Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode Stop… (CVE-2026-31767)
A vulnerability in the Linux kernel's drm/i915/dsi driver component involved improper horizontal timing adjustments in command mode related to Display Stream Compression (DSC). This flaw could cause a division-by-zero error on some machines, potentially leading to a denial of service. The issue has been resolved by stopping horizontal timing adjustments in command mode, aligning behavior with specifications and other drivers. The vulnerability is rated medium severity with a CVSS score of 5.5 and affects multiple Linux kernel versions prior to 6.8.0 and related builds. A patch is available and included in recent Linux kernel updates.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-31767 pertains to the drm/i915/dsi driver where horizontal timing values were improperly adjusted based on the compression ratio in command mode. This adjustment should only occur in video mode per specifications and Windows driver behavior. The incorrect adjustment could result in an adjusted horizontal total (htotal) so small that the calculated line time (line_time_us) becomes zero, causing a division-by-zero error and kernel instability when the driver loads. The fix stops these horizontal timing adjustments in command mode, preventing the kernel from crashing. This vulnerability affects multiple Linux kernel versions prior to 6.8.0 and its variants. The patch is included in official Linux kernel updates and Ubuntu security notices USN-8567-1 and USN-8574-1.
Potential Impact
The vulnerability can cause a denial of service by triggering a division-by-zero error in the kernel's display driver when loading the driver on affected systems. There is no indication of confidentiality or integrity impact. The CVSS score of 5.5 reflects a medium severity with local attack vector, low complexity, low privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A patch is available and has been incorporated into Linux kernel versions 6.8.0 and later and related Ubuntu kernel packages. Users should update their systems to these fixed kernel versions and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor advisories such as Ubuntu Security Notices USN-8567-1 and USN-8574-1 for detailed update instructions.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: drm/i915/dsi: Don't do DSC horizontal timing adjustments in command mode Stop… (CVE-2026-31767)
Description
A vulnerability in the Linux kernel's drm/i915/dsi driver component involved improper horizontal timing adjustments in command mode related to Display Stream Compression (DSC). This flaw could cause a division-by-zero error on some machines, potentially leading to a denial of service. The issue has been resolved by stopping horizontal timing adjustments in command mode, aligning behavior with specifications and other drivers. The vulnerability is rated medium severity with a CVSS score of 5.5 and affects multiple Linux kernel versions prior to 6.8.0 and related builds. A patch is available and included in recent Linux kernel updates.
CVSS v3.1
Score 5.5medium
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=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-31767 pertains to the drm/i915/dsi driver where horizontal timing values were improperly adjusted based on the compression ratio in command mode. This adjustment should only occur in video mode per specifications and Windows driver behavior. The incorrect adjustment could result in an adjusted horizontal total (htotal) so small that the calculated line time (line_time_us) becomes zero, causing a division-by-zero error and kernel instability when the driver loads. The fix stops these horizontal timing adjustments in command mode, preventing the kernel from crashing. This vulnerability affects multiple Linux kernel versions prior to 6.8.0 and its variants. The patch is included in official Linux kernel updates and Ubuntu security notices USN-8567-1 and USN-8574-1.
Potential Impact
The vulnerability can cause a denial of service by triggering a division-by-zero error in the kernel's display driver when loading the driver on affected systems. There is no indication of confidentiality or integrity impact. The CVSS score of 5.5 reflects a medium severity with local attack vector, low complexity, low privileges required, no user interaction, and impact limited to availability.
Mitigation Recommendations
A patch is available and has been incorporated into Linux kernel versions 6.8.0 and later and related Ubuntu kernel packages. Users should update their systems to these fixed kernel versions and reboot to apply the changes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules may be required. Follow vendor advisories such as Ubuntu Security Notices USN-8567-1 and USN-8574-1 for detailed update instructions.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-31767
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro: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","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
Threat ID: 6a5a039f91ae9bcd3f856b24
Added to database: 07/17/2026, 10:27:43 UTC
Last enriched: 08/01/2026, 23:18:07 UTC
Last updated: 09/10/2026, 19:36:53 UTC
Views: 45
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