CVE-2021-3656
8.8
Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Exploitability: 2.0 / Impact: 6.0
Source: NVD
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.
Affected (55)
Products: Linux: Linux Kernel · Fedoraproject: Fedora · Redhat: Software Collections, Enterprise Linux Desktop, Enterprise Linux For Ibm Z Systems, Enterprise Linux For Ibm Z Systems Eus, Enterprise Linux For Power Big Endian, Enterprise Linux For Power Little Endian, Enterprise Linux For Real Time, Enterprise Linux For Real Time For Nfv, Enterprise Linux For Real Time For Nfv Tus, Enterprise Linux For Real Time Tus, Enterprise Linux For Scientific Computing, Enterprise Linux Server, Enterprise Linux Server Aus, Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions, Enterprise Linux Server Tus, Enterprise Linux Server Update Services For Sap Solutions, Enterprise Linux Workstation, Openstack, 3scale Api Management, Codeready Linux Builder, Virtualization Host
Configuration A
| Vulnerable Software | Affected Versions |
|---|---|
| From 4.13 to 4.14.245 |
Configuration B
| Vulnerable Software | Affected Versions |
|---|---|
| Version 33 |
Configuration C
| Vulnerable Software | Affected Versions |
|---|---|
| All versions |
Configuration D
| Vulnerable Software | Affected Versions |
|---|---|
| Version 7.0 | |
| Version 7.0 | |
| Version 8.1 | |
| Version 7.0 | |
| Version 7.0 | |
| Version 7 | |
| Version 7 | |
| Version 8.2 | |
| Version 8.2 | |
| Version 7.0 | |
| Version 7.0 | |
| Version 7.6 | |
| Version 7.6 | |
| Version 7.6 | |
| Version 7.6 | |
| Version 7.0 | |
| Version 13 |
Configuration E
| Vulnerable Software | Affected Versions |
|---|---|
| Version 2.0 |
Configuration F
| Vulnerable Software | Affected Versions |
|---|---|
| All versions |
| Running on/with | Platform Versions |
|---|---|
Redhat Enterprise Linux Eus | Version 8.1 |
Redhat Enterprise Linux For Power Little Endian | Version 8.0 |
Redhat Enterprise Linux For Power Little Endian Eus | Version 8.1 |
Configuration G
| Vulnerable Software | Affected Versions |
|---|---|
| Version 4.0 |
| Running on/with | Platform Versions |
|---|---|
Redhat Enterprise Linux | Version 7.0 |
References (8)
Source: secalert@redhat.com
Issue TrackingThird Party Advisory
Source: secalert@redhat.com
PatchThird Party Advisory
Source: secalert@redhat.com
PatchThird Party Advisory
Source: secalert@redhat.com
Mailing ListThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Issue TrackingThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
PatchThird Party Advisory
Source: af854a3a-2127-422b-91ae-364da2661108
Mailing ListThird Party Advisory
Timeline
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