VoidLink is a Linux C2 framework that generates implant binaries for cloud and enterprise environments. The implant, likely built using an LLM coding agent, demonstrates advanced capabilities including multi-cloud targeting, container awareness, and kernel-level stealth. It fingerprints cloud environments across AWS, GCP, Azure, Alibaba Cloud, and Tencent Cloud, harvesting credentials and detecting container runtimes. The malware includes plugins for container escape and Kubernetes privilege escalation, as well as a kernel-level rootkit that adapts its approach based on the host's kernel version. C2 communications use AES-256-GCM over HTTPS, disguised as normal web traffic. VoidLink highlights the growing concern of LLM-generated implants reducing the skill barrier for producing sophisticated malware.
The SSHStalker Linux botnet has infected approximately 7,000 systems by leveraging traditional mass-compromise techniques. It uses a pipeline that deploys various scanners and malware to propagate and maintain control over infected devices. Although it employs old methods, the botnet remains effective in targeting Linux environments. There are no known exploits in the wild specifically tied to this botnet, and no CVSS score has been assigned. The threat is rated medium severity due to its ability to compromise numerous systems and potentially disrupt operations or facilitate further attacks. European organizations running Linux servers or IoT devices are at risk, especially those with weak SSH credentials or exposed services. Mitigation requires focused hardening of SSH access, continuous monitoring for unusual scanning activity, and rapid incident response to contain infections. Countries with significant Linux infrastructure and high-value targets in technology and finance sectors are more likely to be affected. Given the botnet’s reliance on old techniques, organizations can defend effectively by applying best practices and proactive network hygiene.
The flaws allow threat actors to obtain root privileges or bypass authentication via Telnet and gain shell access as root. The post Organizations Warned of Exploited Linux Vulnerabilities appeared first on SecurityWeek .
A team of researchers from the Graz University of Technology in Austria has revived page Linux page cache attacks. The post Old Attack, New Speed: Researchers Optimize Page Cache Exploits appeared first on SecurityWeek .
The Sysdig Threat Research Team analyzed VoidLink, a sophisticated Linux malware framework targeting cloud environments. Key findings include the first documented Serverside Rootkit Compilation, Chinese development with AI assistance, adaptive detection evasion, and use of the Zig programming language. VoidLink employs a multi-stage loader architecture, fileless execution techniques, and kernel-level stealth mechanisms. It features three control channels, including a covert ICMP channel, and specialized functionality for cloud and container environments. Despite its sophistication, VoidLink can be detected using runtime monitoring tools. The malware shows indicators of Chinese-speaking developers with significant kernel expertise, likely using AI-assisted development methods.
Designed for long-term access, the framework targets cloud and container environments with loaders, implants, and rootkits. The post VoidLink Linux Malware Framework Targets Cloud Environments appeared first on SecurityWeek .
A set of three vulnerabilities were discovered in the BigWave driver on the Pixel 9 device, which is accessible from the mediacodec sandboxed context. One of these bugs enables a use-after-free condition that allows escaping the mediacodec sandbox and achieving arbitrary kernel read/write on the Pixel 9. The vulnerabilities were fixed on January 5, 2026. The BigWave driver accelerates AV1 decoding and is exposed to userland processes in the mediacodec SELinux context, which is intended to be constrained. The use-after-free arises from a race condition between ioctl processing and a worker thread handling hardware jobs, leading to a kernel object being freed while still referenced.
VoidLink is an advanced malware framework designed for Linux systems, focusing on cloud and container environments. It includes custom loaders, implants, rootkits, and modular plugins for long-term access. The framework employs a flexible architecture with a Plugin API inspired by Cobalt Strike. VoidLink uses multiple security mechanisms, including runtime code encryption and adaptive behavior based on the detected environment. Developed by Chinese-affiliated developers, it demonstrates high technical expertise across multiple programming languages. The framework includes cloud-focused capabilities, credential harvesting, and various command-and-control channels. While its intended use remains unclear, VoidLink appears to be positioned for potential commercial use.
