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openSUSE xorg-x11-server Important Buffer Overflow Heap Issues 2026-2786-1

opensuse
Calendar Grey July 8, 2026
Dist Opensuse Esm H88
An important security update for openSUSE that addresses critical issues in xorg-x11-server to prevent heap overflows.
An update that solves two vulnerabilities can now be installed.

Description

This update for xorg-x11-server fixes the following issues

* CVE-2026-55999: missing bounds check in `glamor_font_get` can lead to a heap

buffer overflow when a font loaded from a malicious PCF file is processed

(bsc#1268893).

* CVE-2026-56000: improper memory management in `CommonMakeCurrent` can lead

to a heap use-after-free when an interaction with a malicious client

creating GLX contexts happens (bsc#1268894).

Topics%20covered

Topics Covered

security advisory important heap overflow memory management OpenSUSE CVE-2026-55999

Patch

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like

YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

* SUSE Linux Enterprise Server for SAP Applications 15 SP6

zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-2786=1

* openSUSE Leap 15.6

zypper in -t patch SUSE-2026-2786=1

* SUSE Linux Enterprise Server 15 SP6 LTSS

zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-2786=1

Package List

* SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)

* xorg-x11-server-sdk-21.1.11-150600.5.31.1

* xorg-x11-server-extra-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-extra-21.1.11-150600.5.31.1

* xorg-x11-server-Xvfb-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-debugsource-21.1.11-150600.5.31.1

* xorg-x11-server-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-21.1.11-150600.5.31.1

* xorg-x11-server-Xvfb-21.1.11-150600.5.31.1

* openSUSE Leap 15.6 (aarch64 i586 ppc64le s390x x86_64)

* xorg-x11-server-sdk-21.1.11-150600.5.31.1

* xorg-x11-server-extra-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-extra-21.1.11-150600.5.31.1

* xorg-x11-server-Xvfb-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-debugsource-21.1.11-150600.5.31.1

* xorg-x11-server-debuginfo-21.1.11-150600.5.31.1

* xorg-x11-server-21.1.11-150600.5.31.1

* xorg-x11-server-source-21.1.11-150600.5.31.1

* xorg-x11-server-Xvfb-21.1.11-150600.5.31.1

* SUSE Linux Enterprise Server for SAP Applications 15 SP6...

Read the Full Advisory

References

* bsc#1268893

* bsc#1268894

## References:

* https://www.suse.com/security/cve/CVE-2026-55999.html

* https://www.suse.com/security/cve/CVE-2026-56000.html

* https://bugzilla.suse.com/show_bug.cgi?id=1268893

* https://bugzilla.suse.com/show_bug.cgi?id=1268894

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: SUSE-SU-2026:2786-1
Release Date: 2026-07-08T07:16:51Z
Affected Products: * openSUSE Leap 15.6 * SUSE Linux Enterprise Server 15 SP6 * SUSE Linux Enterprise Server 15 SP6 LTSS * SUSE Linux Enterprise Server for SAP Applications 15 SP6

Topics%20covered

Topics Covered

security advisory important heap overflow memory management OpenSUSE CVE-2026-55999

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