CVE-2023-4155: Sev-es / sev-snp vmgexit double fetch vulnerability
First published: Fri Jun 09 2023(Updated: )
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`).
Credit: secalert@redhat.com secalert@redhat.com secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | ||
| Red Hat Enterprise Linux | =8.0 | |
| Red Hat Enterprise Linux | =9.0 | |
| Fedoraproject Fedora | =37 | |
| Fedoraproject Fedora | =38 | |
| IBM Security Verify Governance, Identity Manager software component | <=ISVG 10.0.2 | |
| IBM Security Verify Governance, Identity Manager virtual appliance component | <=ISVG 10.0.2 | |
| Linux Kernel | ||
| debian/linux | 5.10.223-1 5.10.226-1 6.1.123-1 6.1.119-1 6.12.10-1 6.12.11-1 |
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Reference Links
- https://www.cve.org/CVERecord?id=CVE-2023-4155 https://nvd.nist.gov/vuln/detail/CVE-2023-4155
- https://bugzilla.redhat.com/show_bug.cgi?id=2213802
- https://access.redhat.com/security/cve/CVE-2023-4155
- https://launchpad.net/bugs/cve/CVE-2023-4155
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2213802#c0
- https://patchew.org/linux/20230804173355.51753-1-pbonzini@redhat.com/
- https://patchew.org/linux/20230804173355.51753-1-pbonzini@redhat.com/20230804173355.51753-3-pbonzini@redhat.com/
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2229642
- https://access.redhat.com/errata/RHSA-2023:6583
- https://access.redhat.com/errata/RHSA-2023:6901
- https://access.redhat.com/errata/RHSA-2023:7077
- https://access.redhat.com/errata/RHSA-2024:3859
- https://access.redhat.com/errata/RHSA-2024:4740
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-4155
- https://nvd.nist.gov/vuln/detail/CVE-2023-4155
- https://security-tracker.debian.org/tracker/CVE-2023-4155
- https://ubuntu.com/security/CVE-2023-4155
- https://git.kernel.org/linus/7588dbcebcbf0193ab5b76987396d0254270b04a
- https://www.ibm.com/support/pages/node/7172423 (Advisory)
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