Critical Linux Kernel Vulnerabilities Affect Multiple Ubuntu Releases

Severity: High (Score: 74.0)

Sources: Linuxsecurity

Published: 2026-06-05 · Updated: 2026-06-05

Keywords: ubuntu, security, kernel, linux, issue, affects, releases

Severity indicators: issue, rat

Summary

Recent security advisories have revealed multiple vulnerabilities in the Linux kernel affecting various Ubuntu releases, including 22.04 LTS, 20.04 LTS, 18.04 LTS, 25.10, and 24.04 LTS. These vulnerabilities are associated with CVEs published between May 11 and May 28, 2026, including CVE-2026-47333, CVE-2026-47329, and CVE-2026-47330. Attack vectors include improper handling of shared page fragments during socket buffer operations, leading to potential privilege escalation. Users are advised to update their systems to the latest kernel versions to mitigate risks. The advisories emphasize the importance of prompt patching due to the severity of the vulnerabilities. Affected systems include those running on AWS, Azure, and various IoT platforms. Key Points: • Multiple critical vulnerabilities in the Linux kernel affect several Ubuntu versions. • Users should update to the latest kernel versions to mitigate risks from CVEs. • Vulnerabilities include potential privilege escalation due to improper handling of socket buffers.

Detailed Analysis

**Impact** Multiple Ubuntu releases and their derivatives are affected, including Ubuntu 25.10, 24.04 LTS, 22.04 LTS, 20.04 LTS, and 18.04 LTS. The vulnerabilities impact a broad range of sectors using these Linux distributions, especially cloud environments on AWS, Azure, Google Cloud, IBM Cloud, and IoT platforms. The scope includes critical Linux kernel components, potentially affecting millions of systems globally that rely on these kernels for cloud, enterprise, and embedded deployments. Data at risk includes system integrity and potentially sensitive operational data due to privilege escalation and kernel-level exploits. **Technical Details** The vulnerabilities stem from improper handling of shared page fragments during socket buffer operations and other kernel-level flaws. Attack vectors likely involve local privilege escalation and kernel exploitation techniques. Multiple Linux kernel packages across various platforms (AWS, Azure, GCP, IBM, NVIDIA, Oracle, IoT) are affected, with no specific CVE identifiers or malware/tool names provided in the articles. The vulnerabilities affect kernel versions 5.4, 5.15, and 6.17 series, impacting the kernel’s memory management and socket buffer handling. No IOCs or detailed kill chain stages were mentioned. **Recommended Response** Apply the latest Linux kernel updates provided for each Ubuntu release immediately, prioritizing systems running Ubuntu 22.04 LTS, 20.04 LTS, and 25.10 with their respective patched kernel versions (e.g., linux-image-5.15.0-1109 for 22.04, linux-image-5.4.0-1160 for 20.04, linux-image-6.17.0-1017 for 25.10). Reboot systems after patching to ensure kernel updates take effect. Monitor for unusual privilege escalation attempts and kernel-level anomalies. No specific detection signatures or IOCs are available; focus on patch management and system integrity monitoring.

Source articles (3)

Ubuntu 25.10 24.04 LTS Linux Kernel Security Fixes USN-8371 — Linuxsecurity · 2026-06-02
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 25.10 - Ubuntu 24.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux:…
Ubuntu 8388 — Linuxsecurity · 2026-06-04
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - li…
Ubuntu 20.04 18.04 Kernel Moderate Escalation Risks USN-8389 — Linuxsecurity · 2026-06-04
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - li…

Timeline

2026-04-25 — CVE-2026-31676 published: Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
2026-05-08 — CVE-2026-43284 published: Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
2026-05-11 — CVE-2026-43500 published: A critical vulnerability in the Linux kernel was disclosed, affecting various Ubuntu versions.
2026-05-14 — Public exploit for CVE-2026-46300 released: A proof-of-concept exploit appeared on GitHub, lowering the barrier for opportunistic attackers.
2026-05-15 — CVE-2026-46333 published: A vulnerability related to socket buffer operations was published, impacting multiple systems.
2026-05-21 — CVE-2026-43494 published: A security issue affecting the Linux kernel was disclosed, with a proof of concept available shortly after.
2026-05-23 — CVE-2026-43503 published: Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
2026-05-27 — CVE-2026-45998 published: Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
2026-05-27 — CVE-2026-46000 published: Vulnerability assigned a CVE identifier and published in the National Vulnerability Database.
2026-05-28 — Multiple CVEs published: A series of vulnerabilities (CVE-2026-47326, CVE-2026-47327, CVE-2026-47328, CVE-2026-47329, CVE-2026-47330, CVE-2026-47332, CVE-2026-47333, CVE-2026-47334) were disclosed, affecting various Ubuntu re…

CVEs

Related entities

Amazon Web Services (Company)
Google Cloud Platform (Company)
Microsoft Azure (Company)
Nvidia (Company)
Ubuntu (Company)
Google Container Engine (Platform)
IBM Cloud (Platform)
Intel IoT Platforms (Platform)
Intel IoT Real-time Platforms (Platform)
Linux (Platform)
Linux kernel (Platform)
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Oracle Cloud (Platform)
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Raspberry Pi (Tool)