CVE-2026-68093

KVM emulation failure via hotplug ASID collision

Published Aug 10, 2026 · Updated Aug 10, 2026

ASID collision in affected Linux KVM SVM kernels allows guest OS users to trigger stale translations and KVM emulation failure. svm_enable_virtualization_cpu() resets the per-CPU generation on every online event, letting a blocked vCPU's saved generation and ASID match an identifier reassigned to another VM. Exploitation requires AMD SVM virtualization, vCPUs from different VMs sharing a physical CPU, and an offline-online hotplug cycle while one vCPU remains blocked.

CVSS severity7.0
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ASID collision in affected Linux KVM SVM kernels allows guest OS users to trigger stale translations and KVM emulation failure. svm_enable_virtualization_cpu() resets the per-CPU generation on every online event, letting a blocked vCPU's saved generation and ASID match an identifier reassigned to another VM. Exploitation requires AMD SVM virtualization, vCPUs from different VMs sharing a physical CPU, and an offline-online hotplug cycle while one vCPU remains blocked.

The record

CVE
CVE-2026-68093
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=2.6.21
  2. Affected versionversion=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <0f33b1c457c2199ed130b92cc2ff363a3f7b9415
  3. Affected versionversion=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <25f744ffa0c8e799e06250ce2e618367b166b0d4
  4. Affected versionversion=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <60283726f2845bd78b95efbd0e50b93944780477
  5. Affected versionversion=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <6b542d116acecb83a1ca34e8eace304cff6a4ec9
  6. Affected versionversion=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <7508916b4b55d6f5ecc68cd09774dabd3a6b4440

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.21; version=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <0f33b1c457c2199ed130b92cc2ff363a3f7b9415; version=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <25f744ffa0c8e799e06250ce2e618367b166b0d4; version=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <60283726f2845bd78b95efbd0e50b93944780477; version=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <6b542d116acecb83a1ca34e8eace304cff6a4ec9; version=774c47f1d78e373a6bd2964f4e278d1ce26c21cb <7508916b4b55d6f5ecc68cd09774dabd3a6b4440

Published CVSS scores

7.0Oracle LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/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
Privilegesauthenticated
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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