CVE-2021-29657

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…

published July 22, 2021

CVSS
—
EPSS
0%
Percentile
34.8
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS
Not scored
CVSS v4.0
Not supplied
EPSS
0.00416 · 34.8th percentile
Published
2021-07-22T16:44Z
EPSS history
Timeline
  • 22 JUL 16:44Z
    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…
    cvelistv5