8.8

CVE-2021-4093

Exploit

A flaw was found in the KVM's AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.

Data is provided by the National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.11 < 5.14.16
Redhat ≫ Enterprise Linux Version8.0
Fedoraproject ≫ Fedora Version35
Canonical ≫ Ubuntu Linux Version20.04 SwEditionlts
Canonical ≫ Ubuntu Linux Version21.10
Zu dieser CVE wurde keine CISA KEV oder CERT.AT-Warnung gefunden.
EPSS Metriken
Type Source Score Percentile
EPSS FIRST.org 0.09% 0.267
CVSS Metriken
Source Base Score Exploit Score Impact Score Vector string
nvd@nist.gov 8.8 2 6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
nvd@nist.gov 7.2 3.9 10
AV:L/AC:L/Au:N/C:C/I:C/A:C
CWE-125 Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

CWE-787 Out-of-bounds Write

The product writes data past the end, or before the beginning, of the intended buffer.

https://bugs.chromium.org/p/project-zero/issues/detail?id=2222
Patch
Third Party Advisory
Exploit
Mailing List
https://bugzilla.redhat.com/show_bug.cgi?id=2028584
Patch
Third Party Advisory
Issue Tracking