CVE-2026-80765
HID: hyperv: validate initial device info bounds
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.
INFO
Published Date :
Sept. 4, 2026, 4:18 p.m.
Last Modified :
Sept. 4, 2026, 4:18 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Apply kernel updates to validate HID descriptor bounds.
- Reject oversized HID descriptor lengths in messages.
- Ensure received packet contains all byte ranges.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-80765.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-80765 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-80765
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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CVE-2026-80765 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-80765 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 04, 2026
Action Type Old Value New Value Added 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. Added Affected New affected value received. <a href="https://github.com/CVEProject/cvelistV5/blob/main/cves/2026/80xxx/CVE-2026-80765.json">CVE-2026-80765</a> Added Reference https://git.kernel.org/stable/c/2529737763cb4bcfcaf397beeea2664656c865b4 Added Reference https://git.kernel.org/stable/c/334271d3812ab3197c95b4593bc6745f8d189114 Added Reference https://git.kernel.org/stable/c/390d3d9c52a710fdc9de95a537747397c0c671d1 Added Reference https://git.kernel.org/stable/c/608f8fd8c0f7b6268da43509447802955f210aac Added Reference https://git.kernel.org/stable/c/8614c043b11cc35ffebd35542ab4da275f8f923d Added Reference https://git.kernel.org/stable/c/934b7778aa7b7c8f6bb073d2a73ba3674885bae0 Added Reference https://git.kernel.org/stable/c/c894143c508a7e063aab9f73c9e835ab40121283 Added Reference https://git.kernel.org/stable/c/e0d5d3e45e142b7ef7525654aaa54d3e986002a6 Added Reference https://git.kernel.org/stable/c/f84d777574b748b1a488723ca7be9d87a301a872