CVE-2026-64524 - drm/hyperv: validate resolution_count and fix WIN8 fallback

CVE-2026-64524 - drm/hyperv: validate resolution_count and fix WIN8 fallback

https://cvefeed.io/rssfeed/latest.atom / Sat, 07/25/2026 - 13:07
CVE ID :CVE-2026-64524
Published : July 25, 2026, 10:17 a.m. | 33 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: drm/hyperv: validate resolution_count and fix WIN8 fallback A SYNTHVID_RESOLUTION_RESPONSE with resolution_count > 64 walks past the supported_resolution[SYNTHVID_MAX_RESOLUTION_COUNT] array in the parse loop. Bound resolution_count against the array size, folded into the existing zero-check. When the WIN10 resolution probe fails, the caller in hyperv_connect_vsp() left hv->screen_*_max / preferred_* unpopulated, which sets mode_config.max_width / max_height to 0 and makes drm_internal_framebuffer_create() reject every userspace framebuffer with -EINVAL. The pre-WIN10 branch had the same gap for preferred_width / preferred_height. Use a single post-probe fallback guarded by screen_width_max == 0 so both paths converge on the WIN8 defaults.
Severity: 0.0 | NA
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