• Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
MUST READ

Cisco confirms active exploitation of ISE and ISE-PIC flaws

 | 

SharePoint under fire: new ToolShell attacks target enterprises

 | 

CrushFTP zero-day actively exploited at least since July 18

 | 

Hardcoded credentials found in HPE Aruba Instant On Wi-Fi devices

 | 

MuddyWater deploys new DCHSpy variants amid Iran-Israel conflict

 | 

U.S. CISA urges to immediately patch Microsoft SharePoint flaw adding it to its Known Exploited Vulnerabilities catalog

 | 

Microsoft issues emergency patches for SharePoint zero-days exploited in "ToolShell" attacks

 | 

SharePoint zero-day CVE-2025-53770 actively exploited in the wild

 | 

Singapore warns China-linked group UNC3886 targets its critical infrastructure

 | 

U.S. CISA adds Fortinet FortiWeb flaw to its Known Exploited Vulnerabilities catalog

 | 

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 54

 | 

Security Affairs newsletter Round 533 by Pierluigi Paganini – INTERNATIONAL EDITION

 | 

Radiology Associates of Richmond data breach impacts 1.4 million people

 | 

Fortinet FortiWeb flaw CVE-2025-25257 exploited hours after PoC release

 | 

Authorities released free decryptor for Phobos and 8base ransomware

 | 

Anne Arundel Dermatology data breach impacts 1.9 million people

 | 

LameHug: first AI-Powered malware linked to Russia’s APT28

 | 

5 Features Every AI-Powered SOC Platform Needs in 2025

 | 

Broadcom patches critical VMware flaws exploited at Pwn2Own Berlin 2025

 | 

Stormous Ransomware gang targets North Country HealthCare, claims 600K patient data stolen

 | 
  • Home
  • Cyber Crime
  • Cyber warfare
  • APT
  • Data Breach
  • Deep Web
  • Digital ID
  • Hacking
  • Hacktivism
  • Intelligence
  • Internet of Things
  • Laws and regulations
  • Malware
  • Mobile
  • Reports
  • Security
  • Social Networks
  • Terrorism
  • ICS-SCADA
  • POLICIES
  • Contact me
  • Home
  • Breaking News
  • Hacking
  • Malware
  • Security
  • PoC rootkit Curing evades traditional Linux detection systems

PoC rootkit Curing evades traditional Linux detection systems

Pierluigi Paganini April 28, 2025

Researchers created a PoC rootkit called Curing that uses Linux’s io_uring feature to evade traditional system call monitoring.

Armo researchers have demonstrated a proof-of-concept (PoC) rootkit named Curing that relies on Linux asynchronous I/O mechanism io_uring to bypass traditional system call monitoring.

“Curing is a POC of a rootkit that uses io_uring to perform different tasks without using any syscalls, making it invisible to security tools which are only monitoring syscalls. The project was found effective against many of the most popular security tools such as Linux EDRs solutions and container security. tools.” reads the description provided by the researchers on GitHub.”The idea was born at the latest CCC conference #38c3, therefor the name Curing which is a mix of C and io_uring.”

io_uring is a Linux API for asynchronous I/O that uses shared ring buffers between user and kernel space, letting applications perform actions without system calls, making syscall-based security tools ineffective.

The io_uring was introduced in the Linux kernel version 5.1 in March 2019.

“The rootkit demonstrates communication between a C2 server and an infected host to pull commands and execute them without making any system calls relevant to its operations.” reads the report published by the experts. “The main idea was to show that io_uring allows so many important operations that you can write an entire rootkit on top of.”

The researchers explained that at the time of writing, io_uring supports 61 operations, including network and file system tasks. Researchers built a fully functional rootkit that relies entirely on io_uring to demonstrate the real-world risk.

The Curing PoC code for bypassing Falco and Tetragon runtime detection systems is available here.

Researchers speculate that many Linux EDRs are not able to monitor io_uring-based activity. Falco proved blind to such operations, but plans to add LSM hook support. Tetragon could detect io_uring if users manually configure Kprobes or LSM hooks. Microsoft Defender failed to detect various malicious actions like file reads, EICAR drops, and crypto miners, with only basic FIM alerts triggered. SentinelOne confirmed that its agent can detect and neutralize the attacks. Many commercial vendors were either vulnerable or unresponsive, suggesting io_uring rootkits pose a broad risk to current Linux security solutions.

“Today, many security vendors are shifting towards building eBPF-based agents, largely because eBPF is considered “safe” for use in products like EDR and CWPP.” concludes the report. “However, working with eBPF comes with inherent challenges and constraints, particularly due to its verifier, which imposes strict limitations on what code can be safely loaded. This makes the placement of hooks a critical decision.”

Follow me on Twitter: @securityaffairs and Facebook and Mastodon

Pierluigi Paganini

(SecurityAffairs – hacking, Curing)


facebook linkedin twitter

Curing EDR Hacking information security news IT Information Security LINUX malware Pierluigi Paganini Security News

you might also like

Pierluigi Paganini July 22, 2025
Cisco confirms active exploitation of ISE and ISE-PIC flaws
Read more
Pierluigi Paganini July 22, 2025
SharePoint under fire: new ToolShell attacks target enterprises
Read more

leave a comment

newsletter

Subscribe to my email list and stay
up-to-date!

    recent articles

    Cisco confirms active exploitation of ISE and ISE-PIC flaws

    Hacking / July 22, 2025

    SharePoint under fire: new ToolShell attacks target enterprises

    Hacking / July 22, 2025

    CrushFTP zero-day actively exploited at least since July 18

    Hacking / July 22, 2025

    Hardcoded credentials found in HPE Aruba Instant On Wi-Fi devices

    Security / July 22, 2025

    MuddyWater deploys new DCHSpy variants amid Iran-Israel conflict

    APT / July 21, 2025

    To contact me write an email to:

    Pierluigi Paganini :
    pierluigi.paganini@securityaffairs.co

    LEARN MORE

    QUICK LINKS

    • Home
    • Cyber Crime
    • Cyber warfare
    • APT
    • Data Breach
    • Deep Web
    • Digital ID
    • Hacking
    • Hacktivism
    • Intelligence
    • Internet of Things
    • Laws and regulations
    • Malware
    • Mobile
    • Reports
    • Security
    • Social Networks
    • Terrorism
    • ICS-SCADA
    • POLICIES
    • Contact me

    Copyright@securityaffairs 2024

    We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. By clicking “Accept All”, you consent to the use of ALL the cookies. However, you may visit "Cookie Settings" to provide a controlled consent.
    Cookie SettingsAccept All
    Manage consent

    Privacy Overview

    This website uses cookies to improve your experience while you navigate through the website. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities...
    Necessary
    Always Enabled
    Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information.
    Non-necessary
    Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies. It is mandatory to procure user consent prior to running these cookies on your website.
    SAVE & ACCEPT