CVE-2026-72041 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
espintcp: use sk_msg_free_partial to fix partial send
sk_msg_free_partial() ensures consistency of the skmsg at every iteration, without having to manually handle uncharges and offsets. This simplifies the code, and fixes some bugs in skmsg accounting when we don't send the full contents.
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability addressed in this linux kernel patch relates to improper memory management within the espintcp subsystem, specifically concerning how socket messages are handled during partial sends. The issue stems from inadequate accounting mechanisms that fail to properly maintain consistency in socket message structures when only portions of data are transmitted. This problem affects the kernel's ability to correctly manage memory resources and track message boundaries during network operations.
The technical flaw manifests in the skmsg (socket message) accounting system where manual handling of uncharges and offsets becomes error-prone and inconsistent. When partial sends occur, the system must properly adjust message metadata and release appropriate resources without leaving the socket message structure in an inconsistent state. Without proper automated mechanisms, the kernel's memory management can become corrupted or leave dangling references that may lead to memory leaks or potential exploitation vectors.
This vulnerability impacts the operational stability of network operations within linux systems, particularly affecting applications that rely on tcp connections where partial data transmission occurs frequently. The improper handling of socket message accounting can result in resource exhaustion, memory corruption, or unpredictable behavior during network communication. Systems running affected kernel versions may experience degraded performance or potential security risks due to memory management inconsistencies.
The fix implements sk_msg_free_partial() which provides an automated mechanism for maintaining socket message consistency throughout iterations. This function ensures that proper uncharging and offset handling occurs automatically without manual intervention from the calling code, thereby eliminating the race conditions and accounting errors that could previously occur. The solution reduces code complexity while providing more reliable memory management for partial send operations.
This vulnerability aligns with common weakness enumerations related to memory management issues and improper resource handling within kernel space. The fix addresses potential attack vectors that could be exploited through carefully crafted network traffic that triggers partial send scenarios, making it relevant to both availability and potentially confidentiality considerations in network security. The implementation follows established patterns for kernel memory management and aligns with best practices for maintaining data structure integrity during asynchronous operations.
The resolution represents a defensive programming approach that reduces the attack surface by eliminating manual resource management errors. This change improves the overall robustness of the linux networking stack and demonstrates proper adherence to kernel development standards where automated cleanup mechanisms are preferred over manual resource handling. The solution ensures that even under adverse conditions or with malformed inputs, the socket message structures remain consistent and properly managed throughout the send process.