Critical PwnEscape Linux Kernel Vulnerability Lets Guest VMs Read Host Memory · 3h ThreatsDay: Adobe RCE, DNS Wallet Theft, NVIDIA Container Escape, Self-Healing Backdoor + 23 More · 5h Silent Lynx Exploits WinRAR Flaw to Deploy Reverse Shell in CIS Government Attacks · 8h NGINX Fixes 5 Flaws, Including Possible RCE and a TLS Bug That May Skip Client-Cert Checks · 11h Next.js Ships Out-of-Band Patch for Two Critical RCE Flaws in Caching and SVG Processing · 11h Drupal Patches Critical Core RCE Flaw with No-Login Path via Contributed Modules · 12h Vulnerability in Sparx Systems Enterprise Architect software · 12h Curl verhelpt 'high' RCE-kwetsbaarheid gevonden door Anthropic · 12h Vulnerabilities in Slican telephone exchanges · 13h Palo Alto Networks waarschuwt voor misbruik van beveiligingslek in firewalls · 16h Critical PwnEscape Linux Kernel Vulnerability Lets Guest VMs Read Host Memory · 3h ThreatsDay: Adobe RCE, DNS Wallet Theft, NVIDIA Container Escape, Self-Healing Backdoor + 23 More · 5h Silent Lynx Exploits WinRAR Flaw to Deploy Reverse Shell in CIS Government Attacks · 8h NGINX Fixes 5 Flaws, Including Possible RCE and a TLS Bug That May Skip Client-Cert Checks · 11h Next.js Ships Out-of-Band Patch for Two Critical RCE Flaws in Caching and SVG Processing · 11h Drupal Patches Critical Core RCE Flaw with No-Login Path via Contributed Modules · 12h Vulnerability in Sparx Systems Enterprise Architect software · 12h Curl verhelpt 'high' RCE-kwetsbaarheid gevonden door Anthropic · 12h Vulnerabilities in Slican telephone exchanges · 13h Palo Alto Networks waarschuwt voor misbruik van beveiligingslek in firewalls · 16h

ACyber Sentinel Security Assessment Team

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⚠️ Vulnerability Report

CVE-2026-99999

CRITICAL CVSS 9.3 CVSS 3.1 📌 Received

CVE-2026-99999 - ipv4: validate checksum_start before completing checksum

In the Linux kernel, the following vulnerability has been resolved:

ipv4: validate checksum_start before completing checksum

If a packet with bad checksum metadata gets into the ipv4 stack,

skb_checksum_help can corrupt the network header and cause a bunch of

mischief.

This was discovered and reported by Paulos, and has been reporoduced

by others independently since.

We really shouldn't allow such packets in, but as a defence

in depth measure, let's also check before we complete the checksum.

A more complete validation at input is forthcoming, but needs more work.

Published: Oct 15, 2026 13:17

Last Modified: Oct 15, 2026 23:19