CVE-2026-53359Known exploitationPublic exploit

Guest-to-host escape via shadow-page role confusion

Published Jul 4, 2026 · Updated Jul 4, 2026

Use-after-free in KVM/x86 shadow paging in affected Linux Kernel branches allows guest OS users to escape to the host. kvm_mmu_get_child_sp() reuses a shadow page after matching only its GFN, not its role; cleanup then computes the wrong GFN and leaves an rmap entry pointing into a freed page. Guest root and exposed nested virtualization can drive the mapping changes and later rmap walk, enabling a host-kernel panic or root code execution.

CVSS severity8.6
High
EPSS probability0.96%
Next 30 days · Sep 16, 2026
Known exploitationReported
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in KVM/x86 shadow paging in affected Linux Kernel branches allows guest OS users to escape to the host. kvm_mmu_get_child_sp() reuses a shadow page after matching only its GFN, not its role; cleanup then computes the wrong GFN and leaves an rmap entry pointing into a freed page. Guest root and exposed nested virtualization can drive the mapping changes and later rmap walk, enabling a host-kernel panic or root code execution.

The record

CVE
CVE-2026-53359
Published
Jul 4, 2026
Updated
Jul 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1611
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jul 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 4, 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=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <1ae7d5a6db6c190ce183e3098ca0e0846e14d462
  2. Affected versionversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <2ad3afa40ac6aa340dada122f9abfa46c0a6eb35
  3. Affected versionversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <5e470998a23e4c3d89ed24e8172cb22747e61efa
  4. Affected versionversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb
  5. Affected versionversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <9291654d69e08542de37755cebe4d5b02c3170d1
  6. Affected versionversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <b1337aae5e194324e4810d561764e7793f8b3864
  7. Affected versionversion=2.6.36

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <1ae7d5a6db6c190ce183e3098ca0e0846e14d462; version=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <2ad3afa40ac6aa340dada122f9abfa46c0a6eb35; version=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <5e470998a23e4c3d89ed24e8172cb22747e61efa; version=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <81ccda30b4e83d8f5cc4fd50503c44e3a33abfeb; version=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <9291654d69e08542de37755cebe4d5b02c3170d1; version=2032a93d66fa282ba0f2ea9152eeff9511fa9a96 <b1337aae5e194324e4810d561764e7793f8b3864; version=2.6.36

Published CVSS scores

8.6Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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
Privilegesadmin
Known exploitationReported
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1611Escape to Host

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Reported exploitation

Technologies

Your stack

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Your stack

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