CVE-2026-46032KVM: nSVM: Triple fault if restore host CR3 fails on nested #VMEXIT
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from d82aaef9c88aa27bce63751d6d6329920b1fe8da before b0eb0a8959ac2b808eb11548d002fe1f9b5650cc; from d82aaef9c88aa27bce63751d6d6329920b1fe8da before 9a738cf170a4a2332ea3a15e23ec65b5757fe4a1; from d82aaef9c88aa27bce63751d6d6329920b1fe8da before 5d291ef0585ed880ed4dd71ea1a5965e0a65fb53 | CNA record |
linux linux_kernel linux:linux_kernel | from 5.9 before 7.0.4 | NVD |
References
- https://git.kernel.org/stable/c/b0eb0a8959ac2b808eb11548d002fe1f9b5650cc
- https://git.kernel.org/stable/c/9a738cf170a4a2332ea3a15e23ec65b5757fe4a1patch
- https://git.kernel.org/stable/c/5d291ef0585ed880ed4dd71ea1a5965e0a65fb53patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.