CVE-2023-4155: Sev-es / sev-snp vmgexit double fetch vulnerability

Published Jun 9, 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 (CONFIGVMAPSTACK).

Other sources

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 theoretically trigger a stack overflow and cause a denial-of-service or potentially guest-to-host escape in kernel configurations without stack guard pages (CONFIGVMAPSTACK).

— Red Hat

Linux Kernel is vulnerable to a denial of service, caused by a race condition in KVM AMD Secure Encrypted Virtualization (SEV). By sending a specially crafted request using the VMGEXIT handler recursively, a local authenticated attacker could exploit this vulnerability to cause a denial of service condition.

— IBM

Affected Software

103 affected componentsFixes available
Linux Linux kernel
redhat Enterprise Linux=8.0
redhat 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
ubuntu/linux-hwe-edge*
ubuntu/linux-aws-5.0*
ubuntu/linux-aws-5.3*
ubuntu/linux-azure*
ubuntu/linux-azure-5.3*
ubuntu/linux-azure-edge*
ubuntu/linux-gcp*
ubuntu/linux-gcp-5.3*
ubuntu/linux-gke-4.15*
ubuntu/linux-gke-5.4*
ubuntu/linux-gkeop-5.4*
ubuntu/linux-hwe*
ubuntu/linux-oem*
ubuntu/linux-oracle-5.0*
ubuntu/linux-oracle-5.3*
ubuntu/linux-aws-5.15<5.15.0-1047.52~20.04.1
5.15.0-1047.52~20.04.1
ubuntu/linux-azure-5.15<5.15.0-1049.56~20.04.1
5.15.0-1049.56~20.04.1
ubuntu/linux-gcp-5.15<5.15.0-1044.52~20.04.1
5.15.0-1044.52~20.04.1
ubuntu/linux-gkeop-5.15<5.15.0-1030.35~20.04.1
5.15.0-1030.35~20.04.1
ubuntu/linux-hwe-5.15<5.15.0-86.96~20.04.1
5.15.0-86.96~20.04.1
ubuntu/linux-ibm-5.15<5.15.0-1040.43~20.04.1
5.15.0-1040.43~20.04.1
ubuntu/linux-intel-iotg-5.15<5.15.0-1043.49~20.04.1
5.15.0-1043.49~20.04.1
ubuntu/linux-lowlatency-hwe-5.15<5.15.0-86.95~20.04.1
5.15.0-86.95~20.04.1
ubuntu/linux-nvidia-tegra-5.15<5.15.0-1018.18~20.04.1
5.15.0-1018.18~20.04.1
ubuntu/linux-oracle-5.15<5.15.0-1045.51~20.04.1
5.15.0-1045.51~20.04.1
ubuntu/linux-riscv-5.15<5.15.0-1043.47~20.04.1
5.15.0-1043.47~20.04.1
ubuntu/linux-aws-5.11*
ubuntu/linux-aws-5.13*
ubuntu/linux-aws-5.8*
ubuntu/linux-azure-5.11*
ubuntu/linux-azure-5.13*
ubuntu/linux-azure-5.8*
ubuntu/linux-gcp-5.11*
ubuntu/linux-gcp-5.13*
ubuntu/linux-gcp-5.8*
ubuntu/linux-gke*
ubuntu/linux-gke-5.15*
ubuntu/linux-hwe-5.11*
ubuntu/linux-hwe-5.13*
ubuntu/linux-hwe-5.8*
ubuntu/linux-intel-5.13*
ubuntu/linux-oem-5.10*
