CVE-2026-80647
Received Received - Intake

RDMA/hns Kernel Warning Fix in Poll CQ Direct Mode

Publication date: 2026-08-28

Last updated on: 2026-08-28

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/hns: Fix warning in poll cq direct mode CQs allocated by ib_alloc_cq() always have a comp_handler. Though in direct mode this handler is never expected to be called, it is still called when the driver is reset, triggering the following WARN_ONCE(): Call trace: ib_cq_completion_direct+0x38/0x60 hns_roce_cq_completion+0x54/0x90 (hns_roce_hw_v2] hns_roce_handle_device_err+Ox1c8/0x340 [hns_roce_hw_v2] hns_roce_hw_v2_uninit_instance.constprop.0+0x34/0x70 [hns_roce_hw_v2] hns_roce_hw_v2_reset_notify+0xc4/0xe0 [hns_roce_hw_v2] hclge_notify_roce_client+0x60/0xbc [hclge] hclge_reset_rebuild+0x48/0x34c [hclge] hclge_reset_subtask+0xcc/0xec [hclge] hclge_reset_service_task+0x80/0x160 [hclge] hclge_service_task+0x50/0x80 (hclge] process_one_work+0x1cc/0x4d0 worker_thread+0x154/0x414 kthread+0x104/0x144 ret_from_fork+0x10/0x18

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Meta Information

Published
2026-08-28
Last Modified
2026-08-28
Generated
2026-09-18
AI Q&A
2026-08-28
EPSS Evaluated
2026-09-15
NVD
CVE-2026-80647
EUVD
EUVD-2026-67523

Affected Vendors & Products

Currently, no data is known.

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Exploitability

CWE
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability in the RDMA subsystem affecting the hns driver. It occurs when CQs allocated by ib_alloc_cq() trigger a warning during driver reset in direct mode. The completion handler is called unexpectedly, causing a WARN_ONCE() in ib_cq_completion_direct.

Detection Guidance

This vulnerability is specific to the Linux kernel's RDMA/hns driver and may not have direct detection commands. Monitor kernel logs for warnings related to CQ completion in direct mode or driver resets. Check for messages like 'ib_cq_completion_direct' or 'hns_roce_cq_completion' in dmesg output.

Impact Analysis

This vulnerability may cause kernel warnings during RDMA device resets, potentially disrupting network operations. It does not appear to lead to data breaches or privilege escalation but could affect system stability during recovery scenarios.

Compliance Impact

This vulnerability does not directly affect compliance with GDPR, HIPAA, or similar standards as it is a low-level kernel driver issue in the RDMA subsystem. It may indirectly impact compliance if the affected system is used in environments requiring high availability or data integrity, but no specific compliance impact is documented.

Mitigation Strategies

Apply the latest kernel updates to ensure the fix is in place. If using affected hardware, avoid driver resets or ensure proper handling of CQ completions. Monitor system logs for related errors and consider disabling RDMA/hns if not critical.

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