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CVE-2022-4994— KVM: x86: wean fast IN from emulator_pio_in

Quick assessment

Affected
Linux Linux
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基金会开源的一款操作系统内核。 Linux kernel 4.10版本存在安全漏洞，该漏洞源于KVM x86中快速PIO输入处理方式的变更。

EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 4

VendorProduct Version RangeStatus
Linux Linux 8370c3d08bd98576d97514eca29970e03767a5d1< dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3 affected
4.10 affected
< 4.10 unaffected
6.0≤ * unaffected
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I. Basic Information for CVE-2022-4994

Vulnerability Information
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Vulnerability Title
KVM: x86: wean fast IN from emulator_pio_in
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: x86: wean fast IN from emulator_pio_in Use __emulator_pio_in() directly for fast PIO instead of bouncing through emulator_pio_in() now that __emulator_pio_in() fills "val" when handling in-kernel PIO. vcpu->arch.pio.count is guaranteed to be '0', so this a pure nop. emulator_pio_in_emulated is now the last caller of emulator_pio_in. No functional change intended.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
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基金会开源的一款操作系统内核。 Linux kernel 4.10版本存在安全漏洞，该漏洞源于KVM x86中快速PIO输入处理方式的变更。
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 8370c3d08bd98576d97514eca29970e03767a5d1 ~ dc7a4bfde507ffe1d8bef49aba1322f1d20c2cb3 -
Linux Linux 4.10 -

II. Public POCs for CVE-2022-4994

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III. Intelligence Information for CVE-2022-4994

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Patches & Fixes for CVE-2022-4994 (1)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2022-4994

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