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CVE-2021-21781

Quick assessment

Affected
n/a 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Linux kernel 功能中的数据输出过多，用户态应用程序可以读取 sigpage 的内容，从而泄漏内核内存内容。攻击者可利用该漏洞允许本地用户访问可能敏感的信息。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.50% · P40

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2021-21781

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
An information disclosure vulnerability exists in the ARM SIGPAGE functionality of Linux Kernel v5.4.66 and v5.4.54. The latest version (5.11-rc4) seems to still be vulnerable. A userland application can read the contents of the sigpage, which can leak kernel memory contents. An attacker can read a process’s memory at a specific offset to trigger this vulnerability. This was fixed in kernel releases: 4.14.222 4.19.177 5.4.99 5.10.17 5.11
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
对未经初始化资源的使用
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Linux kernel 功能中的数据输出过多，用户态应用程序可以读取 sigpage 的内容，从而泄漏内核内存内容。攻击者可利用该漏洞允许本地用户访问可能敏感的信息。
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 v5.4.54, Linux Kernel v5.4.66 -

II. Public POCs for CVE-2021-21781

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III. Intelligence Information for CVE-2021-21781

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Vendor Advisories for CVE-2021-21781 (1)

Other References for CVE-2021-21781 (1)

Same Patch Batch · n/a · 2021-08-18 · 54 CVEs total

CVE-2021-23424 7.5 HIGH Regular Expression Denial of Service (ReDoS)
CVE-2021-23425 5.3 MEDIUM Regular Expression Denial of Service (ReDoS)
CVE-2021-21856 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-39268 SuiteCRM 跨站脚本漏洞
CVE-2021-21846 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21851 GPAC 输入验证错误漏洞
CVE-2021-21847 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21845 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-39267 SuiteCRM 跨站脚本漏洞
CVE-2021-21855 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21854 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21857 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21858 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2021-21825 AT&T Labs Xmill 缓冲区错误漏洞
CVE-2021-21862 GPAC Project Advanced Content 缓冲区错误漏洞
CVE-2020-18746 AiteCMS SQL注入漏洞
CVE-2021-37358 SeaCMS SQL注入漏洞
CVE-2021-21867 3s-smart Software Solutions CODESYS Development System 代码问题漏洞
CVE-2021-21868 3s-smart Software Solutions CODESYS Development System 代码问题漏洞
CVE-2021-38710 Github yclas 跨站脚本漏洞

Showing top 20 of 54 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux Kernel
Same vendor: n/a
Same weakness: CWE-908

V. Comments for CVE-2021-21781

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