Critical Linux kernel vulnerability (CVE-2025-21813) affects Ubuntu 24.10 & 24.04 LTS—patch now to prevent system crashes & security breaches. Learn which kernel packages need updating for AWS, GCP, Oracle Cloud, and Raspberry Pi systems.
Severe Vulnerability Discovered in Linux Kernel (CVE-2025-21813)
A newly identified security flaw in the Linux kernel poses a serious risk to Ubuntu 24.10, Ubuntu 24.04 LTS, and their derivatives. This vulnerability, tracked as CVE-2025-21813, affects multiple kernel subsystems, including the Timer subsystem, and could allow attackers to crash or compromise affected systems.
Affected Systems Include:
Ubuntu 24.10 (Mantic Minotaur)
Ubuntu 24.04 LTS (Noble Numbat)
Cloud & Enterprise Variants (AWS, GCP, Oracle, Raspberry Pi, Low Latency Kernels)
Why This Linux Kernel Update is Critical
Linux powers millions of servers, cloud instances, and IoT devices worldwide. A flaw in its core components can lead to:
✔ System instability & crashes
✔ Potential privilege escalation attacks
✔ Disruptions in cloud infrastructure (AWS, GCP, Oracle Cloud)
High-Risk Environments:
Enterprise cloud deployments
Data centers running Ubuntu Server
Raspberry Pi-based IoT devices
Low-latency systems (financial trading, real-time analytics)
Patch Details & Update Instructions
Affected Linux Kernel Packages
| Kernel Variant | Ubuntu 24.10 | Ubuntu 24.04 LTS |
|---|---|---|
| Generic | linux-image-6.11.0-25-generic | linux-image-generic-hwe-24.04 |
| AWS | linux-image-aws | – |
| Google Cloud (GCP) | linux-image-gcp | linux-image-gcp-hwe-24.04 |
| Oracle Cloud | linux-image-oracle | – |
| Raspberry Pi | linux-image-raspi | – |
| Low Latency | linux-image-lowlatency | linux-image-lowlatency-hwe-24.04 |
How to Apply the Security Fix
Run the update command:
sudo apt update && sudo apt upgrade -yReboot your system to load the patched kernel.
Recompile third-party kernel modules (if applicable).
⚠ Warning: Due to an ABI change, some custom kernel modules may require reinstallation.
Security Implications & Best Practices
This vulnerability highlights the importance of:
✔ Regular system updates for Linux servers
✔ Monitoring kernel-level exploits in cloud environments
✔ Using enterprise-grade security tools (IDS/IPS, SIEM solutions)
For IT Administrators:
Schedule emergency patching for critical systems.
Verify kernel version compliance across your infrastructure.
Additional References & Resources
🔗 Official Ubuntu Security Notice: USN-7489-1
🔗 CVE Database Entry: CVE-2025-21813
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