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This vulnerability has been modified since it was last analyzed by the NVD. It is awaiting reanalysis which may result in further changes to the information provided.
Description
The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.
Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.
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Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could access (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS.
The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
CVE Modified by Red Hat, Inc.2/02/2023 11:18:01 AM
Action
Type
Old Value
New Value
Added
CVSS V2
Red Hat, Inc. (AV:A/AC:H/Au:S/C:N/I:N/A:C)
Added
CVSS V3
Red Hat, Inc. AV:A/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Changed
Description
The prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
Linux kernel built with the KVM visualization support (CONFIG_KVM), with nested visualization (nVMX) feature enabled (nested=1), is vulnerable to a crash due to disabled external interrupts. As L2 guest could access (r/w) hardware CR8 register of the host(L0). In a nested visualization setup, L2 guest user could use this flaw to potentially crash the host(L0) resulting in DoS.
OR
*cpe:2.3:o:linux:linux_kernel:4.13.3:*:*:*:*:*:*:* (and previous)
Added
CVSS V2
(AV:L/AC:L/Au:N/C:P/I:P/A:N)
Added
CVSS V3
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Added
CWE
CWE-284
Changed
Reference Type
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51aa68e7d57e3217192d88ce90fd5b8ef29ec94f No Types Assigned
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=51aa68e7d57e3217192d88ce90fd5b8ef29ec94f Issue Tracking, Patch, Third Party Advisory
Changed
Reference Type
http://www.securityfocus.com/bid/100856 No Types Assigned
http://www.securityfocus.com/bid/100856 Third Party Advisory, VDB Entry
Changed
Reference Type
https://bugzilla.redhat.com/show_bug.cgi?id=1491224 No Types Assigned
https://bugzilla.redhat.com/show_bug.cgi?id=1491224 Issue Tracking, Patch, Third Party Advisory
Changed
Reference Type
https://github.com/torvalds/linux/commit/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f No Types Assigned
https://github.com/torvalds/linux/commit/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f Issue Tracking, Patch, Third Party Advisory
Changed
Reference Type
https://www.spinics.net/lists/kvm/msg155414.html No Types Assigned
https://www.spinics.net/lists/kvm/msg155414.html Mailing List, Patch, Third Party Advisory
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