X.Org Server XInput Passive Grab Use-After-Free Information Disclosure Vulnerability

October 15th, 2026
ZDI-26-761 ZDI-CAN-31832

CVE ID

CVE-2026-93516

CVSS Score

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

Affected Vendors

X.Org

Affected Products

Server

Vulnerability Details

This vulnerability allows local attackers to disclose sensitive information 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 specific flaw exists within the handling of DeviceInt objects. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of root.

Additional Details

X.Org has issued an update to correct this vulnerability. More details can be found at:
https://gitlab.freedesktop.org/xorg/xserver/-/commit/be5726341588

Disclosure Timeline

  • 2026-08-25 - Vulnerability reported to vendor
  • 2026-10-15 - Coordinated public release of advisory
  • 2026-10-15 - Advisory Updated

Credit

Anonymous

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