CVE-2021-4093

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

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Configuration 2 (hide)

cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*

Configuration 3 (hide)

cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*

Configuration 4 (hide)

OR cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:21.10:*:*:*:*:*:*:*

Information

Published : 2022-02-18 10:15

Updated : 2023-01-19 07:53


NVD link : CVE-2021-4093

Mitre link : CVE-2021-4093


JSON object : View

CWE
CWE-125

Out-of-bounds Read

CWE-787

Out-of-bounds Write

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Products Affected

redhat

  • enterprise_linux

canonical

  • ubuntu_linux

fedoraproject

  • fedora

linux

  • linux_kernel