A newly analyzed Linux malware sample, dubbed Tengu, combines Mirai-style botnet tradecraft with broad persistence, DDoS, SSH probing, and proxy capabilities. The stripped 32-bit ELF masquerades as a Linux kernel worker process while targeting servers, embedded devices, and IoT-adjacent systems. It has no symbols, uses NX protection and partial RELRO, and carries a SHA-256 hash […]

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A proof-of-concept (PoC) has been released for a use-after-free vulnerability affecting the Linux kernel’s software bridge implementation found in `net/bridge`. This vulnerability occurs within the Spanning Tree Protocol (STP) timer lifecycle. It can result in timer structures referencing freed bridge memory, potentially allowing for control-flow hijacking. The SSD Secure Disclosure technical team disclosed the issue […]

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BlackTech, a long-running China-aligned APT group, has adopted a new Linux backdoor built on the BlueShell open-source RAT to conduct post-intrusion operations against Japanese organizations, signaling ongoing toolchain evolution and focused targeting of enterprise Linux environments. Originally published on GitHub with Chinese-language documentation, BlueShell has seen limited but consistent abuse by China-based threat actors, including […]

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A covert Monero (XMR) cryptomining campaign uncovered in May 2026 is abusing Linux Pluggable Authentication Modules (PAM) to evade detection, maintain fileless execution, and persist across multiple user accounts on compromised hosts. The operation, tracked as part of the V25 (Generation 26) campaign family, demonstrates a mature blend of supply chain abuse, PAM weaponization, and […]

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