ALSA-2026:89747: Important: xorg-x11-server security update

Published Oct 26, 2026
·
Updated

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: Arbitrary code execution via use-after-free in passive grab handling (CVE-2026-93516) xorg-x11-server: xorg-x11-server: Privilege escalation via crafted RandR provider property requests (CVE-2026-93521) xorg-x11-server: xwayland: xorg-x11-server: Arbitrary code execution via double-free in XKB geometry handling (CVE-2026-88812) xorg-x11-server: xorg-x11-server: Out-of-bounds write via unvalidated modifier in ProcXIPassiveUngrabDevice (CVE-2026-93523) xorg-x11-server: xorg-x11-server: arbitrary code execution via GLX RenderLarge heap-based buffer overflow (CVE-2026-93517) xorg-x11-server: xorg-x11-server: arbitrary code execution via integer truncation during keyboard mapping resize (CVE-2026-93518) xorg-x11-server: xorg-x11-server: Arbitrary code execution via buffer overflow in inputconstraincursor() (CVE-2026-93519) xorg-x11-server: xorg-x11-server: arbitrary code execution via out-of-bounds write in XKB keycode handling (CVE-2026-93520)

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.

Affected Software

8 affected componentsFixes available
almalinux/xorg-x11-server-xdmx<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-xephyr<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-xnest<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-xorg<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-xvfb<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-common<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-devel<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5
almalinux/xorg-x11-server-source<1.20.11-28.el8_10.5
1.20.11-28.el8_10.5

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade almalinux/xorg-x11-server-Xdmx to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  2. Upgrade

    Upgrade almalinux/xorg-x11-server-Xephyr to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  3. Upgrade

    Upgrade almalinux/xorg-x11-server-Xnest to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  4. Upgrade

    Upgrade almalinux/xorg-x11-server-Xorg to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  5. Upgrade

    Upgrade almalinux/xorg-x11-server-Xvfb to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  6. Upgrade

    Upgrade almalinux/xorg-x11-server-common to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  7. Upgrade

    Upgrade almalinux/xorg-x11-server-devel to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5
  8. Upgrade

    Upgrade almalinux/xorg-x11-server-source to a version that resolves this vulnerability.

    Fixed in 1.20.11-28.el8_10.5

Event History

Oct 26, 2026
Advisory Published
via OSV·12:00 AM
Data Sourced
via OSV·12:00 AM
DescriptionAffected Software

Contact

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