CVE-2026-46131

Host service interrupt via invalid nested translation

Published May 28, 2026 · Updated May 28, 2026

Denial of service in Linux Kernel KVM allows local users to interrupt host service via a slow Hyper-V TLB flush hypercall. The kvm_hv_flush_tlb() path checks only guest mode, then calls translate_nested_gpa() even when the L2 guest lacks nested EPT/NPT, for which that translation routine is invalid. The path is reachable only from an L2 guest running without nested EPT/NPT; the published impact is limited to host availability.

CVSS severity5.5
Medium
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

Denial of service in Linux Kernel KVM allows local users to interrupt host service via a slow Hyper-V TLB flush hypercall. The kvm_hv_flush_tlb() path checks only guest mode, then calls translate_nested_gpa() even when the L2 guest lacks nested EPT/NPT, for which that translation routine is invalid. The path is reachable only from an L2 guest running without nested EPT/NPT; the published impact is limited to host availability.

The record

CVE
CVE-2026-46131
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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=6.2
  2. Affected versionversion=aee738236dca0d0870789138ec494e15d6303566 <45fc766bc756ff1d66f8ca026a9c4f7f764adfae
  3. Affected versionversion=aee738236dca0d0870789138ec494e15d6303566 <464af6fc2b1dcc74005b7f58ee3812b17777efee
  4. Affected versionversion=aee738236dca0d0870789138ec494e15d6303566 <4c7f8436b19a2a3acc0cb6b6e3becd6796ae5c57
  5. Affected versionversion=aee738236dca0d0870789138ec494e15d6303566 <971f17f5d91045404e3914029ea57c3da90179a4
  6. Affected versionversion=aee738236dca0d0870789138ec494e15d6303566 <d6f4e217d663ede5becc2fd6cb612c749677387b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=aee738236dca0d0870789138ec494e15d6303566 <45fc766bc756ff1d66f8ca026a9c4f7f764adfae; version=aee738236dca0d0870789138ec494e15d6303566 <464af6fc2b1dcc74005b7f58ee3812b17777efee; version=aee738236dca0d0870789138ec494e15d6303566 <4c7f8436b19a2a3acc0cb6b6e3becd6796ae5c57; version=aee738236dca0d0870789138ec494e15d6303566 <971f17f5d91045404e3914029ea57c3da90179a4; version=aee738236dca0d0870789138ec494e15d6303566 <d6f4e217d663ede5becc2fd6cb612c749677387b

Published CVSS scores

5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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