What is CVE-2026-27456?

CVE-2026-27456 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup

Which CVE IDs does CVE-2026-27456 cover?

CVE-2026-27456 covers the following CVE IDs: CVE-2026-27456. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-27456?

CVE-2026-27456 has a CVSS v3 base score of 4.7, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-27456?

CVE-2026-27456 affects 4 products, including: azl3 util-linux 2.40.2-3 on Azure Linux 3.0; azl3 util-linux 2.40.2-4 on Azure Linux 3.0; cbl2 util-linux 2.37.4-10 on CBL Mariner 2.0; cbl2 util-linux 2.37.4-10 on CBL-Mariner 2.0.

CVE-2026-27456MediumCVSS 4.7

util-linux: TOCTOU Race Condition in util-linux mount(8) - Loop Device Setup

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-27456 →

🎯 Affected products4

azl3 util-linux 2.40.2-3 on Azure Linux 3.0
azl3 util-linux 2.40.2-4 on Azure Linux 3.0
cbl2 util-linux 2.37.4-10 on CBL Mariner 2.0
cbl2 util-linux 2.37.4-10 on CBL-Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 2.40.2-4 KBCBL-Mariner Releases (Security Update) — fixed build 2.37.4-11 KBRelease Notes (Security Update) — fixed build 2.37.4-11

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27456
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade