PT-2026-64755 · Linux · Linux

CVE-2026-64524 · Published 2026-07-25 · Updated 2026-07-25

NVD

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.

Related Identifiers

CVE-2026-64524

Affected Products

Linux

References · 8

• https://nvd.nist.gov/vuln/detail/CVE-2026-64524 · Security Note
• https://git.kernel.org/stable/c/13d33b9ef67066c77c84273fac5a1d3fde3533d1 · Note
• https://git.kernel.org/stable/c/8a114b25b5521eae451b13bce98ae978624962e5 · Note
• https://git.kernel.org/stable/c/9c698b2c43c2667c34f5336bf46ad5786216ac2a · Note
• https://git.kernel.org/stable/c/1fb565b77b8f44afabb02de6310065f109d89e94 · Note
• https://git.kernel.org/stable/c/96f7de3172d4aa878b7f87173b2b3507c350fcd6 · Note
• https://git.kernel.org/stable/c/a321c908f2eeea01539668eb270d074d9b88e490 · Note
• https://git.kernel.org/stable/c/bc573752f3dac0d1ab8df7078c1851bc76717653 · Note