CVE-2026-31767 Linux CVE debrief

Who should care

Linux distribution maintainers, kernel backport teams, OEMs shipping affected Intel graphics/i915 stacks, and administrators of systems that use the affected Linux kernel branches or DSI/DSC display paths.

Technical summary

The kernel change addresses a bug in drm/i915/dsi: in command mode, horizontal timing values were being adjusted based on compression ratio even though the fix description says that behavior should apply only in video mode. On some systems the adjusted htotal became so small that line_time_us evaluated to 0 during vtotal calculation, causing a division-by-zero and kernel crash when the driver loaded. NVD maps the issue to Linux kernel ranges including 5.6 through before 6.12.81, 6.13 through before 6.18.22, 6.19 through before 6.19.12, and 7.0 release candidates rc1 through rc6.

Defensive priority

Medium

Recommended defensive actions

• Apply the linked stable kernel patches or vendor kernel updates for all affected Linux kernel branches.
• Prioritize patching systems that use the i915 DRM driver and DSI display paths, especially where command mode panels are in use.
• Verify fleet kernel versions against the NVD vulnerable version ranges and backport the fix where a full kernel upgrade is not immediately possible.

Evidence notes

This debrief is based on the NVD CVE record, its listed affected-version criteria, the CVSS vector, and the linked stable kernel patch references. The kernel description explicitly states the command-mode timing adjustment change and the resulting division-by-zero condition. No exploit code or reproduction guidance is included.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.