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X.Org X Server EUVD-2026-27341

| CVE-2026-34000 MEDIUM
Out-of-bounds Read (CWE-125)
2026-05-05 redhat GHSA-x7p4-8jjf-qcp4
Denial Of Service Information Disclosure Buffer Overflow Red Hat Enterprise Linux 10 Red Hat Enterprise Linux 6 Red Hat Enterprise Linux 7 Red Hat Enterprise Linux 8 Red Hat Enterprise Linux 9
6.1
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.1 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:L
SUSE
MEDIUM
qualitative
Red Hat
6.1 MEDIUM
qualitative

Primary rating from NVD.

CVSS VectorNVD

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

Lifecycle Timeline

1
Analysis Generated
May 05, 2026 - 16:31 vuln.today

DescriptionCVE.org

A flaw was found in the X.Org X server. This out-of-bounds read vulnerability in the XKB geometry processing, specifically within the CheckSetGeom() and XkbAddGeomKeyAlias functions, allows an attacker to read uninitialized or out-of-bounds memory. An attacker with a connection to the X11 server, either locally or remotely, can exploit this without user interaction. This could lead to the disclosure of memory contents or cause a denial of service by crashing the server.

AnalysisAI

Out-of-bounds read in X.Org X server XKB geometry processing allows local or remote attackers with X11 server access to disclose sensitive memory contents or cause denial of service by crashing the server. The vulnerability exists in CheckSetGeom() and XkbAddGeomKeyAlias functions and requires low privileges but no user interaction. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Establish X11 connection
Delivery
Craft malicious XKB geometry request
Exploit
Send geometry data to server
Execution
Trigger out-of-bounds read in geometry parser
Impact
Read sensitive memory contents or crash server
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Vulnerability AssessmentAI

Exploitation Exploitation requires a valid connection to the X.Org X server as an authenticated user with at least low privileges (PR:L in CVSS). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment This vulnerability presents moderate real-world risk with conflicting signals. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker with local access to a system running X.Org X server, or remote access if X11 is configured to listen on network interfaces, establishes a connection to the X11 server as a low-privilege user. The attacker sends a crafted XKB geometry request containing specially crafted KeyAlias or geometry data that triggers an out-of-bounds read in CheckSetGeom() or XkbAddGeomKeyAlias. …
Remediation Apply the vendor-released patch provided by Red Hat for your respective RHEL version via the standard package update mechanism (yum update xorg-x11-server or equivalent). … Detailed patch versions, workarounds, and compensating controls in full report.
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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
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Image SLES15-SP5-SAPCAL-Azure Image SLES15-SP5-SAPCAL-EC2 Image SLES15-SP5-SAPCAL-GCE Affected
Image SLES15-SP6-SAP Image SLES15-SP6-SAP-Azure Image SLES15-SP6-SAP-EC2 Image SLES15-SP6-SAP-GCE Image SLES15-SP6-SAPCAL Image SLES15-SP6-SAPCAL-Azure Image SLES15-SP6-SAPCAL-EC2 Image SLES15-SP6-SAPCAL-GCE Affected
Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected

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EUVD-2026-27341 vulnerability details – vuln.today
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