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Linux Kernel: KVM Security Flaw in Virtual Machine Control
DEBIAN-CVE-2026-46071
Summary
A security flaw was found in the way the Linux kernel handles virtual machine control. This could potentially allow an attacker to manipulate the kernel's behavior. The issue has been resolved, and users should ensure they have the latest kernel updates to stay protected.
What to do
- Update debian linux to version 7.0.4-1.
Affected software
| Ecosystem | Vendor | Product | Affected versions |
|---|---|---|---|
| Debian:12 | debian | linux | All versions |
| Debian:13 | debian | linux | All versions |
| Debian:14 | debian | linux |
< 7.0.4-1 Fix: upgrade to 7.0.4-1
|
Original title
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, nest...
Original 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().
- https://security-tracker.debian.org/tracker/CVE-2026-46071 Vendor Advisory
Published: 27 May 2026 · Updated: 11 Jun 2026 · First seen: 11 Jun 2026