CVE-2023-6816
Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer
CVSS Score
9.8
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-787 |
| Vendor | red hat |
| Product | red hat enterprise linux 6 extended lifecycle support - extension |
| Published | Jan 18, 2024 |
| Last Updated | Mar 19, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 6 Extended Lifecycle Support - EXTENSION
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 7
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8.2 Advanced Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.2 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.2 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Telecommunications Update Service
All versions affected Red Hat / Red Hat Enterprise Linux 8.4 Update Services for SAP Solutions
All versions affected Red Hat / Red Hat Enterprise Linux 8.6 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 8.8 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 9.0 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 9.2 Extended Update Support
All versions affected Red Hat / Red Hat Enterprise Linux 6
All versions affected References
access.redhat.com: 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: https://access.redhat.com/errata/RHSA-2024:0597 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0607 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0614 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0617 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0621 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0626 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:0629 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2169 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2170 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2995 access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2996 access.redhat.com: https://access.redhat.com/errata/RHSA-2025:12751 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-6816 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2257691 openwall.com: http://www.openwall.com/lists/oss-security/2024/01/18/1 lists.debian.org: https://lists.debian.org/debian-lts-announce/2024/01/msg00016.html lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/5J4H7CH565ALSZZYKOJFYDA5KFLG6NUK/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/EJBMCWQ54R6ZL3MYU2D2JBW6JMZL7BQW/ lists.fedoraproject.org: https://lists.fedoraproject.org/archives/list/[email protected]/message/IZ75X54CN4IFYMIV7OK3JVZ57FHQIGIC/ security.gentoo.org: https://security.gentoo.org/glsa/202401-30 security.netapp.com: https://security.netapp.com/advisory/ntap-20240307-0006/
Credits
Red Hat would like to thank Jan-Niklas Sohn (Trend Micro Zero Day Initiative) for reporting this issue.