Bug 2507299 (CVE-2026-64321)

Summary: CVE-2026-64321 kernel: nvme: target: rdma: fix ndev refcount leak on queue connect
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the NVMe over RDMA (nvmet_rdma) target in the Linux kernel. When a host queue backlog is exceeded during a connection attempt, a reference count (kref) is not properly released. This oversight can lead to a resource exhaustion vulnerability, potentially allowing a remote attacker to cause a Denial of Service (DoS) by depleting system resources.
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Description OSIDB Bzimport 2026-07-25 10:15:14 UTC 
In the Linux kernel, the following vulnerability has been resolved:

nvme: target: rdma: fix ndev refcount leak on queue connect

nvmet_rdma_queue_connect() calls nvmet_rdma_find_get_device() which
acquires a reference on the returned ndev via kref_get(). On the path
where the host queue backlog is exceeded and the function returns
NVME_SC_CONNECT_CTRL_BUSY, reference of ndev is not released, leaking
the kref.

Fix this by adding a goto to the existing put_device label before the
early return.
Comment 1 TEJ RATHI 2026-07-27 06:09:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026072511-CVE-2026-64321-4f63@gregkh/T