Critical Linux kernel vulnerabilities (CVE-2024-8805, CVE-2025-39735) patched for Azure FIPS systems. Learn urgent update steps, reboot requirements, and how Ubuntu Pro extends security for enterprises. Mitigate Bluetooth, GPU, and network driver exploits now.
Publication Date: June 24, 2025
Overview
The Linux kernel for Microsoft Azure Cloud systems with FIPS compliance has been updated to address multiple high-severity security vulnerabilities.
These flaws could allow attackers to execute arbitrary code, escalate privileges, or compromise sensitive data. Enterprises relying on Azure’s FIPS-certified infrastructure must apply these patches immediately to mitigate risks.
Key Security Updates & Vulnerabilities
1. Bluetooth Driver Exploit (CVE-2024-8805)
Discovered by Michael Randrianantenaina, this improper access control flaw in the Linux kernel’s Bluetooth stack allows nearby attackers to:
Pair rogue devices without authentication
Potentially execute malicious code on vulnerable systems
Bypass FIPS-validated encryption protections
Affected Systems:
Ubuntu 22.04 LTS (Jammy Jellyfish)
Linux Azure FIPS Kernel (v5.15.0-1091.100+fips1)
2. Additional High-Risk Vulnerabilities Patched
This update resolves critical flaws across multiple subsystems, including:
PowerPC & x86 architecture (Privilege escalation risks)
ACPI & GPU drivers (Kernel memory corruption)
Mellanox & Network drivers (Remote denial-of-service)
SCSI & InfiniBand (Data integrity bypass)
Full CVE List:
CVE-2025-39735 (Remote Processor Subsystem)
CVE-2025-38637 (Media Drivers)
Urgent Update Instructions
Step 1: Apply Standard System Update
sudo apt update && sudo apt upgrade -y
Step 2: Reboot & Recompile Kernel Modules
⚠️ Critical Note: Due to an ABI break, you must:
Reinstall third-party kernel modules (e.g., NVIDIA drivers, VPN tools)
Reboot immediately to activate fixes
Ubuntu Pro Users: Extend security coverage to 25,000+ packages for 10 years (free for 5 machines).
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Why This Matters for Enterprises
Azure FIPS compliance is mandatory for government, healthcare, and financial sectors
Unpatched kernels risk regulatory penalties (HIPAA, PCI DSS, FedRAMP)
Mellanox & GPU driver flaws impact AI/ML workloads in cloud environments
FAQ: Linux Kernel Security Patches
Q: How do I verify my kernel version?
uname -r
(Should return 5.15.0-1091.100+fips1 or higher)
Q: Can I delay the reboot?
No. Memory corruption flaws (CVE-2025-38152) allow attackers to persist in RAM.
Q: Does Ubuntu Pro cover third-party drivers?
Yes, including NVIDIA, Broadcom, and proprietary modules.
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