ubuntu/linux-oem-5.13*
ubuntu/linux-oem-5.6*
ubuntu/linux-oracle-5.11*
ubuntu/linux-oracle-5.13*
ubuntu/linux-oracle-5.8*
ubuntu/linux-raspi2*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.11*
ubuntu/linux-riscv-5.8*
ubuntu/linux<5.15.0-86.96
5.15.0-86.96
ubuntu/linux-allwinner-5.19*
ubuntu/linux-aws<5.15.0-1047.52
5.15.0-1047.52
ubuntu/linux-aws-5.19*
ubuntu/linux-aws-6.2<6.2.0-1013.13~22.04.1
6.2.0-1013.13~22.04.1
ubuntu/linux-azure<5.15.0-1049.56
5.15.0-1049.56
ubuntu/linux-azure-5.19*
ubuntu/linux-azure-6.2<6.2.0-1014.14~22.04.1
6.2.0-1014.14~22.04.1
ubuntu/linux-azure-fde<5.15.0-1049.56.1
5.15.0-1049.56.1
ubuntu/linux-azure-fde-5.19*
ubuntu/linux-azure-fde-6.2<6.2.0-1014.14~22.04.1.1
6.2.0-1014.14~22.04.1.1
ubuntu/linux-gcp<5.15.0-1044.52
5.15.0-1044.52
ubuntu/linux-gcp-5.19*
ubuntu/linux-gcp-6.2<6.2.0-1016.18~22.04.1
6.2.0-1016.18~22.04.1
ubuntu/linux-gke<5.15.0-1044.49
5.15.0-1044.49
ubuntu/linux-gkeop<5.15.0-1030.35
5.15.0-1030.35
ubuntu/linux-hwe-5.19*
ubuntu/linux-hwe-6.2<6.2.0-34.34~22.04.1
6.2.0-34.34~22.04.1
ubuntu/linux-ibm<5.15.0-1040.43
5.15.0-1040.43
ubuntu/linux-intel-iotg<5.15.0-1043.49
5.15.0-1043.49
ubuntu/linux-kvm<5.15.0-1044.49
5.15.0-1044.49
ubuntu/linux-lowlatency<5.15.0-86.95
5.15.0-86.95
ubuntu/linux-lowlatency-hwe-5.19*
ubuntu/linux-lowlatency-hwe-6.2<6.2.0-1014.14~22.04.1
6.2.0-1014.14~22.04.1
ubuntu/linux-nvidia<5.15.0-1037.37
5.15.0-1037.37
ubuntu/linux-nvidia-6.2<6.2.0-1011.11
6.2.0-1011.11
ubuntu/linux-nvidia-tegra<5.15.0-1018.18
5.15.0-1018.18
ubuntu/linux-nvidia-tegra-igx<5.15.0-1005.5
5.15.0-1005.5
ubuntu/linux-oem-5.17*
ubuntu/linux-oem-6.0*
ubuntu/linux-oem-6.1<6.1.0-1021.21
6.1.0-1021.21
ubuntu/linux-oracle<5.15.0-1045.51
5.15.0-1045.51
ubuntu/linux-raspi<5.15.0-1040.43
5.15.0-1040.43
ubuntu/linux-realtime*
ubuntu/linux-riscv*
ubuntu/linux-riscv-5.19*
ubuntu/linux-starfive-5.19*
ubuntu/linux-xilinx-zynqmp<5.15.0-1025.29
5.15.0-1025.29
ubuntu/linux-bluefield<5.15.0-1027.29
5.15.0-1027.29
ubuntu/linux-intel-iot-realtime<5.15.0-1040.42
5.15.0-1040.42
ubuntu/linux-realtime<5.15.0-1048.54
5.15.0-1048.54
ubuntu/linux-fips*
ubuntu/linux-raspi-realtime*
ubuntu/linux-vmware*
debian/linux
6.1.176-16.1.190-16.12.107-16.12.116-17.2.15-17.3.4-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade ubuntu/linux-aws-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1047.52~20.04.1
  2. Upgrade

