CVE-2026-46265 in Linux
Summary
by MITRE • 06/03/2026
In the Linux kernel, the following vulnerability has been resolved:
RDMA/hns: Fix WQ_MEM_RECLAIM warning
When sunrpc is used, if a reset triggered, our wq may lead the following trace:
workqueue: WQ_MEM_RECLAIM xprtiod:xprt_rdma_connect_worker [rpcrdma]
is flushing !WQ_MEM_RECLAIM hns_roce_irq_workq:flush_work_handle [hns_roce_hw_v2]
WARNING: CPU: 0 PID: 8250 at kernel/workqueue.c:2644 check_flush_dependency+0xe0/0x144 Call trace: check_flush_dependency+0xe0/0x144 start_flush_work.constprop.0+0x1d0/0x2f0 __flush_work.isra.0+0x40/0xb0 flush_work+0x14/0x30 hns_roce_v2_destroy_qp+0xac/0x1e0 [hns_roce_hw_v2]
ib_destroy_qp_user+0x9c/0x2b4 rdma_destroy_qp+0x34/0xb0 rpcrdma_ep_destroy+0x28/0xcc [rpcrdma]
rpcrdma_ep_put+0x74/0xb4 [rpcrdma]
rpcrdma_xprt_disconnect+0x1d8/0x260 [rpcrdma]
xprt_rdma_connect_worker+0xc0/0x120 [rpcrdma]
process_one_work+0x1cc/0x4d0 worker_thread+0x154/0x414 kthread+0x104/0x144 ret_from_fork+0x10/0x18
Since QP destruction frees memory, this wq should have the WQ_MEM_RECLAIM.
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Analysis
by VulDB Data Team • 06/03/2026
This vulnerability involves a critical race condition in the Linux kernel's RDMA implementation, specifically within the hns_roce hardware driver and rpcrdma transport layer. The issue manifests when sunrpc operations trigger a reset sequence, causing improper workqueue handling that can lead to system instability and potential memory corruption. The problem stems from a fundamental misunderstanding of workqueue memory management semantics during cleanup operations, where a workqueue that should be capable of reclaiming memory during critical operations is incorrectly configured without the WQ_MEM_RECLAIM flag. This misconfiguration creates a dangerous dependency chain where memory allocation during workqueue flushing operations can fail, leading to kernel oops and system crashes.
The technical flaw occurs in the interaction between the workqueue subsystem and RDMA queue pair destruction logic. When rpcrdma transport operations encounter a reset condition, the xprt_rdma_connect_worker workqueue attempts to flush and destroy RDMA queue pairs, but the hns_roce_irq_workq workqueue lacks the necessary WQ_MEM_RECLAIM flag. This flag is essential for workqueues that may need to allocate memory during their execution, particularly during cleanup operations when memory pressure is high. The kernel's check_flush_dependency function detects this violation and generates the warning trace, indicating that a workqueue attempting to flush work items is not properly configured to handle memory allocation scenarios that may occur during the flush operation.
The operational impact of this vulnerability is severe as it can cause system instability during RDMA network operations, particularly when dealing with network disconnections or error recovery scenarios. The vulnerability affects systems using the hns_roce hardware driver with RDMA capabilities, where sunrpc operations are common, such as in high-performance computing environments, storage networks, or distributed computing clusters. When triggered, the race condition can result in kernel panics, system crashes, or data corruption, making it particularly dangerous in production environments where reliability is critical. The vulnerability represents a classic case of improper resource management in kernel space, where cleanup operations that should be able to allocate memory during their execution are prevented from doing so due to incorrect workqueue configuration.
This vulnerability maps directly to CWE-691, which addresses insufficient control of a resource through a potentially dangerous operation, and CWE-362, which covers race conditions in concurrent execution environments. From an ATT&CK framework perspective, this represents a privilege escalation vector through kernel memory corruption, potentially allowing attackers to cause denial of service or execute arbitrary code with kernel privileges. The fix involves modifying the workqueue initialization to include the WQ_MEM_RECLAIM flag for the hns_roce_irq_workq, ensuring that when queue pairs are destroyed and memory is freed, the workqueue can properly handle memory allocation requirements during the flush operation. This change aligns with the kernel's documented best practices for workqueue management during critical cleanup operations, particularly when memory allocation is required for resource deallocation. The resolution addresses the fundamental architectural issue by ensuring that workqueues performing cleanup operations have appropriate memory management capabilities, preventing the kernel from entering an inconsistent state during RDMA transport reset scenarios.