CVE-2026-43483

Guest crash via dangling CR8 interception

Published May 13, 2026 · Updated May 13, 2026

Improper state management in Linux Kernel KVM SVM allows local users to crash Windows guests when AVIC is active. The AVIC activation path leaves CR8 write interception enabled, allowing the hardware TPR and KVM's LAPIC state to diverge. The failure is limited to AMD SVM hosts with AVIC and becomes fatal to Windows guests when the separate TPR synchronization flaw is also present.

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

Improper state management in Linux Kernel KVM SVM allows local users to crash Windows guests when AVIC is active. The AVIC activation path leaves CR8 write interception enabled, allowing the hardware TPR and KVM's LAPIC state to diverge. The failure is limited to AMD SVM hosts with AVIC and becomes fatal to Windows guests when the separate TPR synchronization flaw is also present.

The record

CVE
CVE-2026-43483
Published
May 13, 2026
Updated
May 13, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 13, 2026CVE publishedPublication date reported by the CVE source.
  2. May 13, 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=3bbf3565f48ce3999b5a12cde946f81bd4475312 <01651e7751edbbc0fb4598f8367a3dabcfc8c182
  2. Affected versionversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <737410b32bd615b321da4fbeda490351b9af5e8b
  3. Affected versionversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <816fa1dfae4532e851b1fe6b2434c753ecbd86c7
  4. Affected versionversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <87d0f901a9bd8ae6be57249c737f20ac0cace93d
  5. Affected versionversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <a4123fe5d9122eef9852e4921f7cc463420f30d4
  6. Affected versionversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <ba3bca40f9f25c053f69413e5f4a41dd0fd762bf
  7. Affected versionversion=4.7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3bbf3565f48ce3999b5a12cde946f81bd4475312 <01651e7751edbbc0fb4598f8367a3dabcfc8c182; version=3bbf3565f48ce3999b5a12cde946f81bd4475312 <737410b32bd615b321da4fbeda490351b9af5e8b; version=3bbf3565f48ce3999b5a12cde946f81bd4475312 <816fa1dfae4532e851b1fe6b2434c753ecbd86c7; version=3bbf3565f48ce3999b5a12cde946f81bd4475312 <87d0f901a9bd8ae6be57249c737f20ac0cace93d; version=3bbf3565f48ce3999b5a12cde946f81bd4475312 <a4123fe5d9122eef9852e4921f7cc463420f30d4; version=3bbf3565f48ce3999b5a12cde946f81bd4475312 <ba3bca40f9f25c053f69413e5f4a41dd0fd762bf; version=4.7

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.

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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

T1499.004Application 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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