What is CVE-2026-23231?

CVE-2026-23231 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

Which CVE IDs does CVE-2026-23231 cover?

CVE-2026-23231 covers the following CVE IDs: CVE-2026-23231. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-23231?

CVE-2026-23231 has a CVSS v3 base score of 7.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-23231?

CVE-2026-23231 affects 4 products, including: azl3 kernel 6.6.126.1-1 on Azure Linux 3.0; cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0; 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-2026-23231HighCVSS 7.8

netfilter: nf_tables: fix use-after-free in nf_tables_addchain()

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-23231 →

🎯 Affected products4

azl3 kernel 6.6.126.1-1 on Azure Linux 3.0
cbl2 kernel 5.15.200.1-1 on CBL Mariner 2.0
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 KBRelease Notes (Security Update)

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-23231
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade