Display initialization hang via unsupported fallback mode
Published Jul 12, 2024 · Updated May 23, 2026
Improper input validation in Linux Exynos HDMI allows local users to stall display initialization after an EDID read failure. The Exynos HDMI get_modes path returns no mode when EDID retrieval fails, causing DRM core to synthesize a 1024x768 fallback that some Exynos4 HDMI variants cannot drive. Reachability requires affected Exynos HDMI hardware and local high-privileged access; the resulting PLL and VSYNC failures can hang display startup.
Summary
What happened
Improper input validation in Linux Exynos HDMI allows local users to stall display initialization after an EDID read failure. The Exynos HDMI get_modes path returns no mode when EDID retrieval fails, causing DRM core to synthesize a 1024x768 fallback that some Exynos4 HDMI variants cannot drive. Reachability requires affected Exynos HDMI hardware and local high-privileged access; the resulting PLL and VSYNC failures can hang display startup.
The record
- CVE
- CVE-2024-40916
- Published
- Jul 12, 2024
- Updated
- May 23, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-20
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 12, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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