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Researchers Demonstrate OpenBSD Root Exploit Chaining 37-Year-Old Shared-Memory Bug

A local privilege escalation exploit published today gains root on OpenBSD 7.9 by chaining a roughly 37-year-old integer overflow with a separate kernel flaw, bypassing OpenBSD's KARL kernel-address randomization and its SMAP and SMEP hardware protections.Security firm Calif, which found and reported the flaws, published a detailed writeup and full proof-of-concept code after OpenBSD shipped

CVE-2026-102551 & CVE-2026-102552 - Issue with FreeRTOS-Plus-TCP

Bulletin ID: 2026-139-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/16/2026 10:15 AM PDT Description: FreeRTOS-Plus-TCP is an open-source, thread-safe TCP/IP stack for the FreeRTOS kernel, distributed by Amazon for use on embedded and IoT devices. AWS identified two issues with FreeRTOS-Plus-TCP, affecting multiple versions. CVE-2026-102551: improper verification of the source of a communication channel in the IPv6 Router Advertisement handler. The handler doe…

CVE-2026-109587 & CVE-2026-109588 - Issue with FreeRTOS-Kernel

Bulletin ID: 2026-138-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/16/2026 10:00 AM PDT Description: FreeRTOS-Kernel is a real-time operating system kernel for microcontrollers and small microprocessors, distributed by Amazon. AWS identified two issues with the FreeRTOS-Kernel Arm Cortex-R82 (Armv8-R AArch64) MPU port, affecting multiple versions. CVE-2026-109587: incorrect authorization in the Arm Cortex-R82 MPU port. On MPU-enabled builds, the port does not…

ZDI-26-785: FreeBSD Kernel Shared Memory Time-Of-Check Time-Of-Use Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of FreeBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 7.8. The following CVEs are assigned: CVE-2026-58094.

ZDI-26-784: FreeBSD Kernel kqueue Use-After-Free Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of FreeBSD Kernel. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The ZDI has assigned a CVSS rating of 8.8. The following CVEs are assigned: CVE-2026-58093.

AI-Powered Espionage Campaign Targets Government Linux Infrastructure

Our analysis an AI-powered espionage campaign targeting government Linux infrastructure with custom malware, web shells, and advanced credential theft. The post AI-Powered Espionage Campaign Targets Government Linux Infrastructure appeared first on Unit 42.

Critical PwnEscape Linux Kernel Vulnerability Lets Guest VMs Read Host Memory

A newly disclosed critical flaw in the Linux kernel allows code inside a virtual machine to read memory on the host computer it runs on. A researcher demonstrated the leak against Vercel's live cloud sandboxes, and Vercel confirmed it. The flaw, now tracked as CVE-2026-99999 and nicknamed PwnEscape, is in the Linux kernel's networking code, not in any one cloud's setup, so it reaches the shared

Issue in the Linux kernel virtio-net/TAP networking path affecting KVM-based hypervisors

Bulletin ID: 2026-137-AWS Scope: AWS Content Type: Important (requires attention) Publication Date: 10/15/2026 10:30 AM PDT Description: AWS is aware of an issue in the Linux kernel's virtio-net/TAP networking path (CVE-2026-99999) that affects KVM-based hypervisors running unpatched Linux kernel versions 4.4 through 6.18. This issue could allow an actor with privileged access inside a guest virtual machine to send specially crafted network packets that corrupt host kernel memory that could res…

Fake Arch Linux packages push malware with root privileges

A threat actor uploaded malicious packages to the Arch User Repository (AUR) that impersonated two popular helper tools, yay and paru. [...]

