Vulnerability Report

CVE-2021-4093

Title: Redhat Enterprise Linux Memory Corruption

Memory Corruption

Proof Of Concept

No public PoC currently indexed for CVE-2021-4093.

CWE Category CWE-125
Published Date Feb 18, 2022
Modified Date Nov 21, 2024
Exploit Status Not Found
Score 8.8 CVSS v3.1
Exploit Probability (EPSS)
0.42%

Vulnerability Summary

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.

Impacted Vendors

C
canonical 1
F
fedoraproject 1
L
linux 1
R
redhat 2
U
ubuntu 2

Reference Links

https://bugs.chromium.org/p/project-zero/issues/detail?id=2222 https://bugzilla.redhat.com/show_bug.cgi?id=2028584 https://bugs.chromium.org/p/project-zero/issues/detail?id=2222 https://bugzilla.redhat.com/show_bug.cgi?id=2028584
CVSS v3.1
Source Entity [email protected]
Severity HIGH
8.8
Attack Vector
LOCAL
Complexity
LOW
Privileges
N/A
Interaction
NONE
Confidentiality
N/A
Integrity
N/A
Availability
N/A
Scope
CHANGED
RAW VECTOR CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS v2.0
Source Entity [email protected]
Severity HIGH
7.2
Access Vector
N/A
Authentication
N/A
RAW VECTOR AV:L/AC:L/Au:N/C:C/I:C/A:C

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2021-4093 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

MODIFIED

Vulnerability data or affected products updated.

PUBLISHED

Vulnerability first announced in NVD.

Attack Vector Matrix

Access Vector LOCAL
Complexity LOW
Privileges N/A
Interaction NONE
CVSS Vector String CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected Stack

No specific products linked.