Cloud Vulnerability DB
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Vulnerability DatabaseCVE-2025-21714
CVE-2025-21714:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2025-21714 affects the Linux kernel's RDMA/mlx5 driver, specifically related to implicit ODP (On-Demand Paging) memory region handling. The vulnerability was discovered in January 2025 and involves a use-after-free condition in the memory region destruction process (Kernel Git).
Technical details
The vulnerability stems from a race condition in the implicit ODP memory region destruction process. The issue occurs when there's a possibility of double queueing of implicit ODP MR destroy work, which can lead to the second work executing after the MR was freed by the first work. This results in a use-after-free condition and a refcount_t underflow (Kernel Git).
Impact
The vulnerability can lead to use-after-free conditions in the kernel's RDMA subsystem, potentially causing system instability or crashes. This is evidenced by the reported refcount_t underflow and subsequent warning messages in the kernel logs (Kernel Git).
Mitigation and workarounds
The issue has been fixed by implementing proper locking mechanisms and using _xacmpxchg() to prevent double queueing of the destroy work. The fix ensures atomic operations when handling the implicit ODP memory region destruction (Kernel Git).
Additional resources
Source: This report was generated using AI
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