Xorg-x11-server: out-of-bounds write in xichangedeviceproperty/rrchangeoutputproperty (CVE-2023-5367)

Why this deserves its current priority

CVSS is 7.8. 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 scope and exposure questions

Affected software not mapped in the current feed; confirm the named product and version against your inventory.

Recommended response

Confirm exposure. Identify whether the named product or interface exists in your inventory, then review the linked upstream references for affected versions and vendor guidance.

Evidence timeline and material changes

Published upstream
Oct 25, 2023
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Jun 23, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Jun 23, 2026

Sources and claim methodology

Upstream source description

A out-of-bounds write flaw was found in the xorg-x11-server. This issue occurs due to an incorrect calculation of a buffer offset when copying data stored in the heap in the XIChangeDeviceProperty function in Xi/xiproperty.c and in RRChangeOutputProperty function in randr/rrproperty.c, allowing for possible escalation of privileges or denial of service.

Quoted source text, attributed separately from HOL analysis.