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

Dirty Frag and other issues in Amazon Linux kernels

AI-Found Linux Kernel Flaw Gives Local Users Root, and Can Break a Guest Out to the Host

A flaw in Linux's vhost subsystem lets a local user read and write kernel memory at will and become root across nearly a decade of kernel versions. In one virtualization setup, it lets an untrusted virtual machine write to the host's memory and hijack the program that runs the virtual machine. The bug is tracked as CVE-2026-74580 and named Vghost. Tencent Zhuque Lab, which found the

CVE-2026-97229: Critical Unauthenticated Remote Code Execution in GitLab

OverviewOn October 12, 2026, GitLab published a critical patch release for CVE-2026-97229, an integer overflow or wraparound (CWE-190) in the CI/CD regular expression compiler affecting GitLab Community Edition (CE) and Enterprise Edition (EE). GitLab assigned the vulnerability a CVSSv3.1 score of 10.0. Under certain conditions, a remote attacker can execute arbitrary code on an affected GitLab server through a specially crafted regular expression stored in a malicious CI/CD configuration. Whil…

Canonical Hit by Second DDoS Attack in 2026, Public Websites Disrupted

Canonical suffered its second DDoS attack this year, disrupting public websites for over four hours while Launchpad and the Snap Store remained online. Ubuntu’s parent company Canonical spent part of last week fighting off a sustained distributed denial of service (DDoS) attack, the second one to hit its infrastructure this year. The company revealed the […]

Canonical Websites Disrupted in Second DDoS Attack This Year

The outage hit the main Ubuntu and Canonical websites, including the Ubuntu blog and developer portal. The post Canonical Websites Disrupted in Second DDoS Attack This Year appeared first on SecurityWeek.

SECURITY AFFAIRS MALWARE NEWSLETTER ROUND 118

Security Affairs Malware newsletter includes a collection of the best articles and research on malware in the international landscape Malware Newsletter ClingSTUN Linux Backdoor Abuses Public STUN Infrastructure UAC-0277: ClickFix on compromised websites to spread LUNEXSTEALER MALFEX – A malicious npm postinstall no advisory has caught for fourteen months Canto incognito: tracking the PoeLLM malware […]

Researchers Publish Working Exploit for Pre-Auth AnyDesk Linux Flaw That Gives Root Access

Security researchers have published a full working exploit for a pre-authentication remote code execution flaw in AnyDesk Linux that gives attackers root access before anyone approves the connection. AnyDesk patched the flaw in version 8.0.3 in June, but its changelog described the fix only as "fixed a bug that could lead to a crash," with no CVE assigned and no security

3 lessons from frontier AI vulnerability research

Read how How Microsoft Security's FORGE Lab is scaling vulnerability research from Windows to the Linux kernel. The post 3 lessons from frontier AI vulnerability research appeared first on Microsoft Security Blog.

Linux Backdoors Impersonate Email Security Tools to Evade Detection in Korea and Taiwan

Linux backdoors targeting telecom and network appliances in South Korea and Taiwan have been disguising their traffic as email services and seemingly legitimate processes to blend in and evade detection. Threat actors are known to name their malicious software after a legitimate operating system component or a process as a defense evasion measure. By borrowing the name of a real binary, it may

ClingSTUN Linux Backdoor Abuses Public STUN Infrastructure

Fortinet details ClingSTUN, a Linux backdoor exploiting unpatched IoT devices and abusing public STUN servers to route traffic past NAT. FortiGuard Labs researchers spotted a Linux malware family they call ClingSTUN, and the name gives away its trick immediately. Instead of relying on a dedicated command server, the malicious code leans on STUN, the protocol […]

ClingSTUN Turns Vulnerable IoT Devices Into Proxy Nodes

The Linux backdoor exploits 24 known flaws to compromise IoT devices and uses legitimate public STUN servers to obscure communications.

Linux Backdoor Abuses STUN Protocol, Exploits Dozens of Flaws

ClingSTUN operates as a back-connect proxy backdoor, sets up persistence, and contains exploits for self-propagation. The post Linux Backdoor Abuses STUN Protocol, Exploits Dozens of Flaws appeared first on SecurityWeek.

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.

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. [...]