8.8

CVE-2021-3656

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.13 < 4.14.245
Linux ≫ Linux Kernel Version >= 4.15 < 4.19.205
Linux ≫ Linux Kernel Version >= 4.20 < 5.4.142
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.60
Linux ≫ Linux Kernel Version >= 5.11 < 5.13.12
Linux ≫ Linux Kernel Version 5.14 Update -
Linux ≫ Linux Kernel Version 5.14 Update rc1
Linux ≫ Linux Kernel Version 5.14 Update rc2
Linux ≫ Linux Kernel Version 5.14 Update rc3
Linux ≫ Linux Kernel Version 5.14 Update rc4
Linux ≫ Linux Kernel Version 5.14 Update rc5
Linux ≫ Linux Kernel Version 5.14 Update rc6
Fedoraproject ≫ Fedora Version 33
Fedoraproject ≫ Fedora Version 34
Redhat ≫ Software Collections Version -
   Redhat ≫ Enterprise Linux Server Version 7.0
Redhat ≫ Openstack Version 13
Redhat ≫ Enterprise Linux Version 8.0
Redhat ≫ Enterprise Linux Eus Version 8.1
Redhat ≫ Enterprise Linux Eus Version 8.2
Redhat ≫ Enterprise Linux Eus Version 8.4
Redhat ≫ 3scale Api Management Version 2.0
   Redhat ≫ Enterprise Linux Version 7.0
   Redhat ≫ Enterprise Linux Version 8.0
Redhat ≫ Virtualization Host Version 4.0
   Redhat ≫ Enterprise Linux Version 7.0
   Redhat ≫ Enterprise Linux Version 8.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.66% 0.466
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
NIST 8.8 2 6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
NIST 7.2 3.9 10
AV:L/AC:L/Au:N/C:C/I:C/A:C
CWE-862 Missing Authorization

The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

https://www.openwall.com/lists/oss-security/2021/08/16/1
Third Party Advisory
Mailing List
https://bugzilla.redhat.com/show_bug.cgi?id=1983988
Third Party Advisory
Issue Tracking
https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc
Patch
Third Party Advisory
https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc
Patch
Third Party Advisory