CVE-2026-43315

Local kernel warning via inconsistent nSVM state

Published May 8, 2026 · Updated May 8, 2026

Improper state validation in affected Linux Kernel KVM releases allows local users to trigger a kernel warning through nested SVM state. svm_set_nested_state() permits CPUID to reduce the physical-address width after CR3 is loaded, causing nested_svm_load_cr3() to reject the restored value and reach WARN. The trigger requires local KVM access and nested SVM; it taints the kernel by default and causes a kernel panic when panic_on_warn is enabled.

CVSS severityUnavailable
Unscored
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

Improper state validation in affected Linux Kernel KVM releases allows local users to trigger a kernel warning through nested SVM state. svm_set_nested_state() permits CPUID to reduce the physical-address width after CR3 is loaded, causing nested_svm_load_cr3() to reject the restored value and reach WARN. The trigger requires local KVM access and nested SVM; it taints the kernel by default and causes a kernel panic when panic_on_warn is enabled.

The record

CVE
CVE-2026-43315
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 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=5.14
  2. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <155ec243ef726f4bc49536fa0bfb565dc011ab17
  3. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <580ea57840864d40e019bc13fd26afdc8d510a2f
  4. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <969e5e13ff5c18603f21d1f9f64ec9194e141ac0
  5. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <ce904c8a5bbe697eae0f7e34b07095bd7a6dee19
  6. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b
  7. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8
  8. Affected versionversion=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <fc3ba56385d03501eb582e4b86691ba378e556f9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <155ec243ef726f4bc49536fa0bfb565dc011ab17; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <580ea57840864d40e019bc13fd26afdc8d510a2f; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <969e5e13ff5c18603f21d1f9f64ec9194e141ac0; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <ce904c8a5bbe697eae0f7e34b07095bd7a6dee19; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <deb8f6dfd31d94b18dbeeaa8c01fbec5fc70fd2b; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <ebb2ab4f1c87d6b52776292cf7dc16aea48e95f8; version=b222b0b88162bdef4eceb12a79d5edbbdb23dbfd <fc3ba56385d03501eb582e4b86691ba378e556f9

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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.

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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