Key takeaways VoidLink – a Cloud-First Malware Framework In December 2025, Check Point Research identified a small cluster of previously unseen Linux malware samples that appear to originate from a Chinese-affiliated development environment. Many of the binaries included debug symbols and other development artifacts, suggesting we were looking at in-progress builds rather than a finished, […] The post Unveiling VoidLink – A Stealthy, Cloud-Native Linux Malware Framework appeared first on Check Point Research .
Key takeaways Introduction GoBruteforcer is a botnet that turns compromised Linux servers into scanning and password brute-force nodes. It targets internet-exposed services such as phpMyAdmin web panels, MySQL and PostgreSQL databases, and FTP servers. Infected hosts are incorporated into the botnet and accept remote operator commands.  Newly discovered weak credentials are used to steal data, […] The post Inside GoBruteforcer: AI-Generated Server Defaults, Weak Passwords, and Crypto-Focused Campaigns appeared first on Check Point Research .
Participants earned rewards at the hacking competition for Grafana, Linux Kernel, Redis, MariaDB, and PostgreSQL vulnerabilities. The post $320,000 Paid Out at Zeroday.Cloud for Open Source Software Exploits appeared first on SecurityWeek .
Security firms have seen cryptocurrency miners, Linux backdoors, botnet malware, and various post-exploitation implants in React2Shell attacks. The post Wide Range of Malware Delivered in React2Shell Attacks appeared first on SecurityWeek .
Published: 2025-12-02 Updated: 2026-03-25 Reference: CVE-2025-40018 2026-03-25 Update: Added patch versions for Ubuntu nodes with GKE. 2025-12-11 Update: Added patch versions and a severity rating for GDC (VMware). GKE Updated: 2026-03-25 Description Severity The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes: CVE-2025-40018 GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN . Clusters using GKE Sandbox aren't impacted. What should I do? 2026-03-25 Update : The following versions of GKE are updated with code to fix this vulnerability on Ubuntu. Upgrade your Ubuntu node pools to the following versions or later: 1.35.1-gke.1396000 1.34.4-gke.1047000 1.33.8-gke.1026000 1.32.12-gke.1026000 1.31.14-gke.1336000 1.30.14-gke.1991000 The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later: 1.32.9-gke.1330000 1.29.15-gke.2236000 1.30.14-gke.1525000 1.31.13-gke.1231000 1.34.1-gke.2541000 1.28.15-gke.2966000 1.33.5-gke.1350000 You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel . High GDC (VMware) Updated: 2025-12-11 Description Severity The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes: CVE-2025-40018 What should I do? The following versions of GDC (VMware) are updated with code to fix this vulnerability. Upgrade your GDC (VMware) clusters to the following versions or later: 1.31.1100-gke.40 Note: Patch versions and a severity assessment for GDC software for VMware are in progress. We'll update this bulletin with that information when it's available. High GKE on AWS Description Severity The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes: CVE-2025-40018 What should I do? Note: Patch versions and a severity assessment for GKE on AWS are in progress. We'll update this bulletin with that information when it's available. Pending GKE on Azure Description Severity The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes: CVE-2025-40018 What should I do? Note: Patch versions and a severity assessment for GKE on Azure are in progress. We'll update this bulletin with that information when it's available. Pending GDC (bare metal) Description Severity The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes: CVE-2025-40018 What should I do? There is no action required. GDC software for bare metal isn't affected as it does not bundle an operating system in its distribution. None
'The Gentlemen' ransomware group, active since July 2025, operates a Ransomware-as-a-Service (RaaS) platform that employs advanced dual-extortion tactics by encrypting data and exfiltrating sensitive information to coerce ransom payments. Their ransomware targets Windows, Linux, and ESXi platforms, encrypting both local and network-shared drives using strong cryptographic algorithms XChaCha20 and Curve25519. Recent updates include automatic self-restart, run-on-boot persistence, configurable encryption speeds, and attack methods, enhancing their operational resilience and adaptability. The group has publicly disclosed 47 victims within two months, indicating rapid propagation and impact. The malware leverages multiple MITRE ATT&CK techniques such as persistence (T1547.001), data encryption (T1486), and network share discovery (T1135). No known exploits or CVEs are associated yet, but the threat is significant due to its multi-platform support and dual-extortion approach. European organizations with mixed OS environments and ESXi virtualization are at particular risk. Mitigation requires tailored detection of persistence mechanisms, network segmentation, and robust incident response plans. Countries with high adoption of VMware ESXi and diverse enterprise IT infrastructures, such as Germany, France, and the UK, are likely most affected.
