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CVE-2026-68081— KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state

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 5.2版本存在安全漏洞，该漏洞源于未释放vmcs12页面，可能导致已固定页面或映射泄漏。

AI Predicted 3.1 Difficulty: Hard EPSS 0.15% · P4

Affected Version Matrix 8

VendorProduct Version RangeStatus
Linux Linux 96c66e87deeeb3cc78a3b82a1de8e365eec206c1< 7996013b85687034d2e820cef94d6404192e3a3d affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1< 2c87a087c20632d68920272173b5d7c47f9bcf70 affected
96c66e87deeeb3cc78a3b82a1de8e365eec206c1< 2f2312c422fd2695da772cecb30c69994b795964 affected
5.2 affected
< 5.2 unaffected
6.18.40≤ 6.18.* unaffected
7.1.5≤ 7.1.* unaffected
7.2≤ * unaffected
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I. Basic Information for CVE-2026-68081

Vulnerability Information
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Vulnerability Title
KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Put vmcs12 pages if nested VM-Enter fails due to invalid guest state Put all vmcs12 pages if KVM synthesizes a nested VM-Exit due to invalid guest while emulating VMLAUNCH or VMRESUME. The invalid guest state path doesn't use nested_vmx_vmexit() as that API is intended to be used if and only if L2 is active, and the open coded equivalent neglects to put the vmcs12 pages. Failure to put the vmcs12 pages leaks any pinned pages (and/or mappings) if L1 retries VMLAUNCH/VMRESUME. Note, the !from_vmenter scenario doesn't suffer the same problem, as vmx_get_nested_state_pages() only gets/pins/maps the vmcs12 pages if L2 is active, i.e. if a "full" VM-Exit is guaranteed before KVM will retry getting vmcs12 pages.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 5.2版本存在安全漏洞，该漏洞源于未释放vmcs12页面，可能导致已固定页面或映射泄漏。
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 96c66e87deeeb3cc78a3b82a1de8e365eec206c1 ~ 7996013b85687034d2e820cef94d6404192e3a3d -
Linux Linux 5.2 -

II. Public POCs for CVE-2026-68081

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III. Intelligence Information for CVE-2026-68081

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Patches & Fixes for CVE-2026-68081 (3)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-68081

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