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openSUSE Xwayland Important Heap Overflow Issue 2026-21283-1

opensuse
Calendar Grey July 13, 2026
Dist Opensuse Esm H88
Critical update for xwayland in openSUSE addressing two vulnerabilities with severity marked as important affecting system security.
An update that solves 2 vulnerabilities and has 2 bug fixes can now be installed.

Description

This update for xwayland 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).

Patch instructions:

To install this openSUSE security update use the suse recommended installation methods

like YaST online_update or "zypper patch".

Alternatively you can run the command listed for your product:

- openSUSE Leap 16.0

zypper in -t patch openSUSE-Leap-16.0-1194=1

Topics%20covered

Topics Covered

security advisory important heap overflow memory management OpenSUSE Xwayland

Patch

Package List

- openSUSE Leap 16.0:

xwayland-24.1.6-160000.6.1

xwayland-devel-24.1.6-160000.6.1

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

Severity
important
Lowest
Low
Medium
High
Critical

Announcement ID: openSUSE-SU-2026:21283-1
Rating: important
Affected Products: openSUSE Leap 16.0 -------------------------------------------------------------

Topics%20covered

Topics Covered

security advisory important heap overflow memory management OpenSUSE Xwayland

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