CVE-2026-72087 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
scsi: lpfc: Fix memory leak in lpfc_sli4_driver_resource_setup()
The memory allocated for mboxq using mempool_alloc() is not freed in some of the early exit error paths. Fix that by moving the mempool_free() call to an earlier point after last use.
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Analysis
by VulDB Data Team • 08/15/2026
This vulnerability resides within the Linux kernel's SCSI subsystem, specifically affecting the lpfc driver which manages Fibre Channel host bus adapters. The issue represents a classic memory leak scenario where allocated resources are not properly released during error conditions, creating persistent resource exhaustion that can degrade system performance over time. The flaw manifests in the lpfc_sli4_driver_resource_setup() function where memory allocation occurs through mempool_alloc() for mboxq structures but fails to release these allocations in certain early exit paths. This type of vulnerability falls under CWE-401 Memory Leak, which is categorized as a fundamental resource management error that can lead to system instability and potential denial of service conditions.
The technical implementation flaw occurs when the driver initialization process encounters errors during setup operations but does not properly execute cleanup routines for previously allocated memory. The mempool_alloc() function allocates memory from a pre-configured memory pool specifically designed for efficient allocation of frequently used kernel structures, but subsequent error handling paths fail to invoke mempool_free() which would return the memory back to the pool for reuse. This creates a situation where system memory becomes progressively consumed by unreleased allocations, particularly problematic in long-running systems or those under heavy I/O load where the driver may be initialized and torn down repeatedly.
The operational impact of this vulnerability extends beyond simple memory consumption, as it can lead to progressive system degradation and potential system crashes when memory pressure reaches critical levels. In enterprise environments running multiple SCSI devices or high-throughput storage workloads, the cumulative effect of these leaks can result in reduced system responsiveness, increased swap activity, and ultimately complete system failure if the kernel's memory management becomes exhausted. The vulnerability affects systems using lpfc driver versions that support SLI4 architecture, which includes numerous enterprise storage solutions from various vendors, making this a widespread concern across production environments.
Mitigation strategies should focus on immediate patch application through kernel updates that properly restructure the error handling paths to ensure mempool_free() is called regardless of execution flow. The fix involves relocating the memory deallocation call to occur before any early exit points, ensuring proper resource cleanup even when errors occur during driver initialization. System administrators should also implement monitoring solutions to detect memory usage patterns and identify potential leak accumulation, while maintaining regular kernel update schedules to address similar issues proactively. From an ATT&CK perspective, this vulnerability could be leveraged in resource exhaustion attacks where adversaries deliberately trigger the error paths repeatedly to consume system resources, though the primary concern remains legitimate operational degradation rather than malicious exploitation.