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X.Org Server EUVDEUVD-2026-25231

| CVE-2026-34003 HIGH
Out-of-bounds Read (CWE-125)
2026-04-23 redhat GHSA-5mqr-3465-c7p6
7.8
CVSS 3.1 · Vendor: redhat
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Severity by source

Vendor (redhat) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.3 HIGH

Local authenticated client (AV:L/PR:L); OOB read gives strong info disclosure (C:H) and crash (A:H), but integrity impact is only conditional, so I:L rather than I:H.

3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
4.0 AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:L/VA:H/SC:N/SI:N/SA:N
SUSE
HIGH
qualitative
Red Hat
7.8 HIGH
qualitative

Primary rating from Vendor (redhat).

CVSS VectorVendor: redhat

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

Lifecycle Timeline

4
Analysis Generated
Jul 24, 2026 - 04:45 vuln.today
Patch released
Apr 28, 2026 - 20:30 nvd
Patch available
EUVD ID Assigned
Apr 23, 2026 - 16:00 euvd
EUVD-2026-25231
CVE Published
Apr 23, 2026 - 14:54 nvd
HIGH 7.8

DescriptionCVE.org

A flaw was found in the X.Org X server's XKB key types request validation. A local attacker could send a specially crafted request to the X server, leading to an out-of-bounds memory access vulnerability. This could result in the disclosure of sensitive information or cause the server to crash, leading to a Denial of Service (DoS). In certain configurations, higher impact outcomes may be possible.

AnalysisAI

Out-of-bounds memory read in the X.Org X server's XKB key types request handling allows a local, authenticated client to disclose adjacent server memory or crash the server (DoS), with higher-impact outcomes possible in certain configurations. The flaw affects the X server component shipped across Red Hat Enterprise Linux 6 through 10 and corresponding SUSE releases, and stems from missing bounds validation on an XKB request. There is no public exploit identified at time of analysis, EPSS is negligible (0.01%), and CISA/SSVC records no known exploitation.

Technical ContextAI

The X.Org Server is the reference implementation of the X11 display server protocol and is the graphical backbone of most Linux desktops and workstations. The XKB (X Keyboard) extension processes keyboard-layout requests from connected clients, including the definition and lookup of 'key types.' This vulnerability is a CWE-125 out-of-bounds read: the server fails to fully validate length or index fields in an XKB key-types request before accessing the backing buffer, so a crafted request drives a read past the allocated region. Because the X server historically runs with elevated privileges and shares an address space with sensitive session state, an OOB read there can leak memory contents or corrupt server state, and the description's note about 'certain configurations' reflects that setups running the server as root or with additional privileges could escalate the impact.

RemediationAI

Apply your distribution's patched X.Org server packages: on Red Hat systems update per Vendor-released patch advisories RHSA-2026:10739, RHSA-2026:11352, and RHSA-2026:11369 (https://access.redhat.com/security/cve/CVE-2026-34003), and on SUSE systems apply the corresponding SUSE-SU-2026:1328-1335 / 21211 updates (e.g. https://www.suse.com/support/update/SUSE-SU-2026:1328/), then restart the display server or reboot so the running server picks up the fix. Because exploitation requires a local client connection, effective compensating controls where patching must be delayed are: restrict local/interactive login to trusted users, avoid shared multi-user X sessions, and prefer running the graphical stack under a non-root/rootless model (e.g. rootless Xorg or migrating affected hosts to Wayland where feasible) to shrink the privilege blast radius - noting the trade-off that Wayland migration can break X11-only applications and rootless mode may not be supported on all legacy RHEL 6/7 systems.

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Vendor StatusVendor

SUSE

Severity: High
Product Status
Image SLES15-SP4-SAP Image SLES15-SP4-SAP-Azure Image SLES15-SP4-SAP-EC2 Image SLES15-SP4-SAP-GCE Image SLES15-SP4-SAPCAL Image SLES15-SP4-SAPCAL-Azure Image SLES15-SP4-SAPCAL-EC2 Image SLES15-SP4-SAPCAL-GCE Affected
Image SLES15-SP5-SAPCAL-Azure Image SLES15-SP5-SAPCAL-GCE Affected
Image SLES15-SP6-SAP Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-EC2 Affected
SUSE Liberty Linux 9 Fixed
SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP7 Fixed

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EUVD-2026-25231 vulnerability details – vuln.today

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