Answer in brief
CVE-2023-6816 records a Critical severity (CVSS 9.8) vulnerability in Xorg-x11-server: heap buffer overflow in devicefocusevent and procxiquerypointer. The current sources do not mark it as known exploited. Affected software not mapped in the current feed; confirm the named product and version against your inventory.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 9.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
Affected software not mapped in the current feed; confirm the named product and version against your inventory.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:a:x.org:x_server:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:a:x.org:xwayland:*:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
| cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* | Not reported | Not reported |
Published upstream
Jan 18, 2024
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Nov 4, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Nov 4, 2026
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.
Quoted source text, attributed separately from HOL analysis.