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CVE-2026-64321— nvme: target: rdma: fix ndev refcount leak on queue connect

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于nvmet_rdma_queue_connect函数在主机队列超限返回busy时未释放ndev引用，导致引用泄漏。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 13

VendorProduct Version RangeStatus
Linux Linux 28877977bbc4f44dd3068b74ee781466c597a3b3< 204b9645536bb4a77a2cb35e6519dbf9f4ea1665 affected
bd3f40fdec552f9200e7b8521ef02b578c9ee8b0< 00eaa58988d35fd47ca8811f7f72871591f61ffb affected
85a79da286b65ae2238a22ac901a0039779e613e< 712f3268a62d0df98a7ee991cba963ced2e58007 affected
31deaeb11ba7a885116c9c30892b9f763c04d59c< d65fe42820b890a6a4644de0a95a812471f79ad3 affected
31deaeb11ba7a885116c9c30892b9f763c04d59c< a8803c4f0ac3fa7df5551bbb5a8800c434a94357 affected
31deaeb11ba7a885116c9c30892b9f763c04d59c< 5828517d17eda27f21d29ea14800c9e0a57bad11 affected
31deaeb11ba7a885116c9c30892b9f763c04d59c< badc53620fe813b3a9f727ef9526f98567c2c898 affected
6.8 affected
… +5 more rows
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I. Basic Information for CVE-2026-64321

Vulnerability Information
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Vulnerability Title
nvme: target: rdma: fix ndev refcount leak on queue connect
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 6.8版本存在安全漏洞，该漏洞源于nvmet_rdma_queue_connect函数在主机队列超限返回busy时未释放ndev引用，导致引用泄漏。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 28877977bbc4f44dd3068b74ee781466c597a3b3 ~ 204b9645536bb4a77a2cb35e6519dbf9f4ea1665 -
Linux Linux 6.8 -

II. Public POCs for CVE-2026-64321

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III. Intelligence Information for CVE-2026-64321

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Patches & Fixes for CVE-2026-64321 (6)

Same Patch Batch · Linux · 2026-07-25 · 274 CVEs total

CVE-2026-64355 9.8 CRITICAL bpf: Reject fragmented frames in devmap
CVE-2026-64459 9.8 CRITICAL tcp: restore RCU grace period in tcp_ao_destroy_sock
CVE-2026-64303 9.8 CRITICAL spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
CVE-2026-64439 9.8 CRITICAL crypto: krb5 - filter out async aead implementations at alloc
CVE-2026-64410 9.8 CRITICAL netfilter: flowtable: IPIP tunnel hardware offload is not yet support
CVE-2026-64399 9.8 CRITICAL ksmbd: add permission checks for FSCTL_DUPLICATE_EXTENTS_TO_FILE
CVE-2026-64397 9.8 CRITICAL ksmbd: serialize QUERY_DIRECTORY requests per file
CVE-2026-64391 9.8 CRITICAL ksmbd: use opener credentials for ADS I/O
CVE-2026-64387 9.8 CRITICAL smb: client: fix query directory replay double-free
CVE-2026-64386 9.8 CRITICAL smb: client: fix query_info() replay double-free
CVE-2026-64385 9.8 CRITICAL smb: client: fix double-free in SMB2_ioctl() replay
CVE-2026-64383 9.8 CRITICAL smb: client: fix double-free in SMB2_flush() replay
CVE-2026-64384 9.8 CRITICAL smb: client: fix change notify replay double-free
CVE-2026-64268 9.8 CRITICAL RDMA/siw: bound Read Response placement to the RREAD length
CVE-2026-64523 9.8 CRITICAL net/handshake: Take a long-lived file reference at submit
CVE-2026-64269 9.1 CRITICAL RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg
CVE-2026-64257 9.1 CRITICAL smb: client: reject overlapping data areas in SMB2 responses
CVE-2026-64319 9.1 CRITICAL nvmet-auth: validate reply message payload bounds against transfer length
CVE-2026-64320 9.1 CRITICAL nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page
CVE-2026-64393 9.1 CRITICAL ksmbd: run set info with opener credentials

Showing top 20 of 274 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64321

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