What is CVE-2026-89551?

CVE-2026-89551 is a security advisory published by Microsoft Security Response Center (MSRC) with Critical severity. SUNRPC: xdr_buf_trim: clamp buf-\u003elen to avoid underflow

Which CVE IDs does CVE-2026-89551 cover?

CVE-2026-89551 covers the following CVE IDs: CVE-2026-89551. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-89551?

CVE-2026-89551 has a CVSS v3 base score of 9.8, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-89551?

CVE-2026-89551 affects 2 products, including: azl3 kernel 6.6.150.1-1 on Azure Linux 3.0; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0.

CVE-2026-89551CriticalCVSS 9.8

SUNRPC: xdr_buf_trim: clamp buf->len to avoid underflow

Vendor

Microsoft Security Response Center (MSRC)

Published

September 13, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-89551 →

🎯 Affected products2

azl3 kernel 6.6.150.1-1 on Azure Linux 3.0
azl3 kernel 6.6.152.1-1 on Azure Linux 3.0

✅ Remediation

Security Update KBRelease Notes (Security Update) — fixed build 6.6.157.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-89551
patchhttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade