Unknown

CVE-2026-80765 — HID: hyperv: validate initial device info bounds

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.

Published Sep 4, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.2%

ahead of 9% of scored CVEs · Oct 28, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < e0d5d3e45e142b7ef7525654aaa54d3e986002a6≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 390d3d9c52a710fdc9de95a537747397c0c671d1≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 8614c043b11cc35ffebd35542ab4da275f8f923d≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 334271d3812ab3197c95b4593bc6745f8d189114≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < f84d777574b748b1a488723ca7be9d87a301a872≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 608f8fd8c0f7b6268da43509447802955f210aac≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 2529737763cb4bcfcaf397beeea2664656c865b4≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < c894143c508a7e063aab9f73c9e835ab40121283 and 2 more ≥ b95f5bcb811e3905b5376f87789da8d097fee682 and < 934b7778aa7b7c8f6bb073d2a73ba3674885bae0version 3.3	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 28, 2026 · 13 reading(s) · max 0.20%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 4, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

11 on the record

git.kernel.org/stable/c/f84d777574b748b1a488723ca7be9d87a301a872
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-80765
GitHub Security Advisories
git.kernel.org/stable/c/334271d3812ab3197c95b4593bc6745f8d189114
NIST National Vulnerability Database
git.kernel.org/stable/c/608f8fd8c0f7b6268da43509447802955f210aac
NIST National Vulnerability Database
git.kernel.org/stable/c/934b7778aa7b7c8f6bb073d2a73ba3674885bae0
NIST National Vulnerability Database
git.kernel.org/stable/c/e0d5d3e45e142b7ef7525654aaa54d3e986002a6
NIST National Vulnerability Database
git.kernel.org/stable/c/390d3d9c52a710fdc9de95a537747397c0c671d1
NIST National Vulnerability Database
git.kernel.org/stable/c/c894143c508a7e063aab9f73c9e835ab40121283
NIST National Vulnerability Database
git.kernel.org/stable/c/8614c043b11cc35ffebd35542ab4da275f8f923d
NIST National Vulnerability Database
git.kernel.org/stable/c/2529737763cb4bcfcaf397beeea2664656c865b4
NIST National Vulnerability Database
github.com/advisories/GHSA-cj68-x55r-245c
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 1d
Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 1d
Unknown CVE-2026-99207 scsi: target: Disable interrupts while holding delayed_cmd_lock 1d
Unknown CVE-2026-99208 drm/xe/oa: Zero OA buffer at allocation 1d
Unknown CVE-2026-99209 drm/xe: skip eviction of a BO with no resource 1d
Unknown CVE-2026-99210 accel/rocket: clear rdev on device init failure 1d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80765 is "HID: hyperv: validate initial device info bounds", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.20% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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