CVE-2026-64524

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < 96f7de3172d4aa878b7f87173b2b3507c350fcd6affected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < bc573752f3dac0d1ab8df7078c1851bc76717653affected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < 1fb565b77b8f44afabb02de6310065f109d89e94affected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < a321c908f2eeea01539668eb270d074d9b88e490affected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < 9c698b2c43c2667c34f5336bf46ad5786216ac2aaffected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < 8a114b25b5521eae451b13bce98ae978624962e5affected
LinuxLinux76c56a5affeba1e163b66b9d8cc192e6154466f0 < 13d33b9ef67066c77c84273fac5a1d3fde3533d1affected
LinuxLinux5.14affected
LinuxLinux0 < 5.14unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.93 <= 6.12.*unaffected
LinuxLinux6.18.35 <= 6.18.*unaffected
LinuxLinux7.0.12 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References