CVE-2026-80765Hinoki check available

Guest crash via unchecked HID descriptor lengths

Published Sep 4, 2026 · Updated Sep 4, 2026

Out-of-bounds read in the Linux Hyper-V HID guest driver allows attackers controlling the host or backend to crash the guest via malformed device info. In mousevsc_on_receive_device_info() in drivers/hid/hid-hyperv.c, bLength and wDescriptorLength are trusted without verifying that the received VMBus packet contains both declared descriptor ranges. The fault is reachable only through the Hyper-V host or synthetic-device backend and crashes the guest while the report descriptor is copied.

CVSS severityUnavailable
Unscored
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds read in the Linux Hyper-V HID guest driver allows attackers controlling the host or backend to crash the guest via malformed device info. In mousevsc_on_receive_device_info() in drivers/hid/hid-hyperv.c, bLength and wDescriptorLength are trusted without verifying that the received VMBus packet contains both declared descriptor ranges. The fault is reachable only through the Hyper-V host or synthetic-device backend and crashes the guest while the report descriptor is copied.

The record

CVE
CVE-2026-80765
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
Unavailable
Privileges
admin

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.3
  2. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <2529737763cb4bcfcaf397beeea2664656c865b4
  3. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <334271d3812ab3197c95b4593bc6745f8d189114
  4. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <390d3d9c52a710fdc9de95a537747397c0c671d1
  5. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <608f8fd8c0f7b6268da43509447802955f210aac
  6. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <8614c043b11cc35ffebd35542ab4da275f8f923d
  7. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <934b7778aa7b7c8f6bb073d2a73ba3674885bae0
  8. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <c894143c508a7e063aab9f73c9e835ab40121283
  9. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <e0d5d3e45e142b7ef7525654aaa54d3e986002a6
  10. Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <f84d777574b748b1a488723ca7be9d87a301a872

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3.3; version=b95f5bcb811e3905b5376f87789da8d097fee682 <2529737763cb4bcfcaf397beeea2664656c865b4; version=b95f5bcb811e3905b5376f87789da8d097fee682 <334271d3812ab3197c95b4593bc6745f8d189114; version=b95f5bcb811e3905b5376f87789da8d097fee682 <390d3d9c52a710fdc9de95a537747397c0c671d1; version=b95f5bcb811e3905b5376f87789da8d097fee682 <608f8fd8c0f7b6268da43509447802955f210aac; version=b95f5bcb811e3905b5376f87789da8d097fee682 <8614c043b11cc35ffebd35542ab4da275f8f923d; version=b95f5bcb811e3905b5376f87789da8d097fee682 <934b7778aa7b7c8f6bb073d2a73ba3674885bae0; version=b95f5bcb811e3905b5376f87789da8d097fee682 <c894143c508a7e063aab9f73c9e835ab40121283; version=b95f5bcb811e3905b5376f87789da8d097fee682 <e0d5d3e45e142b7ef7525654aaa54d3e986002a6; version=b95f5bcb811e3905b5376f87789da8d097fee682 <f84d777574b748b1a488723ca7be9d87a301a872

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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