CVE-2026-46181: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
In the Linux kernel, the following vulnerability has been resolved:
RDMA/mlx4: Fix mis-use of RCU in mlx4srqevent()
Sashiko points out the radixtree itself is RCU safe, but nothing ever frees the mlx4srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing.
Use the spinlock since it isn't easy to make RCU work, use refcountincnotzero() to protect against partially initialized objects, and order the refcountset() to be after the srq is fully initialized.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-46181?
CVE-2026-46181 has a high severity rating of 7.8.
How do I fix CVE-2026-46181?
The fix for CVE-2026-46181 involves updating to a patched version of the Linux kernel.
What type of systems are affected by CVE-2026-46181?
CVE-2026-46181 affects systems running certain versions of the Linux kernel utilizing RDMA/mlx4.
What is the risk associated with CVE-2026-46181?
The risk associated with CVE-2026-46181 is rated at 69, indicating a significant potential impact if exploited.
What are the implications of CVE-2026-46181 on system security?
CVE-2026-46181 may lead to exposure of sensitive information or denial of service in affected systems.