CVE-2026-46032

Guest shutdown via ignored CR3 restore failure

Published May 27, 2026 · Updated May 27, 2026

Denial of service in Linux Kernel 5.9 through 7.0.3 allows guest OS users to shut down a KVM guest during nested VM exit. The nested_svm_vmexit() path returns after a failed L1 CR3 restore, but callers ignore the error and resume L1 with corrupted vCPU state. An L1 guest able to run nested SVM and supply an invalid host CR3 can force its own shutdown; host confidentiality and integrity are unaffected.

CVSS severity5.5
Medium
EPSS probability0.12%
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 5.9 through 7.0.3 allows guest OS users to shut down a KVM guest during nested VM exit. The nested_svm_vmexit() path returns after a failed L1 CR3 restore, but callers ignore the error and resume L1 with corrupted vCPU state. An L1 guest able to run nested SVM and supply an invalid host CR3 can force its own shutdown; host confidentiality and integrity are unaffected.

The record

CVE
CVE-2026-46032
Published
May 27, 2026
Updated
May 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 27, 2026CVE publishedPublication date reported by the CVE source.
  2. May 27, 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=5.9
  2. Affected versionversion=d82aaef9c88aa27bce63751d6d6329920b1fe8da <5d291ef0585ed880ed4dd71ea1a5965e0a65fb53
  3. Affected versionversion=d82aaef9c88aa27bce63751d6d6329920b1fe8da <9a738cf170a4a2332ea3a15e23ec65b5757fe4a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.9; version=d82aaef9c88aa27bce63751d6d6329920b1fe8da <5d291ef0585ed880ed4dd71ea1a5965e0a65fb53; version=d82aaef9c88aa27bce63751d6d6329920b1fe8da <9a738cf170a4a2332ea3a15e23ec65b5757fe4a1

Published CVSS scores

5.5NVDCVSS: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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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