medium
5.6
CWE
362 367
Advisory Published
CVE Published
CVE Published
Updated

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 SoftwareAffected VersionHow to fix
IBM Security Verify Governance - Identity Manager<=ISVG 10.0.2
IBM Security Verify Governance, Identity Manager<=ISVG 10.0.2
Linux kernel
Red Hat Enterprise Linux=8.0
Red Hat Enterprise Linux=9.0
Fedora=37
Fedora=38
debian/linux
5.10.223-1
5.10.234-1
6.1.123-1
6.1.128-1
6.12.12-1
6.12.16-1

Remedy

https://bugzilla.redhat.com/show_bug.cgi?id=2213802

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is the severity of CVE-2023-4155?

    CVE-2023-4155 is classified as high severity due to the potential for a double fetch race condition vulnerability.

  • How do I fix CVE-2023-4155?

    To fix CVE-2023-4155, you should update to the latest kernel version provided by your distribution that includes the patches for this vulnerability.

  • What systems are affected by CVE-2023-4155?

    CVE-2023-4155 affects KVM guests using SEV-ES or SEV-SNP in several Linux distributions, including specific versions of Red Hat Enterprise Linux and Fedora.

  • What impact does CVE-2023-4155 have on my system?

    CVE-2023-4155 can allow an attacker to invoke the VMGEXIT handler recursively, potentially leading to denial of service or unauthorized access.

  • How can I determine if my system is vulnerable to CVE-2023-4155?

    To determine if your system is vulnerable to CVE-2023-4155, check if you are using a susceptible version of the Linux kernel with SEV-ES or SEV-SNP configurations.

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