CVE-2023-4155

Sev-es / sev-snp vmgexit double fetch vulnerability

At a glance

Severity
MEDIUM 5.3
EPSS
EPSS 0.17 % · percentile 6 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
redhat
NVD status
Modified

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`).

Scores

VersionScoreVectorScored by
CVSS 3.1MEDIUM 5.3CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:Hredhat
CVSS 3.1MEDIUM 5.3CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:HNVD · secalert@redhat.com (Secondary)
CVSS 3.1MEDIUM 5.6CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:HNVD · nvd@nist.gov (Primary)

Weaknesses (CWE)

European references

CERT-FR advisories

Affected configurations (NVD CPE)

Affected products

ProductVersions
kernel
Red Hat · Red Hat Enterprise Linux 6
Red Hat · Red Hat Enterprise Linux 7
Red Hat · Red Hat Enterprise Linux 7
Red Hat · Red Hat Enterprise Linux 8
Red Hat · Red Hat Enterprise Linux 8
Red Hat · Red Hat Enterprise Linux 9
Red Hat · Red Hat Enterprise Linux 9
Fedora · Fedora

References

Sources

SourceLicence
CVE List (CVEProject cvelistV5)CVE Program Terms of Use
EPSS (FIRST.org)FIRST — attribution requested
ENISA EUVDENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feedsPublic domain — this product uses data from the NVD API but is not endorsed or certified by the NVD