What is CVE-2026-31638?

CVE-2026-31638 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. rxrpc: Only put the call ref if one was acquired

Which CVE IDs does CVE-2026-31638 cover?

CVE-2026-31638 covers the following CVE IDs: CVE-2026-31638. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-31638?

CVE-2026-31638 has a CVSS v3 base score of 7.0, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-31638?

CVE-2026-31638 affects 2 products, including: azl3 kernel 6.6.130.1-3 on Azure Linux 3.0; azl3 kernel 6.6.134.1-2 on Azure Linux 3.0.

CVE-2026-31638MediumCVSS 7.0

rxrpc: Only put the call ref if one was acquired

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2026-31638 →

🎯 Affected products2

azl3 kernel 6.6.130.1-3 on Azure Linux 3.0
azl3 kernel 6.6.134.1-2 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 6.6.137.1-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31638
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade