What is CVE-2026-23221?

CVE-2026-23221 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. bus: fsl-mc: fix use-after-free in driver_override_show()

Which CVE IDs does CVE-2026-23221 cover?

CVE-2026-23221 covers the following CVE IDs: CVE-2026-23221. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-23221?

CVE-2026-23221 has a CVSS v3 base score of 7.0, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-23221?

CVE-2026-23221 affects 3 products, including: azl3 kernel 6.6.121.1-1 on Azure Linux 3.0; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0.

CVE-2026-23221HighCVSS 7.0

bus: fsl-mc: fix use-after-free in driver_override_show()

Vendor

Microsoft Security Response Center (MSRC)

Published

February 21, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-23221 →

🎯 Affected products3

azl3 kernel 6.6.121.1-1 on Azure Linux 3.0
azl3 kernel 6.6.126.1-1 on Azure Linux 3.0
cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.130.1-1 KBCBL-Mariner Releases (Security Update) — fixed build 5.15.202.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23221
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade