Ubuntu: USN-4948-1 (CVE-2021-29657): Linux kernel (OEM) vulnerabilities
7
(AV:L/AC:M/Au:N/C:C/I:C/A:C)
05/11/2021
05/14/2021
05/12/2021
03/22/2023
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.
Solution(s)
- ubuntu-upgrade-linux-image-5-10-0-1026-oem
- ubuntu-upgrade-linux-image-oem-20-04b
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