In the Linux kernel, the following vulnerability has been resolved: drm/hyperv: validate...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (9)
- https://nvd.nist.gov/vuln/detail/CVE-2026-64524
- 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
- https://github.com/advisories/GHSA-2rhv-cg46-xrx8