Arbitrary command/code execution has been demonstrated through the exploitation of CVE-2025-11953 on Windows, macOS and Linux. The post Critical Flaw in Popular React Native NPM Package Exposes Developers to Attacks appeared first on SecurityWeek .
This threat involves attackers using memory-only filesystems (tmpfs) on Linux systems, such as /dev/shm, to hide malicious tools or stage data exfiltration. Traditional forensic imaging tools cannot capture these volatile filesystems because they lack block device backing. The analyst describes a method to collect both metadata and file contents from these tmpfs mounts by first extracting inode metadata using stat commands and then archiving file contents with tar, preserving forensic integrity. This technique has been tested successfully on numerous Linux and Unix-like systems. The threat highlights the challenge of detecting and collecting evidence from in-memory filesystems that attackers exploit to evade detection. The severity is medium due to the difficulty in forensic collection and potential for attackers to hide artifacts in tmpfs, but exploitation requires system access. European organizations running Linux servers with tmpfs mounts are at risk of stealthy attacks leveraging this technique.
A Linux kernel vulnerability (CVE-2024-58240) affecting Container-Optimized OS nodes in Google Kubernetes Engine (GKE) clusters can lead to privilege escalation. This impacts GKE Standard and Autopilot clusters but not those using GKE Sandbox. Patch versions have been released for Ubuntu node pools and Container-Optimized OS node pools across multiple GKE versions. GDC software for VMware is also affected and patched. GKE on AWS and Azure patch details are pending. Bare metal GDC software is not affected and requires no action.
Google Threat Intelligence Group (GTIG) is tracking BRICKSTORM malware activity, which is being used to maintain persistent access to victim organizations in the United States. Since March 2025, Mandiant Consulting has responded to intrusions across a range of industry verticals, most notably legal services, Software as a Service (SaaS) providers, Business Process Outsourcers (BPOs), and Technology. The value of these targets extends beyond typical espionage missions, potentially providing data to feed development of zero-days and establishing pivot points for broader access to downstream victims.
Gunra Ransomware is a double extortion group targeting global victims, excluding the US. They primarily attack Windows systems, recently expanding to Linux. The group uses phishing as their main vector and negotiates through a WhatsApp-themed chat panel. They can encrypt large files quickly using advanced stream ciphers. The Data Leak Site has undergone several changes, including a brief clearweb presence. Victims span multiple countries and industries, with South Korea, Brazil, and Japan topping the list. The ransomware shares code similarities with Conti and Akira, but newer versions appear unique. Negotiations reveal ambitious ransom demands, sometimes unrealistic. The group employs various evasion techniques and uses multiple MITRE ATT&CK tactics.
ZynorRAT is a newly discovered Go-based Remote Access Trojan that provides a full suite of command and control capabilities for Linux and Windows systems. It was first identified in July 2025 and is believed to be of Turkish origin. The malware uses Telegram as its C2 infrastructure and offers features such as file exfiltration, system enumeration, screenshot capture, persistence through systemd services, and arbitrary command execution. The Linux version is fully functional, while the Windows version appears to be in early development. The malware's author seems to be actively working on improving its detection avoidance. ZynorRAT's capabilities include discovery, exfiltration, persistence, and remote code execution on victim machines.
