Critical: Red Hat Security Advisory: kernel security, bug fix, and enhancement update

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On. Red Hat Product Security has rated this update as having a security impact of Critical. A Common Vulnerability...

ROOT-OS-UBUNTU-2404-CVE-2025-21858 CVE-2025-21858 in rootio-linux - Patched by Root

Root has patched CVE-2025-21858 in the rootio-linux package for Root:Ubuntu:24.04. Multiple fixed versions available...

RHEL 8 : kernel-rt (RHSA-2026:25120)

The remote Redhat Enterprise Linux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the RHSA-2026:25120 advisory. The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism...

AlmaLinux 8 : kernel-rt (ALSA-2026:25120)

The remote AlmaLinux 8 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALSA-2026:25120 advisory. kernel: geneve: Fix use-after-free in genevefinddev. CVE-2025-21858 kernel: smc: Fix use-after-free in tcpwritetimerhandler CVE-2023-53781 kernel: nbd:...

Oracle Linux 8 : kernel (ELSA-2026-23258)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-23258 advisory. - smb: client: reject userspace cifs.spnego descriptions Paulo Alcantara RHEL-178938 CVE-2026-46243 - smb: client: fix OOB reads parsing symlink error response...

cve-2026-poc-collection

CVE-2026 PoC Collection Report Collection date: May 19, 2...

n8n arbitrary file read

This module exploits CVE-2026-21858, a critical unauthenticated remote code execution vulnerability in n8n workflow automation platform versions 1.65.0 through 1.120.x. The vulnerability, dubbed "Ni8mare", is a content-type confusion flaw in webhook request handling that allows attackers to achie...

Exploit for Improper Input Validation in N8N

🛡️ RulesGuard !Testshttps://github.com/NOTTIBOY137/RulesG...

Exploit for Improper Input Validation in N8N

CVE-2026-21858 n8n Workflow Automation Platform - Remote C...

Exploit for CVE-2026-21858

🔒 Ni8mare Scanner Ethical Security Scanner for CVE-2026-218...

CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker,...

CVE-2026-21858 n8n Vulnerable to Unauthenticated File Access via Improper Webhook Request Handling

n8n is an open source workflow automation platform. Versions starting with 1.65.0 and below 1.121.0 enable an attacker to access files on the underlying server through execution of certain form-based workflows. A vulnerable workflow could grant access to an unauthenticated remote attacker,...

CVE-2026-21858

creationtimestamp| type| source ---|---|--- 2026-01-07 12:48:00+00:00| seen| https://thehackernews.com/2026/01/critical-n8n-vulnerability-cvss-100.html 2026-01-07 15:20:10+00:00| seen| https://bsky.app/profile/cybersentinel404.bsky.social/post/3mbtrdz5mxv24 2026-01-07 15:20:49+00:00|...

CVE-2025-21858

creationtimestamp| type| source ---|---|--- 2025-08-13 09:00:05+00:00| seen| https://bsky.app/profile/bluesky.awakari.com/post/3lwbhky6biw2y...

EulerOS 2.0 SP10 : kernel (EulerOS-SA-2025-1777)

According to the versions of the kernel packages installed, the EulerOS installation on the remote host is affected by the following vulnerabilities : drm/plane: Move range check for formatcount earlierCVE-2021-47659 traceeventshist: add check for return value of 'createhistfield'CVE-2023-53005...

Important: kernel-livepatch-5.10.234-225.921

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: geneve: Fix use-after-free in genevefinddev. CVE-2025-21858 Affected Packages: kernel-livepatch-5.10.234-225.921 Issue Correction: Please ensure you have live patching enabled. Run yum update...

CVE-2025-21858 affecting package kernel for versions less than 5.15.179.1-1

CVE-2025-21858 affecting package kernel for versions less than 5.15.179.1-1. A patched version of the package is available...

Amazon Linux AMI : kernel (ALAS-2025-1973)

The version of kernel installed on the remote host is prior to 4.14.355-196.639. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS-2025-1973 advisory. A use-after-free flaw was found in btrfssearchslot in fs/btrfs/ctree.c in btrfs in the Linux Kernel.This flaw allow...

Amazon Linux 2 : kernel (ALAS-2025-2843)

The version of kernel installed on the remote host is prior to 4.14.355-276.639. It is, therefore, affected by multiple vulnerabilities as referenced in the ALAS2-2025-2843 advisory. In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flushworkqueue...

Important: kernel

Issue Overview: In the Linux kernel, the following vulnerability has been resolved: nbd: Fix NULL pointer in flushworkqueue CVE-2021-46981 A use-after-free flaw was found in btrfssearchslot in fs/btrfs/ctree.c in btrfs in the Linux Kernel.This flaw allows an attacker to crash the system and...