CVE-2026-64534
Vulnerability Scoring
Analysis In Progress
CVE-2026-64534 Vulnerability Analysis & Exploit Details
CVE-2026-64534
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-64534 Details
Status: Received on 27 Jul 2026, 08:16 UTC
Published on: 27 Jul 2026, 08:16 UTC
CVSS Release:
CVE-2026-64534 Vulnerability Summary
CVE-2026-64534: 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().
Assessing the Risk of CVE-2026-64534
Access Complexity Graph
The exploitability of CVE-2026-64534 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).
Exploitability Analysis for CVE-2026-64534
No exploitability data is available for CVE-2026-64534.
Understanding AC and PR
A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.
Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.
Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.
CVSS Score Breakdown Chart
Above is the CVSS Sub-score Breakdown for CVE-2026-64534, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.
CIA Impact Analysis
Below is the Impact Analysis for CVE-2026-64534, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-64534 does not compromise confidentiality.
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Integrity:
None
CVE-2026-64534 does not impact data integrity.
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Availability:
None
CVE-2026-64534 does not affect system availability.
CVE-2026-64534 References
External References
- https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
- https://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f
- https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8
- https://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e
- https://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b
- https://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc
- https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1
CWE Common Weakness Enumeration
Unknown
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