Sev-es / sev-snp vmgexit double fetch vulnerability
Published Sep 13, 2023
5.6
MEDIUMCVSS 3.1
EPSS 0.17%
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 products
-
-
-
- Vendor n/a Product Kernel Defaultaffected
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||
|---|---|---|---|---|---|---|
| Fedora | Fedora | affected |
| |||
| Red Hat | Red Hat Enterprise Linux 8 | affected |
| |||
| Red Hat | Red Hat Enterprise Linux 9 | affected |
| |||
| n/a | Kernel | affected |
|
Configuration 1
- n/a
Configuration 2
- 8.0
- 9.0
Configuration 3
- 37
- 38
No data.
Red Hat Enterprise Linux 8
kernel-0:4.18.0-513.5.1.el8_9
Fixed · RHSA-2023:7077
Red Hat Enterprise Linux 8
kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9
Fixed · RHSA-2023:6901
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
kernel-0:4.18.0-372.107.1.el8_6
Fixed · RHSA-2024:3859
Red Hat Enterprise Linux 8.6 Telecommunications Update Service
kernel-0:4.18.0-372.107.1.el8_6
Fixed · RHSA-2024:3859
Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions
kernel-0:4.18.0-372.107.1.el8_6
Fixed · RHSA-2024:3859
Red Hat Enterprise Linux 8.8 Extended Update Support
kernel-0:4.18.0-477.64.1.el8_8
Fixed · RHSA-2024:4740
Red Hat Enterprise Linux 9
kernel-0:5.14.0-362.8.1.el9_3
Fixed · RHSA-2023:6583
Red Hat Enterprise Linux 9
kernel-0:5.14.0-362.8.1.el9_3
Fixed · RHSA-2023:6583
Red Hat Enterprise Linux 6
kernel
Not affected
Red Hat Enterprise Linux 7
kernel
Not affected
Red Hat Enterprise Linux 7
kernel-rt
Not affected
Red Hat Enterprise Linux 9
kernel-rt
Affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 8 | kernel-0:4.18.0-513.5.1.el8_9 | Fixed | RHSA-2023:7077 |
| Red Hat Enterprise Linux 8 | kernel-rt-0:4.18.0-513.5.1.rt7.307.el8_9 | Fixed | RHSA-2023:6901 |
| Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support | kernel-0:4.18.0-372.107.1.el8_6 | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux 8.6 Telecommunications Update Service | kernel-0:4.18.0-372.107.1.el8_6 | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions | kernel-0:4.18.0-372.107.1.el8_6 | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux 8.8 Extended Update Support | kernel-0:4.18.0-477.64.1.el8_8 | Fixed | RHSA-2024:4740 |
| Red Hat Enterprise Linux 9 | kernel-0:5.14.0-362.8.1.el9_3 | Fixed | RHSA-2023:6583 |
| Red Hat Enterprise Linux 9 | kernel-0:5.14.0-362.8.1.el9_3 | Fixed | RHSA-2023:6583 |
| Red Hat Enterprise Linux 6 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel | Not affected | n/a |
| Red Hat Enterprise Linux 7 | kernel-rt | Not affected | n/a |
| Red Hat Enterprise Linux 9 | kernel-rt | Affected | n/a |
No package ranges for this CVE.
Remediation
Red Hat statement
Red Hat Enterprise Linux 6 and 7 are not affected by this flaw, as they did not include support for KVM AMD Secure Encrypted Virtualization (SEV). Note: AMD SEV is currently provided as a Technology Preview in RHEL 8, therefore, it is unsupported for production use. For additional details see https://access.redhat.com/articles/4491591 and https://access.redhat.com/support/offerings/techpreview.
Metrics
No CVSS v4.0 score for this CVE.
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H
1 other source (Red Hat) ▾
CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:N/I:N/A:H
No CVSS v3.0 score for this CVE.
No CVSS v2.0 score for this CVE.
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
NoTechnical Impact
PartialDecision
n/aAssessed Feb 26, 2025 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
Score over time
2023–2026- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (7 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.17% (0.00169) | 5.62th | v5 (v2026.06.15) |
| Jun 15, 2026 | 0.16% (0.00158) | 5.30th | v5 (v2026.06.15) |
| Mar 17, 2025 | 0.03% (0.00026) | 4.28th | v4 (v2025.03.14) |
| Dec 12, 2024 | 0.04% (0.00043) | 10.81th | v3 (v2023.03.01) |
| Jul 10, 2024 | 0.04% (0.00043) | 9.24th | v3 (v2023.03.01) |
| Sep 20, 2023 | 0.04% (0.00043) | 7.20th | v3 (v2023.03.01) |
| Sep 14, 2023 | 0.06% (0.00061) | 23.79th | v3 (v2023.03.01) |
References (4)
- https://access.redhat.com/security/cve/CVE-2023-4155 vdb-entryx_refsource_REDHATThird Party AdvisoryVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2213802 issue-trackingx_refsource_REDHATIssue TrackingPatchThird Party Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2023-4155
- https://www.cve.org/CVERecord?id=CVE-2023-4155
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2023-4155 | vdb-entryx_refsource_REDHATThird Party AdvisoryVendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2213802 | issue-trackingx_refsource_REDHATIssue TrackingPatchThird Party Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2023-4155 | ||
| https://www.cve.org/CVERecord?id=CVE-2023-4155 |
Change history (0)
No recorded changes yet.