    Upgrade ubuntu/linux-azure-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1049.56~20.04.1
  3. Upgrade

    Upgrade ubuntu/linux-gcp-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1044.52~20.04.1
  4. Upgrade

    Upgrade ubuntu/linux-gkeop-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1030.35~20.04.1
  5. Upgrade

    Upgrade ubuntu/linux-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-86.96~20.04.1
  6. Upgrade

    Upgrade ubuntu/linux-ibm-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.43~20.04.1
  7. Upgrade

    Upgrade ubuntu/linux-intel-iotg-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1043.49~20.04.1
  8. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-86.95~20.04.1
  9. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1018.18~20.04.1
  10. Upgrade

    Upgrade ubuntu/linux-oracle-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1045.51~20.04.1
  11. Upgrade

    Upgrade ubuntu/linux-riscv-5.15 to a version that resolves this vulnerability.

    Fixed in 5.15.0-1043.47~20.04.1
  12. Upgrade

    Upgrade ubuntu/linux to a version that resolves this vulnerability.

    Fixed in 5.15.0-86.96
  13. Upgrade

    Upgrade ubuntu/linux-aws to a version that resolves this vulnerability.

    Fixed in 5.15.0-1047.52
  14. Upgrade

    Upgrade ubuntu/linux-aws-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1013.13~22.04.1
  15. Upgrade

    Upgrade ubuntu/linux-azure to a version that resolves this vulnerability.

    Fixed in 5.15.0-1049.56
  16. Upgrade

    Upgrade ubuntu/linux-azure-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1014.14~22.04.1
  17. Upgrade

    Upgrade ubuntu/linux-azure-fde to a version that resolves this vulnerability.

    Fixed in 5.15.0-1049.56.1
  18. Upgrade

    Upgrade ubuntu/linux-azure-fde-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1014.14~22.04.1.1
  19. Upgrade

    Upgrade ubuntu/linux-gcp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1044.52
  20. Upgrade

    Upgrade ubuntu/linux-gcp-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1016.18~22.04.1
  21. Upgrade

    Upgrade ubuntu/linux-gke to a version that resolves this vulnerability.

    Fixed in 5.15.0-1044.49
  22. Upgrade

    Upgrade ubuntu/linux-gkeop to a version that resolves this vulnerability.

    Fixed in 5.15.0-1030.35
  23. Upgrade

    Upgrade ubuntu/linux-hwe-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-34.34~22.04.1
  24. Upgrade

    Upgrade ubuntu/linux-ibm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.43
  25. Upgrade

    Upgrade ubuntu/linux-intel-iotg to a version that resolves this vulnerability.

    Fixed in 5.15.0-1043.49
  26. Upgrade

    Upgrade ubuntu/linux-kvm to a version that resolves this vulnerability.

    Fixed in 5.15.0-1044.49
  27. Upgrade

    Upgrade ubuntu/linux-lowlatency to a version that resolves this vulnerability.

    Fixed in 5.15.0-86.95
  28. Upgrade

    Upgrade ubuntu/linux-lowlatency-hwe-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1014.14~22.04.1
  29. Upgrade

    Upgrade ubuntu/linux-nvidia to a version that resolves this vulnerability.

    Fixed in 5.15.0-1037.37
  30. Upgrade

    Upgrade ubuntu/linux-nvidia-6.2 to a version that resolves this vulnerability.

    Fixed in 6.2.0-1011.11
  31. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra to a version that resolves this vulnerability.

    Fixed in 5.15.0-1018.18
  32. Upgrade

    Upgrade ubuntu/linux-nvidia-tegra-igx to a version that resolves this vulnerability.

    Fixed in 5.15.0-1005.5
  33. Upgrade

    Upgrade ubuntu/linux-oem-6.1 to a version that resolves this vulnerability.

    Fixed in 6.1.0-1021.21
  34. Upgrade

    Upgrade ubuntu/linux-oracle to a version that resolves this vulnerability.

    Fixed in 5.15.0-1045.51
  35. Upgrade

    Upgrade ubuntu/linux-raspi to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.43
  36. Upgrade

    Upgrade ubuntu/linux-xilinx-zynqmp to a version that resolves this vulnerability.

    Fixed in 5.15.0-1025.29
  37. Upgrade

    Upgrade ubuntu/linux-bluefield to a version that resolves this vulnerability.

    Fixed in 5.15.0-1027.29
  38. Upgrade

    Upgrade ubuntu/linux-intel-iot-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1040.42
  39. Upgrade

    Upgrade ubuntu/linux-realtime to a version that resolves this vulnerability.

    Fixed in 5.15.0-1048.54
  40. Upgrade

    Upgrade debian/linux to a version that resolves this vulnerability.

    Fixed in 6.1.176-1Fixed in 6.1.190-1Fixed in 6.12.107-1Fixed in 6.12.116-1Fixed in 7.2.15-1Fixed in 7.3.4-1

Event History

Jun 9, 2023
Data Sourced
via Red Hat·12:51 PM
DescriptionSeverityAffected Software
Aug 4, 2023
CVE Published
12:00 AM
Data Sourced
12:00 AM
RemedyDescriptionSeverityWeakness
Aug 9, 2023
Data Sourced
via OSV·12:00 AM
DescriptionSeverityAffected Software
Sep 13, 2023
CVE Published
via MITRE·04:11 PM
Data Sourced
via MITRE·04:11 PM
DescriptionSeverityWeakness

Parent advisories

This vulnerability appears in the following advisories.

Frequently Asked Questions

1

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.

2

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.

3

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.

4

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.

5

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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