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CVE-2021-4093

CVSS v3.1 8.8 (High)
88% Progress
CVSS v2.0 7.2 (High)
72% Progress
EPSS 0.04 % (5th)
0.04% Progress
Affected Products 4
Advisories 3
Info CVSS EPSS CAPEC Affected Configurations References Security Advisories Packages & Software OVAL Tools, Exploits & PoC Graph Web & Social Timeline

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.

Weaknesses
CWE-125
Out-of-bounds Read
CWE-787
Out-of-bounds Write
CVE Status
PUBLISHED
CNA
Red Hat, Inc.
Published Date
2022-02-18 18:15:10
(2 years ago)
Updated Date
2023-11-07 03:40:10
(10 months ago)

Affected Products

Canonical

Fedoraproject

Linux

Redhat

Configuration #1

    CPE23 From Up To
  Linux Kernel from 5.11 version and prior 5.14.16 version cpe:2.3:o:linux:linux_kernel >= 5.11 < 5.14.16

Configuration #2

    CPE23 From Up To
  Redhat Enterprise Linux 8.0 cpe:2.3:o:redhat:enterprise_linux:8.0

Configuration #3

    CPE23 From Up To
  Fedoraproject Fedora 35 cpe:2.3:o:fedoraproject:fedora:35

Configuration #4

    CPE23 From Up To
  Canonical Ubuntu Linux 20.04 cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts
  Canonical Ubuntu Linux 21.10 cpe:2.3:o:canonical:ubuntu_linux:21.10