CVE-2021-29657
High
Description
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.
SeverityHigh
CVSS7.4
Exploit probability—
Product
Linux Kernel
PublishedJul 22, 2021
First seenJul 22, 2021
How to fix
Update
- linux linux_kernel5.10.28, 5.11.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 5.10 ≤ v < 5.10.28, 5.11 ≤ v < 5.11.12 | 5.10.28, 5.11.12 |
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