CVE-2026-50263
Xorg-x11-server: xorg-x11-server-xwayland: xorg-x11-server: use-after-free information disclosure in createsaverwindow()
CVSS Score
5.5
EPSS Score
0.1%
EPSS Percentile
4th
A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.
| CWE | CWE-416 |
| Vendor | red hat |
| Product | red hat enterprise linux 10 |
| Published | Jun 5, 2026 |
| Last Updated | Jul 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None
Affected Versions
Red Hat / Red Hat Enterprise Linux 10
All versions affected Red Hat / Red Hat Enterprise Linux 10.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 7 Extended Lifecycle Support
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 9.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26562 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26566 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26590 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26610 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:26709 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:28923 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:29844 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36083 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36085 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36086 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36087 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36632 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36633 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36634 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36768 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36791 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36792 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:36798 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:38502 access.redhat.com: https://access.redhat.com/errata/RHSA-2026:38810 access.redhat.com: https://access.redhat.com/security/cve/CVE-2026-50263 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2485388 gitlab.freedesktop.org: https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05 lists.x.org: https://lists.x.org/archives/xorg-announce/2026-June/003702.html redhat.atlassian.net: https://redhat.atlassian.net/browse/PSIRTSUPT-16950
Credits
Upstream acknowledges Anonymous (Trend Micro Zero Day Initiative) as the original reporter.