ZDI-26-766: X.Org Server RandR Heap-based Buffer Overflow Privilege Escalation Vulnerability

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

1. Oct 15, 2026 · Zero Day Initiative

   Detected

   This vulnerability allows local attackers to escalate privileges on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-93521.

Sources

• CVE.orgVulnerability recordCVE-2026-93521

  Official CVE identifier

  cve.org
• Zero Day InitiativeCoordinated disclosureZDI-26-766

  This vulnerability allows local attackers to escalate privileges on affected installations of X.Org Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-93521.

  zerodayinitiative.com