CVE-2025-22071 in Linux
Summary
by MITRE • 04/16/2025
In the Linux kernel, the following vulnerability has been resolved:
spufs: fix a leak in spufs_create_context()
Leak fixes back in 2008 missed one case - if we are trying to set affinity and spufs_mkdir() fails, we need to drop the reference to neighbor.
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Analysis
by VulDB Data Team • 02/15/2026
The vulnerability identified as CVE-2025-22071 represents a memory leak within the Linux kernel's spufs subsystem, specifically affecting the spufs_create_context() function. This issue stems from an incomplete fix that was initially implemented in 2008, demonstrating how legacy code modifications can leave residual vulnerabilities that persist across kernel versions. The spufs subsystem provides support for the Cell Broadband Engine architecture's SPU (Synergistic Processing Unit) filesystem, which is critical for high-performance computing environments utilizing this specialized processor architecture.
The technical flaw occurs when the spufs_mkdir() function fails during the process of setting affinity for SPU contexts. In this specific failure scenario, the code path does not properly release a reference to a neighbor object, resulting in a memory leak that accumulates over time. This leak represents a classic resource management issue where allocated memory is not properly deallocated, creating a gradual degradation of system performance. The vulnerability manifests when the system attempts to create SPU contexts with specific affinity settings, and the directory creation operation fails for any reason, such as permission issues, resource exhaustion, or filesystem errors.
The operational impact of this memory leak extends beyond simple resource consumption, potentially leading to system instability and performance degradation in environments heavily utilizing the Cell Broadband Engine architecture. Attackers could exploit this vulnerability by repeatedly triggering the failure condition, causing progressive memory exhaustion that might lead to system crashes or denial of service conditions. The vulnerability is particularly concerning in high-performance computing clusters, embedded systems, and server environments where SPU contexts are frequently created and destroyed. According to CWE classification, this represents a CWE-401: Improper Release of Memory Before Removing Last Reference, which falls under the broader category of memory management flaws that can be exploited to compromise system stability and availability.
Mitigation strategies for CVE-2025-22071 should focus on applying the kernel patch that properly releases the neighbor reference when spufs_mkdir() fails, ensuring that all code paths through spufs_create_context() correctly handle resource cleanup. System administrators should prioritize updating their kernel versions to include the fix, particularly in production environments where the Cell Broadband Engine is actively utilized. The fix aligns with ATT&CK technique T1499.004 by addressing resource exhaustion vulnerabilities that could be leveraged for denial of service attacks. Organizations should also implement monitoring for memory usage patterns in systems utilizing SPU contexts, as unusual memory growth could indicate exploitation attempts. Additionally, comprehensive testing should validate that the fix does not introduce regressions in SPU context creation functionality, ensuring continued system stability while eliminating the memory leak vulnerability.