CVE-2026-46295

Kernel warning via posted-interrupt synchronization race

Published Jun 8, 2026 · Updated Jun 8, 2026

Race condition in Linux Kernel KVM allows local users to trigger a spurious kernel warning through nested virtualization. The race lets a second posted-interrupt synchronization observe PID.ON with an empty PIR, causing __kvm_apic_update_irr to return -1 without scanning the existing IRR. Triggering it requires local low-privilege access and nested KVM interrupt delivery; the interrupt remains queued, but an L2 VM-entry and VM-exit cycle is wasted.

CVSS severity5.5
Medium
EPSS probability0.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux Kernel KVM allows local users to trigger a spurious kernel warning through nested virtualization. The race lets a second posted-interrupt synchronization observe PID.ON with an empty PIR, causing __kvm_apic_update_irr to return -1 without scanning the existing IRR. Triggering it requires local low-privilege access and nested KVM interrupt delivery; the interrupt remains queued, but an L2 VM-entry and VM-exit cycle is wasted.

The record

CVE
CVE-2026-46295
Published
Jun 8, 2026
Updated
Jun 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 8, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 8, 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=6.16
  2. Affected versionversion=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <33fd0ccd2590b470b65adcca288615ad3b5e3e06
  3. Affected versionversion=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <4b6b06a8b12bfd95f9015074b1430c1480908073
  4. Affected versionversion=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <bb1703949dcaa9a49c338dee075f659f4634214d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.16; version=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <33fd0ccd2590b470b65adcca288615ad3b5e3e06; version=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <4b6b06a8b12bfd95f9015074b1430c1480908073; version=b41f8638b9d30fbe045b4ef83ff4136c56a57397 <bb1703949dcaa9a49c338dee075f659f4634214d

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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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