CVE-2022-2196 Speculative execution attacks in KVM VMX

2023-01-0910:59:53

CWE-1188

Google

www.cve.org

linux kernel

kvm

spectre v2

5.8 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

LOW

Integrity Impact

HIGH

Availability Impact

LOW

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L

9 High

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

9.8%

JSON

A regression exists in the Linux Kernel within KVM: nVMX that allowed for speculative execution attacks. L2 can carry out Spectre v2 attacks on L1 due to L1 thinking it doesn’t need retpolines or IBPB after running L2 due to KVM (L0) advertising eIBRS support to L1. An attacker at L2 with code execution can execute code on an indirect branch on the host machine. We recommend upgrading to Kernel 6.2 or past commit 2e7eab81425a

CNA Affected

[
  {
    "defaultStatus": "unaffected",
    "packageName": "KVM",
    "product": "Linux Kernel",
    "repo": "https://git.kernel.org/",
    "vendor": "Linux",
    "versions": [
      {
        "lessThan": "2e7eab81425a",
        "status": "affected",
        "version": "0",
        "versionType": "git"
      },
      {
        "lessThan": "6.2",
        "status": "affected",
        "version": "0",
        "versionType": "custom"
      }
    ]
  }
]