CVEvulnerability

CVE-2023-4155

5.6 MEDIUM Published 2023-09-13 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2023-09-13
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.3 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
CVSS 3.1 ([email protected])
5.6 MEDIUM — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
Weaknesses
CWE-367

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`).

Affected configurations

• linux linux kernel • redhat enterprise linux 8.0 • redhat enterprise linux 9.0 • fedoraproject fedora 37 • fedoraproject fedora 38

Related

Weakness · CWE (1)

  • CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition weakness

References