AlmaLinux alert ALSA-2026:26610 (xorg-x11-server)

From:
             
 
AlmaLinux Errata Notifications via Announce <announce@lists.almalinux.org>
To:
             
 
announce@lists.almalinux.org
Subject:
             
 
[Announce] [Security Advisory] ALSA-2026:26610: xorg-x11-server security, bug fix, and enhancement update (Important)
Date:
             
 
Thu, 02 Jul 2026 14:12:33 +0000
Message-ID:
             
 
<0100019f232c9b52-2e60f99c-f257-4aee-8d0f-b2840c2be60d-000000@email.amazonses.com>
Archive-link:
             
 
Article
Hi,

You are receiving an AlmaLinux Security update email because you subscribed to receive errata
notifications from AlmaLinux.

AlmaLinux: 9
Type: Security
Severity: Important
Release date: 2026-07-02

Summary:

X.Org is an open-source implementation of the X Window System. It provides the basic low-level
functionality that full-fledged graphical user interfaces are designed upon.  

Security Fix(es):  

  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias
resolution due to libXfont2 name length mismatch (CVE-2026-50256)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in
miSyncDestroyFence() (CVE-2026-50257)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key
types due to unchecked shift levels (CVE-2026-50258)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap
request via mapWidths indexing (CVE-2026-50259)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()
(CVE-2026-50260)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in
SyncChangeCounter() (CVE-2026-50261)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX
ChangeDrawableAttributes (CVE-2026-50262)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information
disclosure in CreateSaverWindow() (CVE-2026-50263)
  * xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2
DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)


Bug Fix(es) and Enhancement(s):  

  * [xserver] Backport other security fixes without a CVE assigned [almalinux-9.8.z]
(JIRA:AlmaLinux-184288)


For more details about the security issue(s), including the impact, a CVSS score, acknowledgments,
and other related information, refer to the CVE page(s) listed in the References section.


Full details, updated packages, references, and other related information:
https://errata.almalinux.org/9/ALSA-2026-26610.html

This message is automatically generated, please don’t reply. For further questions, please, contact
us via the AlmaLinux community chat: https://chat.almalinux.org/.
Want to change your notification settings? Sign in and manage mailing lists on
https://lists.almalinux.org.

Kind regards,
AlmaLinux Team
_______________________________________________
Announce mailing list -- announce@lists.almalinux.org
To unsubscribe send an email to announce-leave@lists.almalinux.org