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SMTP is the key: BPFDoor and AVERAT hitting the network edge

OverviewRapid7 tracked a set of Linux samples that blend into the software and device conventions of the telecom environments they target. The set spans a newly observed BPFDoor variant, a BPF Rekoobe build seen against South Korean targets, a dropper, and six builds of a Linux implant we track as AVERAT, deployed against Taiwanese appliances. Additionally, we provide source code details of the Rapid7 BPFDoor controller introduced in our April 2026 blog, Stealthy BPFDoor Variants are a Needle T…

Malicious Linux Implants Mimic Asian Mail Security Products

A trio of newly discovered backdoors walk and quack like legitimate edge solutions, so it's hard to tell they're not.

Fragnesia Local Privilege Escalation report via ESP-in-TCP in the Linux Kernel

Dirty Frag and other issues in Amazon Linux kernels

Microsoft is rolling out Linux container support to WSL

Microsoft is taking Windows Subsystem for Linux beyond just running Linux distributions, as WSL Containers is now generally available. [...]

Signal adds encypted local backup support to iOS, desktop apps

Signal, the secure messaging app, released version 8.30, completing the rollout of its secure backups feature across all supported operating systems (Android, iOS, Linux, macOS, and Windows). [...]

New Spectre-v2 BTR Attack Leaks Linux Memory Despite Existing Defenses

A group of academics from VUSec and Scuola Superiore Sant'Anna have disclosed details of a new Spectre CPU vulnerability variant that affects Just-In-Time (JIT) engines present in web browsers, language runtimes, and the operating system kernel, across multiple CPU vendors. The new Spectre v2 variant has been codenamed Branch Target Reuse (BTR). "The key insight is that, while modern CPUs

New Spectre v2 attack variant leaks Linux root password hash in minutes

A new Branch Target Reuse (BTR) attack has been devised that can recover root password hashes on Intel computers running Linux in 3-5 minutes on average. [...]

New Spectre v2 Variant Exposes Intel, AMD, Arm CPUs to Data Leaks

Branch Target Reuse (BTR) is a new Spectre v2 attack targeting JIT compilers in web browsers, language runtimes, and the operating system kernel The post New Spectre v2 Variant Exposes Intel, AMD, Arm CPUs to Data Leaks appeared first on SecurityWeek.

Defending Against Active Exploitation of Citrix NetScaler ADC and Gateway Appliances

Introduction In late September 2026, Mandiant Consulting and Google Threat Intelligence Group (GTIG) identified active, in-the-wild exploitation of a zero-day vulnerability (CVE-2026-88772) affecting Citrix NetScaler ADC and NetScaler Gateway appliances. We have observed evidence that organizations in North America and Europe in the government, financial services, technology, education, and legal and professional services sectors were likely impacted by this exploitation campaign, which has bee…

In Other News: Clop Leak Site Takeover, Docker Botnet Hunts AI Keys, Water Utility Exposure

Noteworthy stories that might have slipped under the radar: BragJack attack against browser AI assistants, TDengine flaw threatens industrial telemetry uptime, Ubuntu update overhaul. The post In Other News: Clop Leak Site Takeover, Docker Botnet Hunts AI Keys, Water Utility Exposure appeared first on SecurityWeek.

Windows, Linux, Android File Notification Systems Leak User Activity

Researchers show that file-change notification systems can leak keystroke timing, browsing activity, and WhatsApp media events. The post Windows, Linux, Android File Notification Systems Leak User Activity appeared first on SecurityWeek.

Compromised MemTensor Packages Deliver sckit Credential Stealer via npm and PyPI

Unknown threat actors have managed to compromise two legitimate MemTensor packages across the npm and Python Package Index (PyPI) repositories to push a platform-specific Go-based implant dubbed sckit designed for Windows, Linux, and macOS. According to reports from Aikido, SafeDep, Socket, and StepSecurity, the libraries in question below - @memtensor/memos-cloud-openclaw-plugin versions

Exploit Released for Unpatched Ubuntu Linux Flaw Enabling Host-Root Container Escape

A use-after-free in the Linux kernel's AF_UNIX socket subsystem can be used to escape a container and gain root on the host, security firm DepthFirst said in research published September 22. The flaw, tracked as CVE-2026-80521 (CVSS score: 7.8), was fixed upstream on August 6, but Ubuntu has not shipped the patch for its 26.04, 24.04, or 22.04 LTS releases. DepthFirst

New Linux Kernel Flaw Gives ARM64 KVM Guests Read-Write Access to Host Memory

A new flaw in the Linux kernel's KVM virtualization code for ARM64 processors can leave a freed piece of host memory exposed to a guest virtual machine on hosts with nested virtualization enabled. The bug, tracked as CVE-2026-89775, allows a guest to read and write host kernel memory, and the researcher who found it says it can be used to escape the guest and run code on the host machine.

