CVE-2026-80676

Kernel use-after-free via unlocked driver override

Published Aug 28, 2026 · Updated Aug 28, 2026

Use-after-free in the Linux kernel VMBus driver allows attackers to trigger a stale memory access during concurrent driver probing. The hv_vmbus_get_id path reads driver_override from vmbus_match without the device lock while the driver core can replace or free that string. The race is confined to Hyper-V guests using VMBus driver overrides, and the upstream disclosure identifies no resulting crash or privilege gain.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel VMBus driver allows attackers to trigger a stale memory access during concurrent driver probing. The hv_vmbus_get_id path reads driver_override from vmbus_match without the device lock while the driver core can replace or free that string. The race is confined to Hyper-V guests using VMBus driver overrides, and the upstream disclosure identifies no resulting crash or privilege gain.

The record

CVE
CVE-2026-80676
Published
Aug 28, 2026
Updated
Aug 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Aug 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 28, 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=4.20
  2. Affected versionversion=d765edbb301c0e196015a59b17420558088ea33f <0e2f0833556c8c5269deb457b89d538644a3b747
  3. Affected versionversion=d765edbb301c0e196015a59b17420558088ea33f <2fb010ea7ca98cd09a6d365260b769f627e73a76
  4. Affected versionversion=d765edbb301c0e196015a59b17420558088ea33f <331d8900121a1d74ecd45cd2db742ddcb5a0a565
  5. Affected versionversion=d765edbb301c0e196015a59b17420558088ea33f <d1cb12ae81d2f7a58b0b1cfb51862afca98e6058

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=4.20; version=d765edbb301c0e196015a59b17420558088ea33f <0e2f0833556c8c5269deb457b89d538644a3b747; version=d765edbb301c0e196015a59b17420558088ea33f <2fb010ea7ca98cd09a6d365260b769f627e73a76; version=d765edbb301c0e196015a59b17420558088ea33f <331d8900121a1d74ecd45cd2db742ddcb5a0a565; version=d765edbb301c0e196015a59b17420558088ea33f <d1cb12ae81d2f7a58b0b1cfb51862afca98e6058

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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