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CVE-2026-64534

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path In nvmet_tcp_try_recv_ddgst(), when a data digest mis…

Published Jul 27, 2026EPSS 0.42%

Overview

CVE-2026-64534 is a critical-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path

In nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected,

nvmet_req_uninit() is called unconditionally. However, if the command

arrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init()

had returned false and percpu_ref_tryget_live() was never executed. The

unconditional percpu_ref_put() inside nvmet_req_uninit() then causes a

refcount underflow, leading to a WARNING in

percpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and

eventually a permanent workqueue deadlock.

Check cmd->flags & NVMET_TCP_F_INIT_FAILED before calling

nvmet_req_uninit(), matching the existing pattern in

nvmet_tcp_execute_request().

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decfRefgit.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345fRefgit.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8Refgit.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4eRefgit.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08bRefgit.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bcRefgit.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1

How CyberStrike helps

Frequently asked questions

What is CVE-2026-64534?

CVE-2026-64534 is a critical-severity vulnerability. It was published on July 27, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64534?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-64534?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-64534?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-64534 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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