In the Linux kernel, the following vulnerability has been resolved: drm, fbcon, vga_switcheroo: Avoid race condition in fbcon setup Protect… (CVE-2025-68296)
Description
A race condition vulnerability in the Linux kernel's framebuffer console (fbcon) setup related to VGA switcheroo has been resolved. The issue involves improper locking around vga_switcheroo_client_fb_set(), which could lead to out-of-bounds access in fbcon_remap_all() due to a race condition when switching outputs. This affects certain GPU drivers including amdgpu, i915, nouveau, and radeon. The vulnerability has been fixed by moving the call to vga_switcheroo_client_fb_set() under fbcon_fb_registered(), which holds the console lock, preventing the race condition.
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2025-68296 concerns a race condition in the framebuffer console (fbcon) setup involving the drm, fbcon, and vga_switcheroo subsystems. The function vga_switcheroo_client_fb_set() was not properly protected by the console lock, causing a race with output switching and potentially leading to out-of-bounds access in fbcon_remap_all(). This occurs because fbcon uses the fb_info.node value as an index, which can be invalid (-1) if VGA switcheroo is set up before framebuffer registration. The fix moves vga_switcheroo_client_fb_set() to be called after framebuffer registration within fbcon_fb_registered(), which already holds the console lock, thus serializing the calls and preventing the race. This change affects only GPU drivers supporting vga_switcheroo: amdgpu, i915, nouveau, and radeon.
Potential Impact
If exploited, this race condition could lead to out-of-bounds memory access in the framebuffer console code, potentially causing system instability or crashes. The vulnerability affects systems using certain GPU drivers with vga_switcheroo support. There is no indication of remote exploitation or privilege escalation in the provided data. No known exploits in the wild have been reported.
Mitigation Recommendations
A patch is available and should be applied to affected Linux kernel versions. The fix involves changes in the kernel code to properly serialize framebuffer console setup calls by holding the console lock. Users should update to a Linux kernel version that includes this fix as provided by their distribution vendor. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2025-68296
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
Threat ID: 6a5b64792d1edb114c8dd343
Added to database: 07/18/2026, 11:33:13 UTC
Last enriched: 09/15/2026, 11:19:17 UTC
Last updated: 10/08/2026, 06:48:14 UTC
Views: 29
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