CVE-2026-64524
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]…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.14%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.7 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- EPSS
- 0.14% probability · 4th percentile
- CISA KEV
- Not listed
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1
- https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94
- https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5
- https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6
- https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a
- https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490
- https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.