arch/x86/kvm/svm/nested.c in the Linux kernel before 5.11.12 has a use-after-free in which an AMD KVM guest can bypass access control on host OS MSRs when there are nested guests, aka CID-a58d9166a756. This occurs because of a TOCTOU race condition associated with a VMCB12 double fetch in nested_svm_vmrun.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade linux | Jul 30, 2024 | Jul 22, 2021 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Jul 22, 2021 |
| Ubuntu | — | Upgrade linux-image-oem-20.04bUpgrade linux-image-5.10.0-1026-oem | May 12, 2021 | May 11, 2021 |
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