What is CVE-2026-99999?

CVE-2026-99999 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. ipv4: validate checksum_start before completing checksum

Which CVE IDs does CVE-2026-99999 cover?

CVE-2026-99999 covers the following CVE IDs: CVE-2026-99999. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-99999?

CVE-2026-99999 has a CVSS v3 base score of 9.3, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-99999?

CVE-2026-99999 affects 1 product, including: azl3 kernel 6.6.157.1-1 on Azure Linux 3.0.

CVE-2026-99999CriticalCVSS 9.3

ipv4: validate checksum_start before completing checksum

Vendor

Microsoft Security Response Center (MSRC)

Published

October 16, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-99999 →

🎯 Affected products1

azl3 kernel 6.6.157.1-1 on Azure Linux 3.0

✅ Remediation

KBRelease Notes (Security Update) — fixed build 6.6.159.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99999
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade