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.
Affected products
linux: linux kernel
References7
- git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1 Patch
- git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94 Patch
- git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5 Patch
- git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6 Patch
- git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a Patch
- git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490 Patch
- git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653 Patch
Metrics
- CVSS 3.1
-
7.7
HIGH
Score source: CNA
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H - EPSS — exploit probability
- 0% percentile: 4 · as of 13 November 2026
- CWE
- CWE-122
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