CVE-2021-3656
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I. Basic Information for CVE-2021-3656
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制缺失
Source: NVD (National Vulnerability Database)
Vulnerability Title
KVM 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
KVM是基于内核的虚拟机。 KVM 的 AMD 代码中存在安全漏洞，该漏洞源于在处理 L1 来宾提供的 VMCB（虚拟机控制块）以生成/处理嵌套来宾 (L2) 时对“virt_ext”的不正确验证。
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 |
|---|---|---|---|---|
| - | KVM | Fixed-In v5.14-rc7 and above | - |
II. Public POCs for CVE-2021-3656
| # | POC Description | Source Link | Shenlong Link |
|---|---|---|---|
| 1 | None | https://github.com/rami08448/CVE-2021-3656-Demo | POC Details |
AI-Generated POCPremium
No public POC found.
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- Oh noes!x_refsource_MISC
- https://bugzilla.redhat.com/show_bug.cgi?id=1983988x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/08/16/1x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-3656
Same Patch Batch · n/a · 2022-03-04 · 45 CVEs total
| CVE-2022-23915 | 7.2 HIGH | Remote Code Execution (RCE) |
| CVE-2022-26484 | 4.9 MEDIUM | Veritas InfoScale Operations Manager路径遍历漏洞 |
| CVE-2022-26483 | 4.8 MEDIUM | Veritas Infoscale Operations Manager 跨站脚本漏洞 |
| CVE-2022-22946 | Vmware VMware Spring Cloud Gateway 信任管理问题漏洞 | |
| CVE-2022-26318 | WatchGuard Firebox 安全漏洞 | |
| CVE-2021-27757 | HCL BigFix Insights 安全漏洞 | |
| CVE-2021-27756 | HCL BigFix Compliance 加密问题漏洞 | |
| CVE-2021-44827 | Tp-link Archer C2 操作系统命令注入漏洞 | |
| CVE-2021-40846 | Rhinode Trading Paints 安全漏洞 | |
| CVE-2021-46384 | MingSoft MCMS 访问控制错误漏洞 | |
| CVE-2021-46353 | D-Link Dir-X1860 安全漏洞 | |
| CVE-2022-23232 | Netapp StorageGRID 授权问题漏洞 | |
| CVE-2021-3575 | OpenJPEG 缓冲区错误漏洞 | |
| CVE-2021-3428 | Linux kernel 输入验证错误漏洞 | |
| CVE-2021-20319 | coreos-installer 数据伪造问题漏洞 | |
| CVE-2022-21828 | Incapptic Connect 安全漏洞 | |
| CVE-2022-25623 | Symantec Management Center 安全漏洞 | |
| CVE-2021-3744 | Linux kernel 安全漏洞 | |
| CVE-2021-3743 | Linux kernel 缓冲区错误漏洞 | |
| CVE-2022-23729 | LG mobile 授权问题漏洞 |
Showing top 20 of 45 CVEs. View all on vendor page → →
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Same vendor: n/a
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V. Comments for CVE-2021-3656
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