CVE-2026-64534: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
CVE-2026-64534 is a vulnerability in nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path, rated Moderate by Microsoft, with a CVSS 3.1 base score of 6.5 (Medium). An attacker can exploit it from an adjacent network, without any privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.32% probability of exploitation activity in the next 30 days, higher than 26% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).
Key facts
- CVE ID
- CVE-2026-64534
- Severity
- Medium CVSS 6.5
- Microsoft severity
- Moderate
- Exploited in the wild
- No
- Publicly disclosed
- No
- Weakness
- CWE-667
- EPSS
- 0.32% (percentile 26%)
- CISA KEV
- Not listed
- Released
- Last updated
- Patch Tuesday
- July 2026 Patch Tuesday
- Product families
- Open Source Software
CVSS score and vector
Microsoft scores CVE-2026-64534 at 6.5 (temporal 6.5) using CVSS 3.1. Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
| Metric | Value |
|---|---|
| Attack vector | Adjacent network |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality impact | None |
| Integrity impact | None |
| Availability impact | High |
NVD scores it 9.8 (CRITICAL) with CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products (1)
Open Source Software
| Product | Security update | Type | Fixed build | Restart |
|---|---|---|---|---|
| azl3 kernel 6.6.145.2-1 on Azure Linux 3.0 | CBL-Mariner Releases | Security Update | 6.6.150.1-1 | No |
NIST NVD data
- NVD status
- Awaiting Analysis
- NVD CVSS
- 9.8 (CRITICAL)
- NVD weakness
- CWE-667
- Published to NVD
- NVD last modified
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
Revision history
| Version | Date | Description |
|---|---|---|
| 1.0 | Information published. | |
| 2.0 | Information published. |