Sev-es / sev-snp vmgexit double fetch vulnerability
Priority LOW 24CWE-367Published · Updated
Key facts
- Attack vector
- Local
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 14 fixed, 1 without a fix
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and Red Hat.
Summary
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`).
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00165 5th percentileScored 2026-11-07
Fix Partial Red Hat: 5 advisoriesRed Hat: 14 fixed, 1 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | kernel | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 6 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 7 | — | — | Not affected | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 8 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | No fix listed | CNA |
| Red Hat | Red Hat Enterprise Linux 9 | — | — | No fix listed | CNA |
| Fedora | Fedora | — | — | No fix listed | CNA |
- kernel Vendor— Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 6 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 7 VendorRed Hat Affected — Fixed in — Not affected CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 8 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Red Hat Enterprise Linux 9 VendorRed Hat Affected — Fixed in — No fix listed CNA
- Fedora VendorFedora Affected — Fixed in — No fix listed CNA
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Linux |
| cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* | 8.0 | Vulnerable | Red Hat |
| cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* | 9.0 | Vulnerable | Red Hat |
| cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* | 37 | Vulnerable | Fedoraproject |
| cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* | 38 | Vulnerable | Fedoraproject |
- cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Linux
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* Versions 8.0 Vulnerable ·Red Hat
- cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:* Versions 9.0 Vulnerable ·Red Hat
- cpe:2.3:o:fedoraproject:fedora:37:*:*:*:*:*:*:* Versions 37 Vulnerable ·Fedoraproject
- cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:* Versions 38 Vulnerable ·Fedoraproject
Remediation
Red Hat 5 advisories
- RHSA-2024:4740 Released 2024-07-23 · Red Hat rating Moderatekernel security update
- Red Hat CodeReady Linux Builder EUS (v.8.8) kernel-tools-libs-devel-4.18.0-477.64.1.el8_8
- Red Hat Enterprise Linux BaseOS EUS (v.8.8) bpftool-4.18.0-477.64.1.el8_8, kernel-4.18.0-477.64.1.el8_8, kernel-abi-stablelists-4.18.0-477.64.1.el8_8 +19
- RHSA-2024:3859 Released 2024-06-12 · Red Hat rating Moderatekernel security update
- Red Hat Enterprise Linux BaseOS AUS (v.8.6) bpftool-4.18.0-372.107.1.el8_6, kernel-4.18.0-372.107.1.el8_6, kernel-abi-stablelists-4.18.0-372.107.1.el8_6 +14
- Red Hat Enterprise Linux BaseOS E4S (v.8.6) bpftool-4.18.0-372.107.1.el8_6, kernel-4.18.0-372.107.1.el8_6, kernel-abi-stablelists-4.18.0-372.107.1.el8_6 +19
- Red Hat Enterprise Linux BaseOS TUS (v.8.6) bpftool-4.18.0-372.107.1.el8_6, kernel-4.18.0-372.107.1.el8_6, kernel-abi-stablelists-4.18.0-372.107.1.el8_6 +14
- RHSA-2023:7077 Released 2023-11-14 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 8) kernel-tools-libs-devel-4.18.0-513.5.1.el8_9
- Red Hat Enterprise Linux BaseOS (v. 8) bpftool-4.18.0-513.5.1.el8_9, kernel-4.18.0-513.5.1.el8_9, kernel-abi-stablelists-4.18.0-513.5.1.el8_9 +19
Show 2 more Red Hat advisories
- RHSA-2023:6901 Released 2023-11-14 · Red Hat rating Importantkernel-rt security, bug fix, and enhancement update
- Red Hat Enterprise Linux Real Time (v. 8) kernel-rt-4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-core-4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-4.18.0-513.5.1.rt7.307.el8_9 +7
- Red Hat Enterprise Linux Real Time for NFV (v. 8) kernel-rt-4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-core-4.18.0-513.5.1.rt7.307.el8_9, kernel-rt-debug-4.18.0-513.5.1.rt7.307.el8_9 +9
- RHSA-2023:6583 Released 2023-11-07 · Red Hat rating Importantkernel security, bug fix, and enhancement update
- Red Hat CodeReady Linux Builder (v. 9) kernel-tools-libs-devel-5.14.0-362.8.1.el9_3, libperf-5.14.0-362.8.1.el9_3
- Red Hat Enterprise Linux AppStream (v. 9) kernel-64k-debug-devel-5.14.0-362.8.1.el9_3, kernel-64k-debug-devel-matched-5.14.0-362.8.1.el9_3, kernel-64k-devel-5.14.0-362.8.1.el9_3 +11
- Red Hat Enterprise Linux BaseOS (v. 9) bpftool-7.2.0-362.8.1.el9_3, kernel-5.14.0-362.8.1.el9_3, kernel-64k-5.14.0-362.8.1.el9_3 +29
- Red Hat Enterprise Linux Real Time (v. 9) kernel-rt-5.14.0-362.8.1.el9_3, kernel-rt-core-5.14.0-362.8.1.el9_3, kernel-rt-debug-5.14.0-362.8.1.el9_3 +9
- Red Hat Enterprise Linux Real Time for NFV (v. 9) kernel-rt-5.14.0-362.8.1.el9_3, kernel-rt-core-5.14.0-362.8.1.el9_3, kernel-rt-debug-5.14.0-362.8.1.el9_3 +11
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat CodeReady Linux Builder (v. 8) | Fixed | RHSA-2023:7077 |
| Red Hat CodeReady Linux Builder (v. 9) | Fixed | RHSA-2023:6583 |
| Red Hat CodeReady Linux Builder EUS (v.8.8) | Fixed | RHSA-2024:4740 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2023:6583 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | RHSA-2023:7077 |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2023:6583 |
| Red Hat Enterprise Linux BaseOS AUS (v.8.6) | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux BaseOS E4S (v.8.6) | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux BaseOS EUS (v.8.8) | Fixed | RHSA-2024:4740 |
| Red Hat Enterprise Linux BaseOS TUS (v.8.6) | Fixed | RHSA-2024:3859 |
| Red Hat Enterprise Linux Real Time (v. 8) | Fixed | RHSA-2023:6901 |
| Red Hat Enterprise Linux Real Time (v. 9) | Fixed | RHSA-2023:6583 |
| Red Hat Enterprise Linux Real Time for NFV (v. 8) | Fixed | RHSA-2023:6901 |
| Red Hat Enterprise Linux Real Time for NFV (v. 9) | Fixed | RHSA-2023:6583 |
Not affected: 2 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
Timeline
- 2026-10-02 Threatist record created from CVE-2023-4155
- 2026-10-03 Alias added: GHSA-7f5q-x8vx-pfrp
References
Patch 1
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Sources
- CVE-2023-4155 · CVE Program
- CVE-2023-4155 · NVD
- FIRST EPSS
- GHSA-7f5q-x8vx-pfrp · GitHub Advisory Database · CC BY 4.0
- CVE-2023-4155 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences