Description
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.
Related CPE's
o
linux
linux_kernel
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fedoraproject
fedora
o
redhat
enterprise_linux_server
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redhat
enterprise_linux
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redhat
enterprise_linux_eus
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redhat
enterprise_linux_for_ibm_z_systems
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redhat
enterprise_linux_for_ibm_z_systems_eus
o
redhat
enterprise_linux_for_power_little_endian
o
redhat
enterprise_linux_for_power_little_endian_eus
o
redhat
enterprise_linux_for_real_time
o
redhat
enterprise_linux_for_real_time_for_nfv
o
redhat
enterprise_linux_for_real_time_for_nfv_tus
o
redhat
enterprise_linux_for_real_time_tus
o
redhat
enterprise_linux_server_aus
o
redhat
enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions
o
redhat
enterprise_linux_server_tus
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redhat
enterprise_linux_server_update_services_for_sap_solutions
References
https://bugzilla.redhat.com/show_bug.cgi?id=1983988
https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc
https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc
https://www.openwall.com/lists/oss-security/2021/08/16/1
CVSS impact metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
8.8 · High
CVSS V3.1
CVSS V3.0
CVSS V2.0
Information
Source identifier
Vulnerability status
Analyzed
Published
2022-03-04T19:15:08.677
3 years agoLast modified
2023-01-19T15:53:14.633
2 years ago