What is CVE-2026-50257?

CVE-2026-50257 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

Which CVE IDs does CVE-2026-50257 cover?

CVE-2026-50257 covers the following CVE IDs: CVE-2026-50257. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-50257?

CVE-2026-50257 has a CVSS v3 base score of 6.6, published by Microsoft Security Response Center (MSRC).

Which products are affected by CVE-2026-50257?

CVE-2026-50257 affects 1 product, including: azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.0.

CVE-2026-50257MediumCVSS 6.6

Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free in misyncdestroyfence()

Vendor

Microsoft Security Response Center (MSRC)

Published

June 9, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-50257 →

🎯 Affected products1

azl3 xorg-x11-server-Xwayland 24.1.6-4 on Azure Linux 3.0

✅ Remediation

KBCBL-Mariner Releases (Security Update) — fixed build 24.1.12-1

🔗 References (2)

advisoryhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-50257
referencehttps://learn.microsoft.com/en-us/azure/azure-linux/tutorial-azure-linux-upgrade