AlmaLinux alert ALSA-2026:19343 (xorg-x11-server)

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[Announce] [Security Advisory] ALSA-2026:19343: xorg-x11-server security update (Important)
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Tue, 26 May 2026 16:56:00 +0000
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<0100019e6536f3bd-2c1b2e4b-528f-46e3-8538-2a2ce8fba6f9-000000@email.amazonses.com>
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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: 2026-05-26

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: xwayland: X.Org X server: Denial of Service via integer underflow in XKB compatibility
map handling (CVE-2026-33999)
  * xorg: xwayland: X.Org X server: Use-after-free vulnerability leads to server crash and
potential memory corruption (CVE-2026-34001)
  * xorg: xwayland: X.Org X server: Information exposure and denial of service via out-of-bounds
memory access (CVE-2026-34003)


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-2026-19343.html

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AlmaLinux Team
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