CVE-2026-50258 is a high-severity stack buffer overflow (CVSS 7.8) in the X.Org X Server and XWayland, triggered by unchecked shift levels in xkb key types. Affected versions are x.org x_server prior to version 21.1.23 and x.org xwayland prior to version 24.1.12, including packages in Red Hat Enterprise Linux versions 7.0, 8.0, and 9.0. The vulnerability is resolved by upgrading to x.org x_server version 21.1.23 or x.org xwayland version 24.1.12.
We use optional cookies to improve your experience on our websites, such as through social media connections, and to display personalized advertising based on your online activity. If you reject optional cookies, only cookies necessary to provide you the services will be used. You may change your selection by clicking “Manage Cookies” at the bottom of the page. Privacy Statement Third-Party Cookies AcceptRejectManage cookies MSRC  Customer Guidance  Security Update Guide  Not found  Request failed with status code 404 404 ~ Not found The page you were looking for was either not found or not available! Your Privacy Choices Consumer Health Privacy