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CVE-2025-68296

kernel: Linux kernel: Denial of Service due to race condition in fbcon setup

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Severity

Moderate

Red Hat Product Security

4.7

CVSS 3.1

Review impact separately from score.

Published · December 16, 2025

Updated · June 30, 2026

Description

A flaw was found in the Linux kernel. A local user could exploit a race condition in the framebuffer console (fbcon) setup, specifically within the VGA switcheroo component. This race condition occurs when vga_switcheroo_client_fb_set() races with switching outputs, leading to an out-of-bounds (OOB) access in fbcon_remap_all(). This can result in a denial of service (DoS) to the system.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 4.7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition