{"id":"UBUNTU-CVE-2021-29657","details":"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.","modified":"2026-02-04T02:52:34.866826Z","published":"2021-04-03T00:00:00Z","related":["USN-4948-1"],"upstream":["CVE-2021-29657"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-29657"},{"type":"REPORT","url":"https://git.kernel.org/linus/a58d9166a756a0f4a6618e4f593232593d6df134"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4948-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-29657"}],"affected":[{"package":{"name":"linux-hwe-edge","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/linux-hwe-edge@4.15.0-23.25~16.04.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"],"ecosystem_specific":{"binaries":[{"binary_name":"block-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"block-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"crypto-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"crypto-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"dasd-extra-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"dasd-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fat-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fat-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fb-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"firewire-core-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"floppy-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-core-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-core-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-secondary-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"fs-secondary-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"input-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"input-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"ipmi-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"ipmi-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"irda-modules-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"irda-modules-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"kernel-image-4.15.0-23-generic-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"kernel-image-4.15.0-23-generic-lpae-di","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-cloud-tools-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-cloud-tools-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-generic-lpae","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-headers-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-hwe-edge-cloud-tools-4.15.0-23","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-hwe-edge-tools-4.15.0-23","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-hwe-edge-udebs-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-hwe-edge-udebs-generic-lpae","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-4.15.0-23-generic-lpae","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-unsigned-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-image-unsigned-4.15.0-23-lowlatency","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-modules-4.15.0-23-generic","binary_version":"4.15.0-23.25~16.04.1"},{"binary_name":"linux-modules-4.15.0-23-gene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