What is CVE-2025-40243?

CVE-2025-40243 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. hfs: fix KMSAN uninit-value issue in hfs_find_set_zero_bits()

Which CVE IDs does CVE-2025-40243 cover?

CVE-2025-40243 covers the following CVE IDs: CVE-2025-40243. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2025-40243?

CVE-2025-40243 has a CVSS v3 base score of 6.6, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2025-40243?

CVE-2025-40243 affects 1 product, including: azl3 kernel 6.6.112.1-2 on Azure Linux 3.0.

CVE-2025-40243MediumCVSS 6.6

hfs: fix KMSAN uninit-value issue in hfs_find_set_zero_bits()

Vendor

Microsoft Security Response Center (MSRC)

Published

December 6, 2025

Last Modified

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🔗 CVE IDs covered (1)

CVE-2025-40243 →

🎯 Affected products1

azl3 kernel 6.6.112.1-2 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.117.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-40243
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade