What is CVE-2026-23398?

CVE-2026-23398 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. icmp: fix NULL pointer dereference in icmp_tag_validation()

Which CVE IDs does CVE-2026-23398 cover?

CVE-2026-23398 covers the following CVE IDs: CVE-2026-23398. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-23398?

CVE-2026-23398 has a CVSS v3 base score of 6.5, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-23398?

CVE-2026-23398 affects 3 products, including: azl3 kernel 6.6.126.1-1 on Azure Linux 3.0; cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0.

CVE-2026-23398MediumCVSS 6.5

icmp: fix NULL pointer dereference in icmp_tag_validation()

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-23398 →

🎯 Affected products3

azl3 kernel 6.6.126.1-1 on Azure Linux 3.0
cbl2 kernel 5.15.202.1-1 on CBL Mariner 2.0
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0

✅ Remediation

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

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23398
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade