CVE-2026-53345

Kernel panic via false teardown warning

Published Jul 1, 2026 · Updated Jul 1, 2026

Denial of service in Linux Kernel KVM allows local users to trigger a kernel panic during teardown of an x86 SEV-ES virtual machine. The mark_page_dirty_in_slot() path treats a guest page dirtied without a loaded vCPU as invalid and raises WARN_ON_ONCE after the VM users_count reaches zero. The user must control an SEV-ES VM, leave the page mapped by skipping the next KVM_RUN, and encounter a host configured with panic_on_warn for a host-wide crash.

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 KVM allows local users to trigger a kernel panic during teardown of an x86 SEV-ES virtual machine. The mark_page_dirty_in_slot() path treats a guest page dirtied without a loaded vCPU as invalid and raises WARN_ON_ONCE after the VM users_count reaches zero. The user must control an SEV-ES VM, leave the page mapped by skipping the next KVM_RUN, and encounter a host configured with panic_on_warn for a host-wide crash.

The record

CVE
CVE-2026-53345
Published
Jul 1, 2026
Updated
Jul 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 1, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 1, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <6.12.94
  2. Affected versionversion=0 <6.18.36
  3. Affected versionversion=0 <6.6.143
  4. Affected versionversion=0 <7.0.13
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <033d39e41fc30f484f4e4f37fb4cd76b12cbb18e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <343e95c8ecc40e0738975ef4ee24c0c35e800e6b
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <66a8e7ddd901023c89a2733494d827eca3f9c1b0
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8618004d3e897c0f1b71d9a9ab860461289bb89a
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <99d7d43784ae3235026581e9bf892c036e04c8e6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=0 <6.12.94; version=0 <6.18.36; version=0 <6.6.143; version=0 <7.0.13; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <033d39e41fc30f484f4e4f37fb4cd76b12cbb18e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <343e95c8ecc40e0738975ef4ee24c0c35e800e6b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <66a8e7ddd901023c89a2733494d827eca3f9c1b0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8618004d3e897c0f1b71d9a9ab860461289bb89a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <99d7d43784ae3235026581e9bf892c036e04c8e6

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

CWE-401Missing Release of Memory after Effective Lifetime
T1499Endpoint Denial of Service

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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