Bug 2485388 (CVE-2026-50263) - CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()
Summary: CVE-2026-50263 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: us...
Keywords:
Status: NEW
Alias: CVE-2026-50263
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-05 08:12 UTC by OSIDB Bzimport
Modified: 2026-07-27 09:39 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2026:26562 0 None None None 2026-06-17 12:06:43 UTC
Red Hat Product Errata RHSA-2026:26566 0 None None None 2026-06-22 02:25:20 UTC
Red Hat Product Errata RHSA-2026:26590 0 None None None 2026-06-17 14:49:37 UTC
Red Hat Product Errata RHSA-2026:26610 0 None None None 2026-06-17 15:41:15 UTC
Red Hat Product Errata RHSA-2026:26709 0 None None None 2026-06-17 17:49:15 UTC
Red Hat Product Errata RHSA-2026:28923 0 None None None 2026-06-24 10:22:53 UTC
Red Hat Product Errata RHSA-2026:29844 0 None None None 2026-06-25 12:55:48 UTC
Red Hat Product Errata RHSA-2026:36083 0 None None None 2026-07-07 05:59:19 UTC
Red Hat Product Errata RHSA-2026:36085 0 None None None 2026-07-07 06:33:55 UTC
Red Hat Product Errata RHSA-2026:36086 0 None None None 2026-07-07 06:09:13 UTC
Red Hat Product Errata RHSA-2026:36087 0 None None None 2026-07-07 06:19:06 UTC
Red Hat Product Errata RHSA-2026:36632 0 None None None 2026-07-08 09:22:51 UTC
Red Hat Product Errata RHSA-2026:36633 0 None None None 2026-07-08 09:12:03 UTC
Red Hat Product Errata RHSA-2026:36634 0 None None None 2026-07-08 09:33:48 UTC
Red Hat Product Errata RHSA-2026:36768 0 None None None 2026-07-08 14:32:52 UTC
Red Hat Product Errata RHSA-2026:36791 0 None None None 2026-07-08 16:11:40 UTC
Red Hat Product Errata RHSA-2026:36792 0 None None None 2026-07-08 16:19:47 UTC
Red Hat Product Errata RHSA-2026:36798 0 None None None 2026-07-08 16:21:59 UTC
Red Hat Product Errata RHSA-2026:38502 0 None None None 2026-07-13 03:22:59 UTC
Red Hat Product Errata RHSA-2026:38810 0 None None None 2026-07-13 09:28:29 UTC
Red Hat Product Errata RHSA-2026:46377 0 None None None 2026-07-27 02:22:00 UTC
Red Hat Product Errata RHSA-2026:46382 0 None None None 2026-07-27 03:19:32 UTC
Red Hat Product Errata RHSA-2026:46385 0 None None None 2026-07-27 03:28:08 UTC
Red Hat Product Errata RHSA-2026:46392 0 None None None 2026-07-27 03:32:12 UTC
Red Hat Product Errata RHSA-2026:46456 0 None None None 2026-07-27 06:05:10 UTC
Red Hat Product Errata RHSA-2026:46460 0 None None None 2026-07-27 06:19:16 UTC
Red Hat Product Errata RHSA-2026:46473 0 None None None 2026-07-27 09:39:15 UTC

Description OSIDB Bzimport 2026-06-05 08:12:14 UTC 
A client can trigger a use-after-free read after changing window attributes and forcing the screen saver in CreateSaverWindow(), leading to information disclosure.

Any X client that can connect to the server can trigger this issue.

Components affected: xorg-x11-server, xorg-x11-server-Xwayland
Versions affected: xorg-x11-server <= 21.1.22, xorg-x11-server-Xwayland <= 24.1.9

Fixed upstream in xorg-server-21.1.23 and xwayland-24.1.12.
Fix: https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05

