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CVE-2021-33909

Quick assessment

Affected
n/a n/a
Exploitation
Public or AI PoC available; prioritize validation
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 存在输入验证错误漏洞，该漏洞源于一个越界写入缺陷。

AI Predicted 7.8 Difficulty: Moderate EPSS 9.81% · P96

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation
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I. Basic Information for CVE-2021-33909

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
fs/seq_file.c in the Linux kernel 3.16 through 5.13.x before 5.13.4 does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root by an unprivileged user, aka CID-8cae8cd89f05.
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 输入验证错误漏洞
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 存在输入验证错误漏洞，该漏洞源于一个越界写入缺陷。
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
- n/a n/a -

II. Public POCs for CVE-2021-33909

# POC Description Source Link Shenlong Link
1 Sequoia exploit (7/20/21) https://github.com/Liang2580/CVE-2021-33909 POC Details
2 This module fixes an issue in the kernels filesystem layer (CVE-2021-33909) by kprobe-replacing vulnerable functions during runtime https://github.com/baerwolf/cve-2021-33909 POC Details
3 Exploit code for CVE-2021-33909,Just a dump of removed https://github.com/AmIAHuman/ repo https://github.com/bbinfosec43/CVE-2021-33909 POC Details
4 CVE-2021-33909 Sequoia https://github.com/ChrisTheCoolHut/CVE-2021-33909 POC Details
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III. Intelligence Information for CVE-2021-33909

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Patches & Fixes for CVE-2021-33909 (1)

Vendor Advisories for CVE-2021-33909 (3)

Exploits & Public PoCs for CVE-2021-33909 (3)

Mailing List Discussions for CVE-2021-33909 (10)

Other References for CVE-2021-33909 (2)

Same Patch Batch · n/a · 2021-07-20 · 26 CVEs total

CVE-2021-35054 Minecraft 路径遍历漏洞
CVE-2021-36980 Open vSwitch 资源管理错误漏洞
CVE-2021-36978 QPDF 缓冲区错误漏洞
CVE-2021-3246 libsndfile 缓冲区错误漏洞
CVE-2019-25051 GNU Aspell 缓冲区错误漏洞
CVE-2019-25050 GDAL 缓冲区错误漏洞
CVE-2020-36431 Unicorn Engine 缓冲区错误漏洞
CVE-2020-36430 libass 缓冲区错误漏洞
CVE-2020-36429 open62541 缓冲区错误漏洞
CVE-2020-36428 MAT File I/O Library 缓冲区错误漏洞
CVE-2021-36979 Unicorn Engine 缓冲区错误漏洞
CVE-2021-36977 MAT File I/O Library 缓冲区错误漏洞
CVE-2021-36976 libarchive 资源管理错误漏洞
CVE-2021-36230 HashiCorp Terraform 授权问题漏洞
CVE-2021-27021 Puppet SQL注入漏洞
CVE-2020-15660 geckodriver 跨站请求伪造漏洞
CVE-2021-27517 Foxit PDF SDK For Web 跨站脚本漏洞
CVE-2021-27338 Faraday Edge 跨站脚本漏洞
CVE-2020-35427 Teachers Record Management System SQL注入漏洞
CVE-2021-33910 systemd 安全漏洞

Showing top 20 of 26 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: n/a
Same vendor: n/a