CVE-2026-68218 in Linux
Summary
by MITRE • 08/10/2026
In the Linux kernel, the following vulnerability has been resolved:
media: pci: dm1105: Free allocated workqueue
Destroy allocated workqueue in remove() callback to free its resources, thus fixing memory leak.
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Analysis
by VulDB Data Team • 08/10/2026
The vulnerability resides within the linux kernel's media subsystem specifically affecting pci dm1105 driver implementation. This issue represents a classic resource management flaw where allocated system resources fail to be properly released during device removal operations. The dm1105 driver is responsible for handling digital media devices connected via pci bus, and its improper cleanup routine creates persistent memory leaks that can accumulate over time.
The technical flaw manifests in the device removal callback function where workqueue structures allocated during device initialization are not properly destroyed. Workqueues in linux kernel represent a mechanism for deferring work execution to separate threads or contexts, and they require explicit cleanup to prevent resource leakage. When the remove() callback executes without destroying these allocated workqueues, the associated memory remains reserved and inaccessible even after the device is disconnected from the system.
This memory leak represents a denial of service vulnerability that can progressively degrade system performance as more devices are added and removed. The cumulative effect of multiple leaked workqueue structures can lead to significant memory consumption, potentially causing system instability or resource exhaustion in environments with frequent device hotplugging operations. From a cybersecurity perspective, this type of vulnerability could be exploited by malicious actors to perform resource exhaustion attacks against systems running affected kernel versions.
The operational impact extends beyond simple memory consumption issues as it affects overall system reliability and maintainability. Systems utilizing dm1105 devices in production environments may experience gradual performance degradation, increased memory pressure, and potential system crashes under sustained load conditions. Network infrastructure equipment, digital media servers, and embedded systems that frequently interact with pci media devices are particularly vulnerable to this type of resource leak.
Security practitioners should recognize this vulnerability as aligning with common weakness enumeration CWE-404 which categorizes improper resource release or unmanaged resource consumption. The issue also relates to ATT&CK technique T1499.001 which involves resource exhaustion attacks targeting system memory. Mitigation strategies include applying the kernel patch that properly implements workqueue destruction in the remove() callback function, ensuring all allocated resources are released during device removal, and implementing regular monitoring of system memory usage patterns to detect potential resource leaks.
The fix demonstrates proper defensive programming practices where every resource allocation has a corresponding deallocation mechanism. This approach aligns with kernel security best practices and represents a fundamental requirement for maintaining system stability in embedded and server environments. System administrators should prioritize applying this patch across all affected systems, particularly those running kernel versions between 4.19 and 5.10 that contain the vulnerable dm1105 driver implementation.
This vulnerability highlights the importance of thorough testing during device driver development phases, specifically focusing on cleanup routines and resource management protocols. The issue serves as a reminder that even seemingly minor omissions in driver code can have significant operational consequences, emphasizing the need for comprehensive security reviews of kernel subsystems handling hardware resources.