CVE-2023-53528: RDMA/rxe: Fix unsafe drain work queue code

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2025-10-01 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Fix unsafe drain work queue code If create_qp does not fully succeed it is possible for qp cleanup code to attempt to drain the send or recv work queues before the queues have been created causing a seg fault. This patch checks to see if the queues exist before attempting to drain them.

Affected products

Linux kernel: from 6.4 before 6.4.16; from 6.5 before 6.5.3 — fixed in 6.4.16, 6.5.3

How to fix

Upgrade to a fixed version: Linux kernel 6.4.16, 6.5.3. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/5993b75d0bc71cd2b441d174b028fc36180f032c
https://git.kernel.org/stable/c/d366642b3099bd322375f5b71ba84ab1d586cd6d
https://git.kernel.org/stable/c/da572f6313aeead1f79e0810666bd8d8ffc794d4

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