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CVE-2021-22543— Improper memory handling in Linux KVM

Quick assessment

Affected
Linux Kernel 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.

KVM是基于内核的虚拟机。 Linux KVM存在缓冲区错误漏洞，该漏洞允许用户能够启动和控制VM读取和写入随机内存页，并可能导致本地特权升级。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.66% · P50
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I. Basic Information for CVE-2021-22543

Vulnerability Information
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Vulnerability Title
Improper memory handling in Linux KVM
Source: CVE Program / CVE List V5
Vulnerability Description
An issue was discovered in Linux: KVM through Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks and can lead to pages being freed while still accessible by the VMM and guest. This allows users with the ability to start and control a VM to read/write random pages of memory and can result in local privilege escalation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:L/SC:H/SI:H/SA:L
Source: CVE Program / CVE List V5
Vulnerability Type
内存缓冲区边界内操作的限制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
KVM 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
KVM是基于内核的虚拟机。 Linux KVM存在缓冲区错误漏洞，该漏洞允许用户能够启动和控制VM读取和写入随机内存页，并可能导致本地特权升级。
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 Kernel Linux Kernel add6a0cd1c5ba51b201e1361b05a5df817083618 ~ f8be156be163a052a067306417cd0ff679068c97 -

II. Public POCs for CVE-2021-22543

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III. Intelligence Information for CVE-2021-22543

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Vendor Advisories for CVE-2021-22543 (2)

Mailing List Discussions for CVE-2021-22543 (5)

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: Linux Kernel
Same weakness: CWE-119

V. Comments for CVE-2021-22543

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