CVE-2026-64555

Guest-to-host escape via untranslated vCPU state

Published Jul 27, 2026 · Updated Jul 27, 2026

Privilege escalation in the Linux Kernel KVM arm64 subsystem allows local users to execute code in the host hypervisor. kvm_hyp_handle_mops() writes a synthetic vcpu_cpsr() value directly to SPSR_EL2 without translating the nested vEL2 state, enabling a controlled ERET into host EL2. Exploitation requires a nested-capable KVM guest and code running at guest vEL2; successful access can read or alter host and other-guest memory, while failed attempts can panic the host.

CVSS severity8.8
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

Privilege escalation in the Linux Kernel KVM arm64 subsystem allows local users to execute code in the host hypervisor. kvm_hyp_handle_mops() writes a synthetic vcpu_cpsr() value directly to SPSR_EL2 without translating the nested vEL2 state, enabling a controlled ERET into host EL2. Exploitation requires a nested-capable KVM guest and code running at guest vEL2; successful access can read or alter host and other-guest memory, while failed attempts can panic the host.

The record

CVE
CVE-2026-64555
Published
Jul 27, 2026
Updated
Jul 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 27, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 27, 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=2de451a329cf662beeba71f63c7f83ee24ca6642 <10a568010e827108d149779908850afaec898846
  2. Affected versionversion=2de451a329cf662beeba71f63c7f83ee24ca6642 <884b44256041ec6b2dcbe8e6a67384d26145cba1
  3. Affected versionversion=2de451a329cf662beeba71f63c7f83ee24ca6642 <dd3b237eb7780d65eae296d3d3a70012b6e7a02f
  4. Affected versionversion=2de451a329cf662beeba71f63c7f83ee24ca6642 <ff1022c3de46753eb7eba2f6efd990569e66ff95
  5. Affected versionversion=6.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2de451a329cf662beeba71f63c7f83ee24ca6642 <10a568010e827108d149779908850afaec898846; version=2de451a329cf662beeba71f63c7f83ee24ca6642 <884b44256041ec6b2dcbe8e6a67384d26145cba1; version=2de451a329cf662beeba71f63c7f83ee24ca6642 <dd3b237eb7780d65eae296d3d3a70012b6e7a02f; version=2de451a329cf662beeba71f63c7f83ee24ca6642 <ff1022c3de46753eb7eba2f6efd990569e66ff95; version=6.7

Published CVSS scores

8.8Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/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

T1068Exploitation for Privilege Escalation

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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