VULNERABILITY INTELLIGENCE

CVE-2023-4155

CVSS score5.3 MEDIUM
EPSS probability0.17%
CISA KEVNot currently listed
Published2023-09-13
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H

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`).

Weakness classification

  • secalert@redhat.com: CWE-367
  • nvd@nist.gov: CWE-367

Primary references