// #unpatched
6 articles
Linux 'Dirty Frag' Zero-Day Chains Two Kernel Flaws for Deterministic Root — PoC Published, No Patch
Security researchers have published a proof-of-concept exploit for a new Linux kernel local privilege escalation vulnerability chain nicknamed Dirty Frag, which combines flaws in the xfrm-ESP and RxRPC page-cache subsystems to reliably achieve root access from an unprivileged user process. Unlike its predecessor CopyFail, Dirty Frag is deterministic — it does not rely on race conditions and succeeds reliably across Ubuntu, RHEL, CentOS Stream, AlmaLinux, openSUSE, and Fedora. No CVE ID or kernel patch has been issued at time of disclosure.
PhantomRPC — Unpatched Windows Privilege Escalation Technique Abuses COM Server Activation
Security researchers have disclosed PhantomRPC, an unpatched local privilege escalation technique in Windows that abuses the COM server activation mechanism to elevate from standard user to SYSTEM without triggering standard EDR alerts. Microsoft has acknowledged the report but not committed to a patch timeline. Defenders should implement mitigation controls; red teams should incorporate this technique into assessments.
Hugging Face LeRobot CVE-2026-25874 — Critical Unpatched RCE via Pickle Deserialization in Unauthenticated gRPC Endpoint
A critical unpatched remote code execution vulnerability in Hugging Face's LeRobot robotics AI framework allows unauthenticated attackers to execute arbitrary code on any server running the gRPC control interface. CVE-2026-25874, rated CVSS 9.3, affects the project's dataset loading and remote control pipeline via Python pickle deserialization. No patch is available; mitigations focus on network isolation.
Two Unpatched Windows Defender Zero-Days (RedSun + UnDefend) Actively Exploited — No Fix Available
A security researcher released two additional Windows Defender zero-days — RedSun and UnDefend — after Microsoft failed to patch them. RedSun exploits Defender's cloud file rollback mechanism to achieve SYSTEM privileges on all supported Windows versions. UnDefend silently prevents Defender from updating its threat signatures. Both are confirmed exploited in the wild, and neither has a patch or assigned CVE.
Five-Year-Old ShowDoc RCE Flaw CVE-2025-0520 (CVSS 9.4) Now Under Active Exploitation — Over 2,000 Instances Exposed
Threat actors are actively exploiting CVE-2025-0520, a critical unauthenticated remote code execution vulnerability in ShowDoc — an IT documentation tool used by developers and operations teams. The flaw, patched in October 2020 but present in thousands of unupgraded installations, allows file upload exploitation to deploy web shells. More than 2,000 publicly accessible ShowDoc instances remain vulnerable.
BlueHammer Windows LPE Zero-Day Gives Attackers SYSTEM Access — No Patch Available
A publicly disclosed zero-day local privilege escalation vulnerability in Windows Defender's signature-update mechanism allows any authenticated user to escalate to SYSTEM. Named BlueHammer by researchers at Cyderes, the flaw has a working public exploit and no Microsoft patch as of publication. Security teams should implement interim mitigations immediately.