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CVE-2023-6816

Severity
CRITICAL
CVSS
9.8
EPSS
0.02106
Risk score
39.94
CISA KEV
No
PoC
No
Published
2024-01-18
Modified
2026-03-19
First seen
2026-08-07
Aliases
EUVD-2023-59026, GHSA-PCJV-393Q-RQF2
Products
Red Hat:Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION patch: 0:1.1.0-25.el6_10.13, Red Hat:Red Hat Enterprise Linux 7 patch: 0:1.20.4-27.el7_9, Red Hat:Red Hat Enterprise Linux 7 patch: 0:1.8.0-31.el7_9, Red Hat:Red Hat Enterprise Linux 8 patch: 0:1.13.1-2.el8_9.7, Red Hat:Red Hat Enterprise Linux 8 patch: 0:1.20.11-22.el8, Red Hat:Red Hat Enterprise Linux 8 patch: 0:21.1.3-15.el8, Red Hat:Red Hat Enterprise Linux 8.2 Advanced Update Support patch: 0:1.9.0-15.el8_2.9, Red Hat:Red Hat Enterprise Linux 8.2 Telecommunications Update Service patch: 0:1.9.0-15.el8_2.9, Red Hat:Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions patch: 0:1.9.0-15.el8_2.9, Red Hat:Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support patch: 0:1.11.0-8.el8_4.8, Red Hat:Red Hat Enterprise Linux 8.4 Telecommunications Update Service patch: 0:1.11.0-8.el8_4.8, Red Hat:Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions patch: 0:1.11.0-8.el8_4.8, Red Hat:Red Hat Enterprise Linux 8.6 Extended Update Support patch: 0:1.12.0-6.el8_6.9, Red Hat:Red Hat Enterprise Linux 8.8 Extended Update Support patch: 0:1.12.0-15.el8_8.7, Red Hat:Red Hat Enterprise Linux 9 patch: 0:1.13.1-3.el9_3.6, Red Hat:Red Hat Enterprise Linux 9 patch: 0:1.20.11-24.el9, Red Hat:Red Hat Enterprise Linux 9 patch: 0:22.1.9-5.el9, Red Hat:Red Hat Enterprise Linux 9.0 Extended Update Support patch: 0:1.11.0-22.el9_0.8, Red Hat:Red Hat Enterprise Linux 9.2 Extended Update Support patch: 0:1.12.0-14.el9_2.5
Sources
euvd EUVD-2023-59026

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.

References