What is CVE-2025-31133?

CVE-2025-31133 is a security advisory published by Microsoft Security Response Center (MSRC) with High severity. runc container escape via "masked path" abuse due to mount race conditions

Which CVE IDs does CVE-2025-31133 cover?

CVE-2025-31133 covers the following CVE IDs: CVE-2025-31133. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by CVE-2025-31133?

CVE-2025-31133 affects 3 products, including: azl3 kubernetes 1.30.10-14 on Azure Linux 3.0; cbl2 kubernetes 1.28.4-19 on CBL Mariner 2.0; cbl2 moby-runc 1.1.9-9 on CBL Mariner 2.0.

CVE-2025-31133High

runc container escape via "masked path" abuse due to mount race conditions

Vendor

Microsoft Security Response Center (MSRC)

Published

May 31, 2026

Last Modified

—

🔗 CVE IDs covered (1)

CVE-2025-31133 →

🎯 Affected products3

azl3 kubernetes 1.30.10-14 on Azure Linux 3.0
cbl2 kubernetes 1.28.4-19 on CBL Mariner 2.0
cbl2 moby-runc 1.1.9-9 on CBL Mariner 2.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 1.2.8-1 KBCBL-Mariner Releases (Security Update) — fixed build 1.28.4-20 KBCBL-Mariner Releases (Security Update) — fixed build 1.30.10-15

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-31133
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade