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CVE-2022-2196— Speculative execution attacks in KVM VMX

Quick assessment

Affected
Linux Linux Kernel
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于nVMX 允许推测执行攻击，L2 可以对 L1 执行 Spectre v2 攻击，因为 L1 认为它在运行 L2 后不需要 retpolines 或 IBPB，由于 KVM (L0) 向 L1 通告 eIBRS 支持，具有代码执行能力的 L2 攻击者可以在主机的间接分支上执行代码。

CVSS 5.8 · Medium EPSS 0.35% · P29

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux Kernel 64b8f33b2e1e687d465b5cb382e7bec495f1e026< f93a1a5bdcdd122aae0a3eab7a52c15b71fb725b affected
e089a83fbc55b8057f332c00f125acaa02b08ef7< 2e7eab81425ad6c875f2ed47c0ce01e78afc38a5 affected
02a3868d18fe639363f1cea6e6d7914513198e43< 2e7eab81425ad6c875f2ed47c0ce01e78afc38a5 affected
5c911beff20aa8639e7a1f28988736c13e03ed54< 1b0cafaae8884726c597caded50af185ffc13349 affected
5c911beff20aa8639e7a1f28988736c13e03ed54< 6b539a7dbb49250f92515c2ba60aea239efc9e35 affected
5c911beff20aa8639e7a1f28988736c13e03ed54< 63fada296062e91ad9f871970d4e7f19e21a6a15 affected
5c911beff20aa8639e7a1f28988736c13e03ed54< 2e7eab81425ad6c875f2ed47c0ce01e78afc38a5 affected
5.4.47< 5.4.233 affected
… +6 more rows
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I. Basic Information for CVE-2022-2196

Vulnerability Information
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Vulnerability Title
Speculative execution attacks in KVM VMX
Source: CVE Program / CVE List V5
Vulnerability Description
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 applying the relevant stable backports (v5.4.233, v5.10.170, v5.15.96, v6.1.14).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
不安全的默认资源初始化
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于nVMX 允许推测执行攻击，L2 可以对 L1 执行 Spectre v2 攻击，因为 L1 认为它在运行 L2 后不需要 retpolines 或 IBPB，由于 KVM (L0) 向 L1 通告 eIBRS 支持，具有代码执行能力的 L2 攻击者可以在主机的间接分支上执行代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux Kernel 64b8f33b2e1e687d465b5cb382e7bec495f1e026 ~ f93a1a5bdcdd122aae0a3eab7a52c15b71fb725b -

II. Public POCs for CVE-2022-2196

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III. Intelligence Information for CVE-2022-2196

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Patches & Fixes for CVE-2022-2196 (4)

Mailing List Discussions for CVE-2022-2196 (1)

Other References for CVE-2022-2196 (1)

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: Linux
Same weakness: CWE-1188