CISA alerts of active exploitation of three Linux kernel flaws

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) is warning that hackers are exploiting three Linux kernel vulnerabilities, one of them rated critical. [...]

Fake LastPass Authenticator Installer Abuses Microsoft-Signed Driver to Kill Antivirus and EDR

A fake LastPass Authenticator installer offered on GitHub installs a Windows kernel driver that shuts off antivirus and other security software before a password stealer runs if a victim downloads and runs it, researchers at LastPass and Delphos Labs said on September 17. Microsoft's own hardware-compatibility program signs the driver, scored zero detections on VirusTotal when researchers

Fake LastPass Installers Push Kernel-Level EDR Killer, ‘Rapuncel’ Stealer

The attackers impersonate at least 40 companies and disable 145 security products to deploy infostealer malware. The post Fake LastPass Installers Push Kernel-Level EDR Killer, ‘Rapuncel’ Stealer appeared first on SecurityWeek.

Organizations Warned of 3 Exploited Linux Kernel Vulnerabilities

Attackers could exploit the flaws to cause denial-of-service conditions, disclose memory, or modify memory. The post Organizations Warned of 3 Exploited Linux Kernel Vulnerabilities appeared first on SecurityWeek.

U.S. CISA adds Linux Kernel flaws to its Known Exploited Vulnerabilities catalog

U.S. Cybersecurity and Infrastructure Security Agency (CISA) adds Linux Kernel flaws to its Known Exploited Vulnerabilities catalog. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) added [1, 2] the following vulnerabilities to its Known Exploited Vulnerabilities (KEV) catalog: Below are detailed descriptions of the flaws: At the time of this writing, there are currently no details on how the […]

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 115

Security Affairs Malware newsletter includes a collection of the best articles and research on malware in the international landscape Malware Newsletter Gray Rabbits and the Tale of a One-Click Backdoor Red Heron exploits Gitea n-day flaw in multinational campaign, exposing new Linux rootkit Malicious Twitch Browser Extension Exposes 30,000 Users’ OAuth Tokens to Russian Bot […]

Public Exploits Released for Four Linux Kernel Flaws That Enable Local Root

A security researcher has released working exploit code for four Linux kernel flaws that each let a local user gain root, the highest level of access on a machine. Kernel maintainers have fixed all four over the past few weeks, so a system running an up-to-date kernel is not affected. But the exploit code is now public, and any machine still running an older kernel should be updated. The flaws

ZDI-26-715: Linux Mint Xreader PDF File Parsing Type Confusion Remote Code Execution Vulnerability

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Mint Xreader. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-19772.

BambooToken: The Malware That Speaks MQTT to Stay Under the Radar

Lumen exposes BambooToken, a stealthy malware family using MQTT and sideloading to quietly infect targets across Asia and beyond. BambooToken is a new malware family that uses MQTT, a lightweight messaging protocol commonly found in smart devices and industrial systems, to quietly control infected Windows and Linux machines. Most malware connects directly to a command-and-control […]

Acronis cPanel Backup Plugin Vulnerability Exploited in Targeted Attacks

Acronis has warned that a high-severity security flaw in its Backup plugin for cPanel and Web Host Manager (WHM) deployments has been exploited in the wild. The vulnerability, tracked as CVE-2026-87886 (CVSS score: 7.8), is described as a case of local privilege escalation due to insecure file permissions. It affects the following versions - Acronis Backup plugin for cPanel & WHM (Linux

Cyber Op Targets South Korean Media & Automotive Sectors

A likely North Korean advanced persistent threat (APT) group used a previously undocumented Linux espionage toolkit to compromise load balancers, gain access to communications, and further exploit networks.