SUSE xorg-x11-server Important Buffer Overflow Vulnern 2026-2792

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SUSE xorg-x11-server Important Buffer Overflow Vulnern 2026-2792

Linuxsecurity •LinuxSecurity Advisories • July 8, 2026

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## This update for xorg-x11-server fixes the following issue * 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). ## 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 12 SP5 LTSS Extended Security zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-2792=1 * SUSE Linux Enterprise Server 12 SP5 LTSS zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-2792=1 ## Package List: * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64) * xorg-x11-server-extra-1.19.6-10.105.1

## This update for xorg-x11-server fixes the following issue * 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). ## 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 12 SP5 LTSS Extended Security zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-2792=1 * SUSE Linux Enterprise Server 12 SP5 LTSS zypper in -t patch SUSE-SLE-SERVER-12-SP5-LTSS-2026-2792=1 ## Package List: * SUSE Linux Enterprise Server 12 SP5 LTSS (aarch64 ppc64le s390x x86_64) * xorg-x11-server-extra-1.19.6-10.105.1

* CVE-2026-55999 ( SUSE ): 7.3

CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

* CVE-2026-55999 ( SUSE ): 7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

* CVE-2026-55999 ( NVD ): 8.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

* SUSE Linux Enterprise High Performance Computing 12 SP5

* SUSE Linux Enterprise Server 12 SP5

* SUSE Linux Enterprise Server 12 SP5 LTSS

* SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security

* SUSE Linux Enterprise Server for SAP Applications 12 SP5

An update that solves one vulnerability can now be installed.

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Announcement ID: SUSE-SU-2026:2792-1 Release Date: 2026-07-08T07:55:40Z Rating: important

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The full story

This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Vulnerabilities in xorg-server Affecting Slackware and SUSE Systems Recent updates have addressed critical vulnerabilities in xorg-server affecting Slackware and SUSE systems. The vulnerabilities include CVE-2026-55999, a heap buffer overflow due to a missing bounds check in `glamor_font_get`, and CVE-2026-56000, a use-after-free issue in `CommonMakeCurrent`. These vulnerabilities can be exploited by processing malicious PCF files or through interactions with malicious clients creating GLX contexts. The flaws were confirmed and patched on July 8, 2026, with significant implications for users of Slackware 15.0 and SUSE Linux Enterprise Server. Users are advised to apply the patches immediately to mitigate potential exploitation risks. The vulnerabilities are rated as important, indicating a serious risk to system integrity and security. 5 sources 72

Extracted Entities

Attack Types (1)

Zero-day Exploit

CVEs (1)

CWE Weaknesses (1)

CWE-122 - Heap-based Buffer Overflow

Platforms (2)

SUSE Linux Enterprise Server 12 SP5 LTSS SUSE Linux Enterprise Server 12 SP5 LTSS Extended Security