What is CVE-2025-40164?

CVE-2025-40164 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. usbnet: Fix using smp_processor_id() in preemptible code warnings

Which CVE IDs does CVE-2025-40164 cover?

CVE-2025-40164 covers the following CVE IDs: CVE-2025-40164. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-40164?

CVE-2025-40164 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-40164?

CVE-2025-40164 affects 6 products, including: azl3 kernel 6.6.112.1-2 on Azure Linux 3.0; azl3 kernel 6.6.117.1-1 on Azure Linux 3.0; azl3 kernel 6.6.119.3-1 on Azure Linux 3.0; azl3 kernel 6.6.119.3-3 on Azure Linux 3.0; azl3 kernel 6.6.121.1-1 on Azure Linux 3.0; and others — see the full list on the advisory page.

CVE-2025-40164MediumCVSS 5.5

usbnet: Fix using smp_processor_id() in preemptible code warnings

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2025-40164 →

🎯 Affected products6

azl3 kernel 6.6.112.1-2 on Azure Linux 3.0
azl3 kernel 6.6.117.1-1 on Azure Linux 3.0
azl3 kernel 6.6.119.3-1 on Azure Linux 3.0
azl3 kernel 6.6.119.3-3 on Azure Linux 3.0
azl3 kernel 6.6.121.1-1 on Azure Linux 3.0
cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.126.1-1 KBCBL-Mariner Releases (Security Update) — fixed build 5.15.200.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40164
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade