CVE-2026-64286

EL2 memory access via uncleared vCPU pointer

Published Jul 25, 2026 · Updated Jul 25, 2026

Improper pointer handling in Linux Kernel KVM for arm64 allows local users to access protected EL2 hypervisor memory. flush_hyp_vcpu() copies the host vCPU context verbatim into the private hypervisor vCPU without clearing __hyp_running_vcpu before ctxt_to_vcpu() dereferences it. Exploitation requires high privileges on a pKVM host and lets a host-controlled pointer cross the host-to-EL2 isolation boundary.

CVSS severity8.2
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper pointer handling in Linux Kernel KVM for arm64 allows local users to access protected EL2 hypervisor memory. flush_hyp_vcpu() copies the host vCPU context verbatim into the private hypervisor vCPU without clearing __hyp_running_vcpu before ctxt_to_vcpu() dereferences it. Exploitation requires high privileges on a pKVM host and lets a host-controlled pointer cross the host-to-EL2 isolation boundary.

The record

CVE
CVE-2026-64286
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
admin

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=be66e67f175096f283c9d5614c4991fc9e7ed975 <477145860dba4c30f0b4e36f02f4c5291c1c888b
  3. Affected versionversion=be66e67f175096f283c9d5614c4991fc9e7ed975 <6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa
  4. Affected versionversion=be66e67f175096f283c9d5614c4991fc9e7ed975 <d4f4d61715d1061ba83b88196a3605662be30750
  5. Affected versionversion=be66e67f175096f283c9d5614c4991fc9e7ed975 <dfaef40d8a1533940fc1af788d70fce07362b4ce
  6. Affected versionversion=be66e67f175096f283c9d5614c4991fc9e7ed975 <e8042f6e1d7befb2fb6b10a75918642bcd0acf9a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=be66e67f175096f283c9d5614c4991fc9e7ed975 <477145860dba4c30f0b4e36f02f4c5291c1c888b; version=be66e67f175096f283c9d5614c4991fc9e7ed975 <6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa; version=be66e67f175096f283c9d5614c4991fc9e7ed975 <d4f4d61715d1061ba83b88196a3605662be30750; version=be66e67f175096f283c9d5614c4991fc9e7ed975 <dfaef40d8a1533940fc1af788d70fce07362b4ce; version=be66e67f175096f283c9d5614c4991fc9e7ed975 <e8042f6e1d7befb2fb6b10a75918642bcd0acf9a

Published CVSS scores

8.2LinuxCVSS:3.1/AV:L/AC:L/PR:H/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.

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

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
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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