CVE-2026-80765

Description

In the Linux kernel, the following vulnerability has been resolved: HID: hyperv: validate initial device info bounds The Hyper-V synthetic HID host supplies SYNTH_HID_INITIAL_DEVICE_INFO messages that contain a HID descriptor followed by the report descriptor bytes. mousevsc_on_receive_device_info() trusts bLength and wDescriptorLength without checking that the received packet contains both byte ranges. A malformed host or backend message can therefore make the guest read past the received VMBus packet while copying the report descriptor. Pass the received initial-device-info size into the parser and reject descriptor lengths that exceed the packet. Impact: A malicious Hyper-V host or backend can crash a guest by sending a short initial device-info message with an oversized HID report descriptor length.

References

• https://git.kernel.org/stable/c/2529737763cb4bcfcaf397beeea2664656c865b4
• https://git.kernel.org/stable/c/334271d3812ab3197c95b4593bc6745f8d189114
• https://git.kernel.org/stable/c/390d3d9c52a710fdc9de95a537747397c0c671d1
• https://git.kernel.org/stable/c/608f8fd8c0f7b6268da43509447802955f210aac
• https://git.kernel.org/stable/c/8614c043b11cc35ffebd35542ab4da275f8f923d