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CVE-2023-6816

Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer

Published: Jan 18, 2024Updated: Aug 29, 2025 Sources: CVE List NVD BDUCWE-787
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
2.1%
Top 20.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

A flaw was found in X.Org server. Both DeviceFocusEvent and the XIQueryPointer reply contain a bit for each logical button currently down. Buttons can be arbitrarily mapped to any value up to 255, but the X.Org Server was only allocating space for the device's particular number of buttons, leading to a heap overflow if a bigger value was used.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

CWE-787

Affected Products

x serverx.org
On-prem
Operating Systems / unix-bsd
xwaylandx.org
On-prem
Operating Systems / linux-distro
fedorafedoraproject
On-premOS
Operating Systems / linux-distro
enterprise linux desktopredhat
On-premOS
Operating Systems / linux-distro
enterprise linux serverredhat
On-premOS
Operating Systems / linux-distro
x.orgoss-projectUSOperating Systems
fedoraprojectoss-projectUSOperating Systemsaka fedora project
redhatcommercialUSOperating Systemsaka red hat
and 27 more affected products View all →

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available
Workaround Available

MITRE ATT&CK

2 techniques
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://access.redhat.com/errata/RHSA-2024:0320
access.redhat.com
https://access.redhat.com/errata/RHSA-2024:0557
access.redhat.com
https://access.redhat.com/errata/RHSA-2024:0558
access.redhat.com
and 31 more references View all →

Timeline

Published
Jan 18, 2024
Last Updated
Aug 29, 2025

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