What is CVE-2026-45858?

CVE-2026-45858 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1

Which CVE IDs does CVE-2026-45858 cover?

CVE-2026-45858 covers the following CVE IDs: CVE-2026-45858. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-45858?

CVE-2026-45858 has a CVSS v3 base score of 5.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-45858?

CVE-2026-45858 affects 1 product, including: azl3 kernel 6.6.139.1-1 on Azure Linux 3.0.

CVE-2026-45858MediumCVSS 5.5

ext4: don't zero the entire extent if EXT4_EXT_DATA_PARTIAL_VALID1

Vendor

Microsoft Security Response Center (MSRC)

Published

May 28, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-45858 →

🎯 Affected products1

azl3 kernel 6.6.139.1-1 on Azure Linux 3.0

🔗 References (1)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-45858