SB2026041559 - OpenBSD update for X.org Server

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Main Vulnerability Database SB2026041559

SB2026041559 - OpenBSD update for X.org Server

Published: April 15, 2026

Security Bulletin ID SB2026041559
Severity
Low
Patch available
YES
Number of vulnerabilities 5
Exploitation vector Local access
Highest impact Denial of service

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 5 secuirty vulnerabilities.


1) Integer underflow (CVE-ID: CVE-2026-33999)

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an integer underflow in XkbSetCompatMap() when processing a future request after a previously truncated compat buffer left unused space. A local user can gain access to sensitive information.


2) Out-of-bounds read (CVE-ID: CVE-2026-34000)

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in CheckSetGeom() when handling key alias entries and validating only the first key name. A local user can gain access to sensitive information.


3) Use-after-free (CVE-ID: CVE-2026-34001)

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a use-after-free in miSyncTriggerFence() when walking the list of fences to trigger. A local user can trigger fence processing to cause a denial of service.

The issue occurs because freeing the await resource removes subsequent trigger entries from the list during iteration.


4) Out-of-bounds read (CVE-ID: CVE-2026-34002)

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in CheckModifierMap() when parsing client request data without verifying that reads remain within request bounds. A local user disclose sensitive information.


5) Out-of-bounds read (CVE-ID: CVE-2026-34003)

The vulnerability allows a local user to disclose sensitive information.

The vulnerability exists due to an out-of-bounds read in CheckKeyTypes() when processing a client request without ensuring that reads remain within request bounds. A local user can gain access to sensitive information.


Remediation

Install update from vendor's website.

References