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

9.8 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

THREAT MONITOR

Am I Vulnerable?

Launch our assessment wizard to check if your infrastructure is exposed to • CVE-2023-6816

Check My Exposure

Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Red Hat would like to thank Jan-Niklas Sohn (Trend Micro Zero Day Initiative) for reporting this issue.

References

More from Red Hat

View All →

CVE-2025-9909

Aap-gateway: improper path validation in gateway allows credential exfiltration

Medium 6.7

CVE-2025-9908

Event-driven-ansible: sensitive internal headers disclosure in aap eda event streams

Medium 6.7

CVE-2025-9907

Event-driven-ansible: event stream test mode exposes sensitive headers in aap eda

Medium 6.7

CVE-2025-9901

Libsoup: improper handling of http vary header in libsoup caching

Medium 5.9

CVE-2025-9820

Gnutls: stack-based buffer overflow in gnutls_pkcs11_token_init() function

Medium 4

Affected Vendor

Red Hat

View all reports →

Affected Software

Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8.2 Advanced Update Support, Red Hat Enterprise Linux 8.2 Telecommunications Update Service, Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4 Telecommunications Update Service, Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 8.6 Extended Update Support, Red Hat Enterprise Linux 8.8 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.0 Extended Update Support, Red Hat Enterprise Linux 9.2 Extended Update Support, Red Hat Enterprise Linux 6

Vulnerable Versions:

0:1.1.0-25.el6_10.13, 0:1.20.4-27.el7_9, 0:1.8.0-31.el7_9, 0:1.13.1-2.el8_9.7, 0:1.20.11-22.el8, 0:21.1.3-15.el8, 0:1.9.0-15.el8_2.9, 0:1.11.0-8.el8_4.8, 0:1.12.0-6.el8_6.9, 0:1.12.0-15.el8_8.7, 0:1.13.1-3.el9_3.6, 0:1.20.11-24.el9, 0:22.1.9-5.el9, 0:1.11.0-22.el9_0.8, 0:1.12.0-14.el9_2.5