CVE-2026-46071 Details
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().
A vulnerability exists in the Linux kernel's handling of nested SVM virtualization, specifically related to the VMCB LBR (Last Branch Record) management. The issue arises because the function 'svm_copy_lbrs()' incorrectly marks the VMCB LBR as dirty in the destination VMCB. This flaw is problematic because 'nested_svm_vmexit()' relies on this function to copy LBRs to 'vmcb12', and clearing clean bits in 'vmcb12' is not defined by the architecture. The vulnerability affects the Linux kernel's stable releases.
Users can upgrade to the latest stable version of the Linux kernel, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.
| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f | kernel.org | Patch |
| https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002 | kernel.org | Patch |
| https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| NVD-CWE-noinfo | Insufficient Information to Classify Weakness | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 5.19, < 6.18.27 >= 6.19, < 7.0.4 |
CPE
Remediation
| |
Change History
3 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 24, 2026 | Initial Analysis | [email protected] |
| Jun 17, 2026 | CVE Modified | kernel.org |
| May 27, 2026 | New CVE Received | kernel.org |