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CVE-2026-64562— KVM: nVMX: Hide shadow VMCS right after VMCLEAR

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.9版本存在安全漏洞，该漏洞源于KVM nVMX在VMCLEAR后未及时隐藏shadow VMCS，free_nested()释放shadow VMCS时vmcs01仍指向该内存，由于与loaded_vmcs_clear()异步，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< b82c3144d8264265448292ca406f60bafeba3b6f affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< 4f50e6aec16f69627dbad5704d1e90a255d766a7 affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< dc3eecfa219ebc9d01eaf7d1abd1441efe884dab affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< af56298e9d86e6098cd1d2e155cb2949b7c45412 affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< 589419470030a89f16cf19300658b6dc644ca946 affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< 8001d2ce9d9bd09118ce523aef595aa094573ae3 affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< 1dabef6e206568bf9d9ade74f6e56a48ea35695d affected
355f4fb1405ec29d0fac49b4d41fcd78cbd455d5< 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3 affected
… +10 more rows
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I. Basic Information for CVE-2026-64562

Vulnerability Information
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Vulnerability Title
KVM: nVMX: Hide shadow VMCS right after VMCLEAR
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR. The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.9版本存在安全漏洞，该漏洞源于KVM nVMX在VMCLEAR后未及时隐藏shadow VMCS，free_nested()释放shadow VMCS时vmcs01仍指向该内存，由于与loaded_vmcs_clear()异步，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5 ~ b82c3144d8264265448292ca406f60bafeba3b6f -
Linux Linux 4.9 -

II. Public POCs for CVE-2026-64562

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III. Intelligence Information for CVE-2026-64562

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Patches & Fixes for CVE-2026-64562 (6)

Same Patch Batch · Linux · 2026-08-04 · 5 CVEs total

CVE-2026-64564 9.8 CRITICAL sctp: don't free the ASCONF's own transport in DEL-IP processing
CVE-2026-64561 8.8 HIGH KVM: x86: Check for invalid/obsolete root *after* making MMU pages available
CVE-2026-64563 7.8 HIGH rhashtable: clear stale iter->p on table restart
CVE-2026-64565 Input: ims-pcu - fix heap-buffer-overflow in ims_pcu_process_data()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64562

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