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.
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
- Sep 4, 2026CVE publishedPublication date reported by the CVE source.
- 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?
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- Affected versionversion=3.3
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <2529737763cb4bcfcaf397beeea2664656c865b4
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <334271d3812ab3197c95b4593bc6745f8d189114
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <390d3d9c52a710fdc9de95a537747397c0c671d1
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <608f8fd8c0f7b6268da43509447802955f210aac
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <8614c043b11cc35ffebd35542ab4da275f8f923d
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <934b7778aa7b7c8f6bb073d2a73ba3674885bae0
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <c894143c508a7e063aab9f73c9e835ab40121283
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <e0d5d3e45e142b7ef7525654aaa54d3e986002a6
- Affected versionversion=b95f5bcb811e3905b5376f87789da8d097fee682 <f84d777574b748b1a488723ca7be9d87a301a872
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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