Reported via ZDI-CAN-30168 (Trend Micro Zero Day Initiative). Tracking: PSIRTSUPT-16950.
Comment 2 errata-xmlrpc 2026-06-17 12:06:42 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:26562 https://access.redhat.com/errata/RHSA-2026:26562
Comment 3 errata-xmlrpc 2026-06-17 14:49:36 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:26590 https://access.redhat.com/errata/RHSA-2026:26590
Comment 4 errata-xmlrpc 2026-06-17 15:41:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:26610 https://access.redhat.com/errata/RHSA-2026:26610
Comment 5 errata-xmlrpc 2026-06-17 17:49:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:26709 https://access.redhat.com/errata/RHSA-2026:26709
Comment 6 errata-xmlrpc 2026-06-22 02:25:19 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10

Via RHSA-2026:26566 https://access.redhat.com/errata/RHSA-2026:26566
Comment 7 errata-xmlrpc 2026-06-24 10:22:52 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2026:28923 https://access.redhat.com/errata/RHSA-2026:28923
Comment 8 errata-xmlrpc 2026-06-25 12:55:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2026:29844 https://access.redhat.com/errata/RHSA-2026:29844
Comment 9 errata-xmlrpc 2026-07-07 05:59:18 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:36083 https://access.redhat.com/errata/RHSA-2026:36083
Comment 10 errata-xmlrpc 2026-07-07 06:09:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:36086 https://access.redhat.com/errata/RHSA-2026:36086
Comment 11 errata-xmlrpc 2026-07-07 06:19:05 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:36087 https://access.redhat.com/errata/RHSA-2026:36087
Comment 12 errata-xmlrpc 2026-07-07 06:33:54 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:36085 https://access.redhat.com/errata/RHSA-2026:36085
Comment 13 errata-xmlrpc 2026-07-08 09:12:02 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:36633 https://access.redhat.com/errata/RHSA-2026:36633
Comment 14 errata-xmlrpc 2026-07-08 09:22:50 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:36632 https://access.redhat.com/errata/RHSA-2026:36632
Comment 15 errata-xmlrpc 2026-07-08 09:33:47 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:36634 https://access.redhat.com/errata/RHSA-2026:36634
Comment 16 errata-xmlrpc 2026-07-08 14:32:51 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:36768 https://access.redhat.com/errata/RHSA-2026:36768
Comment 17 errata-xmlrpc 2026-07-08 16:11:39 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:36791 https://access.redhat.com/errata/RHSA-2026:36791
Comment 18 errata-xmlrpc 2026-07-08 16:19:45 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:36792 https://access.redhat.com/errata/RHSA-2026:36792
Comment 19 errata-xmlrpc 2026-07-08 16:21:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 10.0 Extended Update Support

Via RHSA-2026:36798 https://access.redhat.com/errata/RHSA-2026:36798
Comment 20 errata-xmlrpc 2026-07-13 03:22:58 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:38502 https://access.redhat.com/errata/RHSA-2026:38502
Comment 21 errata-xmlrpc 2026-07-13 09:28:28 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:38810 https://access.redhat.com/errata/RHSA-2026:38810
Comment 22 errata-xmlrpc 2026-07-27 02:21:59 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions

Via RHSA-2026:46377 https://access.redhat.com/errata/RHSA-2026:46377
Comment 23 errata-xmlrpc 2026-07-27 03:19:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On

Via RHSA-2026:46382 https://access.redhat.com/errata/RHSA-2026:46382
Comment 24 errata-xmlrpc 2026-07-27 03:28:07 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions
  Red Hat Enterprise Linux 8.8 Telecommunications Update Service

Via RHSA-2026:46385 https://access.redhat.com/errata/RHSA-2026:46385
Comment 25 errata-xmlrpc 2026-07-27 03:32:12 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.6 Extended Update Support

Via RHSA-2026:46392 https://access.redhat.com/errata/RHSA-2026:46392
Comment 26 errata-xmlrpc 2026-07-27 06:05:09 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions

Via RHSA-2026:46456 https://access.redhat.com/errata/RHSA-2026:46456
Comment 27 errata-xmlrpc 2026-07-27 06:19:15 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
  Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

Via RHSA-2026:46460 https://access.redhat.com/errata/RHSA-2026:46460
Comment 28 errata-xmlrpc 2026-07-27 09:39:14 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7 Extended Lifecycle Support

Via RHSA-2026:46473 https://access.redhat.com/errata/RHSA-2026:46473
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