Bug 2485387 (CVE-2026-50262) - CVE-2026-50262 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes
Summary: CVE-2026-50262 xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: ou...
Keywords:
Status: NEW
Alias: CVE-2026-50262
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: 2026-07-07 06:33 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 15:41:14 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 10:22:52 UTC
Red Hat Product Errata RHSA-2026:29844 0 None None None 2026-06-25 12:55:47 UTC
Red Hat Product Errata RHSA-2026:36083 0 None None None 2026-07-07 05:59:18 UTC
Red Hat Product Errata RHSA-2026:36085 0 None None None 2026-07-07 06:33:52 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 06:19:07 UTC

Description OSIDB Bzimport 2026-06-05 08:12:12 UTC 
A wrong size validation check in __glXDisp_ChangeDrawableAttributes() can read (or write) a client-controlled number of bytes, exceeding the request buffer. The write path requires byte-swapped clients which is disabled by default. The read can lead to information disclosure; the write can crash the server or enable privilege escalation if the X server runs as root.

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/6d459e4daf715bea8abdafa8fb130be2f8a1d145

Reported via ZDI-CAN-30165 (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 15:41:13 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 17:49:15 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 10:22:51 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 12:55:46 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 05:59:17 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 06:19:06 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 06:33:51 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
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