8.8

CVE-2021-3653

Exploit
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 "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) 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. This flaw affects Linux kernel versions prior to 5.14-rc7.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 2.6.30 < 4.4.282
Linux ≫ Linux Kernel Version >= 4.5 < 4.9.281
Linux ≫ Linux Kernel Version >= 4.10 < 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 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
Redhat ≫ Enterprise Linux Version 7.0
Debian ≫ Debian Linux Version 9.0
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.44% 0.362
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 6.1 3.9 8.5
AV:L/AC:L/Au:N/C:P/I:P/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://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
Third Party Advisory
Mailing List
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
Third Party Advisory
Mailing List
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
Third Party Advisory
Exploit
VDB Entry
https://bugzilla.redhat.com/show_bug.cgi?id=1983686
Patch
Third Party Advisory
Issue Tracking
https://www.openwall.com/lists/oss-security/2021/08/16/1
Patch
Third Party Advisory
Mailing List