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CVE-2021-29657

Published: Jul 22, 2021

Modified: Aug 3, 2024

PUBLISHED

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.

Vendor	Product	Versions
n/a	n/a	affected `n/a`

References

http://packetstormsecurity.com/files/163324/KVM-nested_svm_vmrun-Double-Fetch.html

x_refsource_MISC

https://bugs.chromium.org/p/project-zero/issues/detail?id=2177

x_refsource_MISC

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a58d9166a756a0f4a6618e4f593232593d6df134

x_refsource_CONFIRM

https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.11.12

x_refsource_CONFIRM

https://security.netapp.com/advisory/ntap-20210902-0008/

x_refsource_CONFIRM

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