# CVE-2026-46032: KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT

CVE-2026-46032 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-46032, released May 27, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-46032
- Priority: High
- CVSS: 7.0 (Moderate)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 27, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-46032

## Description

In the Linux kernel, the following vulnerability has been resolved:  KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT  If loading L1's CR3 fails on a nested #VMEXIT, nested_svm_vmexit() returns an error code that is ignored by most callers, and continues to run L1 with corrupted state. A sane recovery is not possible in this case, and HW behavior is to cause a shutdown. Inject a triple fault instead, and do not return early from nested_svm_vmexit(). Continue cleaning up the vCPU state (e.g. clear pending exceptions), to handle the failure as gracefully as possible.  From the APM:    Upon #VMEXIT, the processor performs the following actions in order to   return to the host execution context:    ...    if (illegal host state loaded, or exception while loading host state)       shutdown   else       execute first host instruction following the VMRUN  Remove the return value of nested_svm_vmexit(), which is mostly unchecked anyway.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-46032](https://patchblox.com/security/data/fix/linux/debian-cve-2026-46032.md) | May 27, 2026 |
| Linux | linux Debian 14 | 7.0.4-1 | [DEBIAN-CVE-2026-46032](https://patchblox.com/security/data/fix/linux/debian-cve-2026-46032.md) | May 27, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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