CVE-2026-46071

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().

Score

CVSS 3.1 5.5 Medium

Status

Undergoing Analysis - 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-05-27

Last modified

2026-10-21

Affected products

• Linux Kernel (Linux)

References

• https://git.kernel.org/stable/c/165b08d2d1346dce5ed43db65e10f3194b9ae2fe
• https://git.kernel.org/stable/c/11d347b7edf5093d69aca72317300798a32bfd6b
• https://git.kernel.org/stable/c/a3f0981a5a0e0bd51ad74cc7d9eed32294b24002
• https://git.kernel.org/stable/c/9efe23568806d1cd06f7d146f9b3037b8d585a9f
• https://git.kernel.org/stable/c/b53ab5167a81537777ac780bbd93d32613aa3bda