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Critical Linux Kernel Vulnerabilities Expose Cloud Infrastructures to Remote Attacks

Multiple high-severity flaws in the Linux kernel affect major cloud platforms including Azure and GCP. Patches address injection risks and system compromise vectors.

TL;DR

  • Researchers found packet injection vulnerability in WiFi mesh networks (CVE-2025-27558).
  • Dozens of additional CVEs impact core kernel subsystems across multiple architectures.
  • Exploits could lead to system compromise, data leakage, or denial of service.
  • Affects Ubuntu-based cloud images including Azure, GCP FIPS, and Azure CVM instances.
  • Immediate patching recommended for all affected Linux kernel deployments.

A series of critical vulnerabilities have been identified in the Linux kernel that pose significant risks to cloud computing environments. These flaws span numerous subsystems and can potentially allow attackers to inject packets, compromise systems, or cause denial of service.

The most notable issue, CVE-2025-27558, stems from an incomplete fix related to WiFi frame aggregation in mesh networks. Discovered by researchers Siebe Devroe, Héloïse Gollier, and Mathy Vanhoef, this vulnerability allows physically proximate attackers to manipulate network traffic under specific conditions.

Additional vulnerabilities affect key areas such as file systems, network protocols, cryptographic interfaces, and hardware drivers. Many of these issues are exploitable remotely and may result in privilege escalation or full system takeover.

Affected Subsystems and Attack Vectors

  • WiFi implementation vulnerable to packet injection via mesh network frame handling (CVE-2025-27558)
  • Flaws in TCP, SCTP, TIPC, and Multipath TCP protocols enable remote exploitation
  • File system weaknesses in Ext4, OCFS2, and SMB may allow unauthorized access or corruption
  • Networking components including Netfilter, Open vSwitch, and IPv4/IPv6 stacks impacted
  • Hardware driver issues in NVME, InfiniBand, and x86 architecture increase attack surface

Cloud Platform Exposure

  • Ubuntu cloud images for Azure, Azure CVM, and Google Cloud Platform FIPS are affected
  • Shared CVEs across multiple vendor advisories indicate broad infrastructure exposure
  • Kernel versions used in containerized and virtualized environments require immediate attention
  • Legacy fixes like those for CVE-2020-24588 proved insufficient, necessitating further review

Sources

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