CVE-2026-64284

Guest-state corruption via skipped KVM exit handling

Published Jul 25, 2026 · Updated Jul 25, 2026

Data integrity failure in Linux Kernel KVM allows local users to omit guest writes from dirty logs during a vCPU userspace exit. Fastpath exits return from KVM_RUN before the vendor exit handler runs, so VMX can leave its PML buffer unflushed and the final writes unmarked. Exploitation requires access to a VM vCPU descriptor and PML dirty logging; affected migration or restore state can contain stale pages, causing guest corruption, a crash, or a hang without a host escape.

CVSS severity7.1
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data integrity failure in Linux Kernel KVM allows local users to omit guest writes from dirty logs during a vCPU userspace exit. Fastpath exits return from KVM_RUN before the vendor exit handler runs, so VMX can leave its PML buffer unflushed and the final writes unmarked. Exploitation requires access to a VM vCPU descriptor and PML dirty logging; affected migration or restore state can contain stale pages, causing guest corruption, a crash, or a hang without a host escape.

The record

CVE
CVE-2026-64284
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1565.001, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=6.12
  2. Affected versionversion=f7f39c50edb9d336274371953275e0d3503b9b75 <0ffedf43910e44b76c2c1db4e9fbf12b268190c1
  3. Affected versionversion=f7f39c50edb9d336274371953275e0d3503b9b75 <4ad73ef0e7966ecfe67de0060537b4cb14d9acd4
  4. Affected versionversion=f7f39c50edb9d336274371953275e0d3503b9b75 <b3436d9b9b1affe1c3191ac9831308923f5f03c3
  5. Affected versionversion=f7f39c50edb9d336274371953275e0d3503b9b75 <f2ca2b5326211bd38490f0497eb583721ce0bbc0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.12; version=f7f39c50edb9d336274371953275e0d3503b9b75 <0ffedf43910e44b76c2c1db4e9fbf12b268190c1; version=f7f39c50edb9d336274371953275e0d3503b9b75 <4ad73ef0e7966ecfe67de0060537b4cb14d9acd4; version=f7f39c50edb9d336274371953275e0d3503b9b75 <b3436d9b9b1affe1c3191ac9831308923f5f03c3; version=f7f39c50edb9d336274371953275e0d3503b9b75 <f2ca2b5326211bd38490f0497eb583721ce0bbc0

Published CVSS scores

7.1LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H

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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1565.001Stored Data Manipulation
T1499.004Application 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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