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CVE-2023-54201: RDMA/efa: Fix wrong resources deallocation order

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-30 · updated 2026-10-28

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/efa: Fix wrong resources deallocation order When trying to destroy QP or CQ, we first decrease the refcount and potentially free memory regions allocated for the object and then request the device to destroy the object. If the device fails, the object isn't fully destroyed so the user/IB core can try to destroy the object again which will lead to underflow when trying to decrease an already zeroed refcount. Deallocate resources in reverse order of allocating them to safely free them.

Affected products

• Linux kernel: 5.7 — fixed in 6.6

How to fix

Upgrade to a fixed version: Linux kernel 6.6. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/24f9884971f9b34915b67baacf7350a3f6f19ea4
• https://git.kernel.org/stable/c/cf38960386f3cc4abf395e556af915e4babcafd2
• https://git.kernel.org/stable/c/dc202c57e9a1423aed528e4b8dc949509cd32191
• https://git.kernel.org/stable/c/e79db2f51a564fd4daa3e508b987df5e81c34b20

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