Missing Release of Resource after Effective Lifetime in Linux kernel - CVE-2026-64321

Vulnerability identifier: #VU139659

CSH Severity: Medium

CVSS v4: 6.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-64321

CWE-ID: CWE-772

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to a reference count leak in nvmet_rdma_queue_connect() in the nvme target rdma component when handling queue connect requests while the host queue backlog is exceeded. A remote attacker can send connection requests that trigger the busy return path to cause a denial of service.

Linux kernel
Ubuntu
linux (Ubuntu package)
linux-azure (Ubuntu package)
linux-gcp-7.0 (Ubuntu package)
linux-oracle-7.0 (Ubuntu package)
linux-oem-7.0 (Ubuntu package)
linux-azure-7.0 (Ubuntu package)

Install security update from vendor's repository.

Linux kernel - update to 7.0 rc3
linux (Ubuntu package) - addressed in versions 7.0.0-31.31, 7.0.0-31.31.1, 7.0.0-31.31~24.04.1, 7.0.0-1006.7, 7.0.0-1011.11~24.04.1, 7.0.0-1012.12, 7.0.0-1012.12~24.04.1
linux-azure (Ubuntu package) - addressed in versions 7.0.0-1011.11, 7.0.0-1014.14
linux-gcp-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oracle-7.0 (Ubuntu package) - update to 7.0.0-1011.11~24.04.1
linux-oem-7.0 (Ubuntu package) - update to 7.0.0-1013.13
linux-azure-7.0 (Ubuntu package) - update to 7.0.0-1014.14~24.04.1

• https://git.kernel.org/stable/c/5828517d17eda27f21d29ea14800c9e0a57bad11
• https://git.kernel.org/stable/c/a8803c4f0ac3fa7df5551bbb5a8800c434a94357
• https://git.kernel.org/stable/c/badc53620fe813b3a9f727ef9526f98567c2c898
• https://git.kernel.org/stable/c/d65fe42820b890a6a4644de0a95a812471f79ad3

• Missing Release of Resource after Effective Lifetime in Linux kernel nvme target driver
• Ubuntu update for linux-oem-7.0
• Ubuntu update for linux
• Ubuntu update for linux-gcp-7.0
• Ubuntu update for linux-oracle-7.0
• Ubuntu update for linux-azure
• Ubuntu update for linux-azure-7.0