CVE-2023-4155

CVE Details

Release Date:	2023-08-04
Impact:	Moderate	What is this?

Description

A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the `VMGEXIT` handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (`CONFIG_VMAP_STACK`).

See more information about CVE-2023-4155 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	5.3
Vector String:	CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
Version:	3.0
Attack Vector:	Local
Attack Complexity:	High
Privileges Required:	High
User Interaction:	None
Scope:	Changed
Confidentiality Impact:	None
Integrity Impact:	None
Availability Impact:	High

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