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

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Summary

CVECVE-2023-6816
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2024-01-18 05:15:08 UTC
Updated2026-11-04 21:17:28 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.021060000 probability, percentile 0.818070000 (date 2026-11-04)

Problem Types: CWE-787 | CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Fedoraproject Fedora 39 All All All
Operating System Redhat Enterprise Linux Desktop 7.0 All All All
Operating System Redhat Enterprise Linux Server 7.0 All All All
Operating System Redhat Enterprise Linux Workstation 7.0 All All All
Application X.org Xwayland All All All All
Application X.org X Server All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION unaffected 0:1.1.0-25.el6_10.13 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 unaffected 0:1.20.4-27.el7_9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 7 unaffected 0:1.8.0-31.el7_9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.13.1-2.el8_9.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:1.20.11-22.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:21.1.3-15.el8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Advanced Update Support unaffected 0:1.9.0-15.el8_2.9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Telecommunications Update Service unaffected 0:1.9.0-15.el8_2.9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.2 Update Services For SAP Solutions unaffected 0:1.9.0-15.el8_2.9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support unaffected 0:1.11.0-8.el8_4.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Telecommunications Update Service unaffected 0:1.11.0-8.el8_4.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.4 Update Services For SAP Solutions unaffected 0:1.11.0-8.el8_4.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.6 Extended Update Support unaffected 0:1.12.0-6.el8_6.9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8.8 Extended Update Support unaffected 0:1.12.0-15.el8_8.7 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.13.1-3.el9_3.6 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:1.20.11-24.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9 unaffected 0:22.1.9-5.el9 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.0 Extended Update Support unaffected 0:1.11.0-22.el9_0.8 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 9.2 Extended Update Support unaffected 0:1.12.0-14.el9_2.5 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified

References

ReferenceSourceLinkTags
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
X.Org X Server, XWayland: Multiple Vulnerabilities (GLSA 202401-30) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org
[SECURITY] [DLA 3721-1] xorg-server security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2995 [email protected] access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
lists.fedoraproject.org/archives/list/[email protected]/messag... af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2169 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
[SECURITY] Fedora 39 Update: xorg-x11-server-Xwayland-23.2.4-1.fc39 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
access.redhat.com/errata/RHSA-2025:12751 [email protected] access.redhat.com
access.redhat.com/errata/RHSA-2024:2996 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
oss-security - Fwd: X.Org Security Advisory: Issues in X.Org X server prior to 21.1.11 and Xwayland prior to 23.2.4 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
access.redhat.com/errata/RHSA-2024:2170 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
Red Hat af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
[SECURITY] Fedora 39 Update: tigervnc-1.13.1-11.fc39 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
security.netapp.com/advisory/ntap-20240307-0006 af854a3a-2127-422b-91ae-364da2661108 security.netapp.com
2257691 – (CVE-2023-6816) CVE-2023-6816 xorg-x11-server: Heap buffer overflow in DeviceFocusEvent and ProcXIQueryPointer af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

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

Additional Advisory Data

SourceTimeEvent
CNA2024-01-10T00:00:00.000ZReported to Red Hat.
CNA2024-01-16T00:00:00.000ZMade public.

Workarounds

CNA: Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

Legacy QID Mappings

  • 161304 Oracle Enterprise Linux Security Update for xorg-x11-server (ELSA-2024-0320)
  • 161327 Oracle Enterprise Linux Security Update for tigervnc (ELSA-2024-0557)
  • 161328 Oracle Enterprise Linux Security Update for tigervnc (ELSA-2024-0607)
  • 161332 Oracle Enterprise Linux Security Update for tigervnc (ELSA-2024-0629)
  • 200051 Ubuntu Security Notification for X.Org X Server Vulnerabilities (USN-6587-1)
  • 200058 Ubuntu Security Notification for X.Org X Server Vulnerabilities (USN-6587-2)
  • 200193 Ubuntu Security Notification for X.Org X Server Vulnerabilities (USN-6587-5)
  • 242726 Red Hat Update for xorg-x11-server (RHSA-2024:0320)
  • 242772 Red Hat Update for tigervnc (RHSA-2024:0558)
  • 242774 Red Hat Update for tigervnc (RHSA-2024:0597)
  • 242782 Red Hat Update for tigervnc (RHSA-2024:0607)
  • 242793 Red Hat Update for tigervnc (RHSA-2024:0617)
  • 242794 Red Hat Update for tigervnc (RHSA-2024:0614)
  • 242808 Red Hat Update for tigervnc (RHSA-2024:0621)
  • 242812 Red Hat Update for tigervnc (RHSA-2024:0626)
  • 242825 Red Hat Update for tigervnc (RHSA-2024:0629)
  • 242833 Red Hat Update for tigervnc (RHSA-2024:0557)
  • 257302 CentOS Security Update for xorg-x11-server (CESA-2024:0320)
  • 257305 CentOS Security Update for tigervnc (CESA-2024:0629)
  • 284893 Fedora Security Update for xorg (FEDORA-2024-05db4bcbec)
  • 285034 Fedora Security Update for tigervnc (FEDORA-2024-5762d637dd)
  • 285036 Fedora Security Update for xorg (FEDORA-2024-da3d410b53)
  • 357225 Amazon Linux Security Advisory for xorg-x11-server : ALAS2-2024-2455
  • 357249 Amazon Linux Security Advisory for xorg-x11-server : ALAS2023-2024-522
  • 510677 Alpine Linux Security Update for xorg-server
  • 510678 Alpine Linux Security Update for xwayland
  • 6000440 Debian Security Update for xorg-server (DSA 5603-1)
  • 6000449 Debian Security Update for xorg-server (DLA 3721-1)
  • 673399 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1352)
  • 673626 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1232)
  • 673929 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1254)
  • 673935 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1330)
  • 674121 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1522)
  • 674159 EulerOS Security Update for xorg-x11-server (EulerOS-SA-2024-1501)
  • 691397 Free Berkeley Software Distribution (FreeBSD) Security Update for xorg server (7467c611-b490-11ee-b903-001fc69cd6dc)
  • 710847 Gentoo Linux X.Org X Server, XWayland Multiple Vulnerabilities (GLSA 202401-30)
  • 755633 SUSE Enterprise Linux Security Update for xwayland (SUSE-SU-2024:0165-1)
  • 908035 Common Base Linux Mariner (CBL-Mariner) Security Update for xorg-x11-server (33353)
  • 941559 AlmaLinux Security Update for tigervnc (ALSA-2024:0607)
  • 941561 AlmaLinux Security Update for tigervnc (ALSA-2024:0557)
  • 961113 Rocky Linux Security Update for tigervnc (RLSA-2024:0607)

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