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.
Affected versions
Linux kernel versions
3.3
and later are affected. Fixed in
5.10.267,
5.15.218,
6.1.185,
6.6.154,
6.12.106,
6.18.47,
7.1.11,
7.2.1,
7.3
and their respective stable series.
References
9 totalFrequently asked questions
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What is CVE-2026-80765?
CVE-2026-80765 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 3.3 onward and has been patched in 5.10.267, 5.15.218, 6.1.185 and others. CVE-2026-80765 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-80765?
Yes. CVE-2026-80765 has been patched. Fixed versions include 5.10.267, 5.15.218, 6.1.185 and others. If you are running Linux kernel 3.3 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2026-80765 actively exploited?
No. CVE-2026-80765 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.