CVE-2023-6816

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

CRITICAL 9.8

At a glance

Source: NVD
EPSS: EPSS 2.11 % · percentile 82 (2026-10-28)
State: PUBLISHED
Published: 2024-01-18 04:31 UTC
Updated: 2026-03-19 21:23 UTC
Assigner: redhat
NVD status: Modified

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.

Weaknesses (CWE)

CWE-787 — Out-of-bounds Write

References

Scores

Version	Score	Vector	Scored by
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	redhat
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · secalert@redhat.com (Secondary)
CVSS 3.1	CRITICAL 9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · nvd@nist.gov (Primary)

European references

ENISA EUVD · EUVD-2023-59026
GCVE · GCVE-0-2023-6816

Affected configurations (NVD CPE)

cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* < 21.1.11
cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* < 23.2.4
cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*

Affected products

Product	Versions
Red Hat · Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION	unaffected 0:1.1.0-25.el6_10.13 < *
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:1.20.4-27.el7_9 < *
Red Hat · Red Hat Enterprise Linux 7	unaffected 0:1.8.0-31.el7_9 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:1.13.1-2.el8_9.7 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:1.20.11-22.el8 < *
Red Hat · Red Hat Enterprise Linux 8	unaffected 0:21.1.3-15.el8 < *
Red Hat · Red Hat Enterprise Linux 8.2 Advanced Update Support	unaffected 0:1.9.0-15.el8_2.9 < *
Red Hat · Red Hat Enterprise Linux 8.2 Telecommunications Update Service	unaffected 0:1.9.0-15.el8_2.9 < *
Red Hat · Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions	unaffected 0:1.9.0-15.el8_2.9 < *
Red Hat · Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	unaffected 0:1.11.0-8.el8_4.8 < *
Red Hat · Red Hat Enterprise Linux 8.4 Telecommunications Update Service	unaffected 0:1.11.0-8.el8_4.8 < *
Red Hat · Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions	unaffected 0:1.11.0-8.el8_4.8 < *
Red Hat · Red Hat Enterprise Linux 8.6 Extended Update Support	unaffected 0:1.12.0-6.el8_6.9 < *
Red Hat · Red Hat Enterprise Linux 8.8 Extended Update Support	unaffected 0:1.12.0-15.el8_8.7 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:1.13.1-3.el9_3.6 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:1.20.11-24.el9 < *
Red Hat · Red Hat Enterprise Linux 9	unaffected 0:22.1.9-5.el9 < *
Red Hat · Red Hat Enterprise Linux 9.0 Extended Update Support	unaffected 0:1.11.0-22.el9_0.8 < *
Red Hat · Red Hat Enterprise Linux 9.2 Extended Update Support	unaffected 0:1.12.0-14.el9_2.5 < *
Red Hat · Red Hat Enterprise Linux 6

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD