✕

Rewterz Annual Threat Intelligence Report 2025 - Download Now

Request a Demo
Rewterz

Rewterz Threat Advisory – CVE-2021-42340 – Apache Tomcat Vulnerability

October 15, 2021
Rewterz

Rewterz Threat Alert – LokiBot Malware – Active IOCs

October 18, 2021

Rewterz Threat Advisory – CVE-2021-3847 – Linux Kernel Vulnerability

Severity

High

Analysis Summary

CVE-2021-3847 

Linux Kernel could allow a locally authenticated attacker to gain elevated privileges on the system, caused by a flaw in the OverlayFS. By sending a specially-crafted request using the copy_up function, an authenticated attacker could exploit this vulnerability to gain elevated privileges as root.

Impact

  • Privilege Escalation

Affected Vendors

  • Linux

Affected Products

  • Linux Kernel

Remediation

Upgrade to the latest version of Linux Kernel, available from the Linux Kernel Web site.

https://www.kernel.org/

Reading this advisory was a good start.

Make it a habit.

Rewterz publishes threat advisories ahead of mainstream cybersecurity media, informed by an AI-Native Autonomous SOC that sees regional threat actor activity in real time. Subscribe to receive each new advisory as it publishes, plus a monthly Middle East threat landscape brief drawn from our own SOC telemetry. For teams evaluating their detection coverage, a 30-minute consultation with a senior analyst is also available, at your pace, when you're ready.

Request a demo