernel represents a memory leak within the staging subsystem, specifically affecting the vme_user driver component that interfaces with the tsi148 bridge hardware. This issue manifests when the tsi148_probe function properly allocates and links location monitor resources into the tsi148_bridge->lm_resources list during device initialization. The fundamental flaw lies in the inconsistent resource management approach between successful probe completion and error path handling versus the device removal sequence. While the probe error path correctly frees the entire list including location monitors, the tsi148_remove function fails to address this specific resource category during device unbinding or module unload operations.
The technical implementation of this vulnerability stems from incomplete cleanup routines within the driver's removal pathway. During normal operation, when tsi148_probe() successfully initializes the bridge hardware, it allocates memory for location monitor resources and properly links them into the lm_resources list structure. However, when tsi148_remove() executes during device teardown, it only processes and frees dma, slave, and master resource lists while completely neglecting to clean up the lm_resources list that was allocated during probe initialization. This oversight results in a classic memory leak pattern where allocated kernel memory remains unreleased even though the device has been successfully removed from the system.
The operational impact of this vulnerability extends beyond simple memory consumption concerns as it represents a potential vector for resource exhaustion attacks targeting embedded systems or virtualized environments where kernel memory management is critical. The leaked location monitor resources accumulate each time the device is bound and subsequently unbound, leading to progressive memory degradation that could ultimately impact system stability and performance. This type of vulnerability aligns with common software security principles and represents a failure in proper resource lifecycle management, which is categorized under CWE-404 as improper resource release or unmanaged resource.
From an attack perspective, this memory leak vulnerability would typically fall within the ATT&CK framework's T1070.004 technique category related to indicator removal on host, though its primary impact manifests as a denial of service through resource exhaustion rather than direct exploitation. The vulnerability requires either device unbinding or module reload operations to be triggered, making it more suitable for scenarios where devices are frequently reconfigured or modules are dynamically loaded and unloaded. Security practitioners should consider this issue when evaluating system stability in environments that heavily utilize VME bus interfaces or embedded hardware management components.
The remediation approach involves implementing proper resource cleanup within the tsi148_remove() function by ensuring that the lm_resources list is freed before the parent tsi148_bridge structure itself gets released. This fix aligns with established kernel development practices and security guidelines for memory management, requiring minimal code changes to address the root cause while maintaining full backward compatibility. The solution demonstrates proper defensive programming principles where all allocated resources must be freed during cleanup operations regardless of the execution path taken during device lifecycle management.