Evidence-led vulnerability intelligence · 2026-09-04 21:48 IST

CVE-2026-80765

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.

UNRATED · N/ALinux

Executive briefing

The source record describes: 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. The practical risk depends on whether an affected product/version is present, reachable and configured in an exploitable way. Review the affected-product evidence and linked vendor advisories before assigning exposure status.

Assessment: Potential exposure only — validate the installed product, exact version, configuration and vendor applicability before treating an asset as confirmed vulnerable.

Evidence confidence: Low Evidence-derived, not an exploitability verdict

Severity & attack characteristics

N/A / 10 ·

CVSS vector:

No CVSS vector is currently available in the source record.

Technical explanation & impact

The technical mechanism is not expanded beyond the source description unless a referenced advisory supplies additional evidence. Read the linked vendor/CERT advisories for root-cause detail.

Potential impact must be interpreted from the published CVSS impact metrics and the affected component. A CVSS impact score is not proof that a particular asset is exploitable.

Affected products and versions

NVD has not supplied machine-readable vulnerable CPE product/version entries for this CVE. This is an information gap, not proof that no products are affected. Check the vendor advisory references below.

Remediation & validation

Identify exposure by comparing the affected product and version ranges with your asset inventory, SBOM and externally exposed services.
Review the linked vendor security advisory or patch notes. Upgrade to a vendor-confirmed fixed release; do not infer a fixed version from the CVE description.
Until patched, consider restricting network access or disabling the affected feature where operationally safe. These are temporary controls, not a substitute for a vendor fix.
Validate the remediation with a version check and vulnerability rescan, then retain change evidence.

No fixed version is displayed unless it is explicitly established by a vendor advisory. Follow the vendor's release notes for exact product and branch applicability.

Vendor advisories, patches & exploit references

https://git.kernel.org/stable/c/2529737763cb4bcfcaf397beeea2664656c865b4 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/334271d3812ab3197c95b4593bc6745f8d189114 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/390d3d9c52a710fdc9de95a537747397c0c671d1 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/608f8fd8c0f7b6268da43509447802955f210aac REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/8614c043b11cc35ffebd35542ab4da275f8f923d REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/934b7778aa7b7c8f6bb073d2a73ba3674885bae0 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/c894143c508a7e063aab9f73c9e835ab40121283 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/e0d5d3e45e142b7ef7525654aaa54d3e986002a6 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/f84d777574b748b1a488723ca7be9d87a301a872 REFERENCE 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Information gaps & confidence notes

These gaps indicate missing source data. CVE Watch does not fill them with guessed product, exploit or patch details.

NVD does not currently provide machine-readable vulnerable CPE product/version entries for this record.
No vendor advisory or patch reference was identified in the supplied CVE references.
No CVSS vector is currently available in the source record.
No CWE classification is currently available.

Last enrichment: 2026-11-07T16:58:37+00:00 · Source last modified: 2026-11-06T17:19:58.170

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