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CISA Adds Linux Root Access Bug CVE-2026-31431 to Known Exploited Vulnerabilities List

CISA Adds Linux Root Access Bug CVE-2026-31431 to Known Exploited Vulnerabilities List

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a significant security flaw, CVE-2026-31431, affecting various Linux distributions to its Known Exploited Vulnerabilities (KEV) catalog. This vulnerability, known as a local privilege escalation (LPE) flaw, allows an unprivileged local user to gain root access. The flaw, also referred to as Copy Fail, was introduced through changes to the Linux kernel in 2011, 2015, and 2017. It impacts Linux distributions shipped since 2017 and can be exploited by corrupting the kernel's in-memory page cache, allowing attackers to inject code into privileged binaries. The flaw poses a serious risk to containerized environments, such as Docker and Kubernetes, due to the potential for breaching container isolation. The vulnerability is actively being exploited, with a fully working exploit proof-of-concept available. CISA has advised federal agencies to apply fixes by May 15, 2026.
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CISA Adds Linux Root Access Bug CVE-2026-31431 to Known Exploited Vulnerabilities Catalog

CISA Adds Linux Root Access Bug CVE-2026-31431 to Known Exploited Vulnerabilities Catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a security flaw affecting various Linux distributions to its Known Exploited Vulnerabilities (KEV) catalog. The vulnerability, identified as CVE-2026-31431, is a local privilege escalation flaw that allows an unprivileged local user to gain root access. This flaw, known as Copy Fail, was introduced through changes to the Linux kernel in 2011, 2015, and 2017. It impacts Linux distributions shipped since 2017 and poses a significant risk to cloud environments, particularly containerized systems like Docker and Kubernetes. The flaw allows attackers to inject code into privileged binaries, potentially breaching container isolation. A fully working exploit proof-of-concept is available, increasing the urgency for mitigation.
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CISA Urges Immediate Linux Update Due to Nine-Year-Old Vulnerability

CISA Urges Immediate Linux Update Due to Nine-Year-Old Vulnerability

CISA Urges Immediate Linux Update Due to Nine-Year-Old Vulnerability
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CISA Urges Immediate Linux Update Due to Critical Security Vulnerability

CISA Urges Immediate Linux Update Due to Critical Security Vulnerability

The U.S. Cybersecurity and Infrastructure Agency (CISA) has issued an urgent warning to Linux users following the discovery of a nine-year-old security vulnerability known as 'Copy Fail.' This vulnerability, identified as CVE-2026-31431, affects every major Linux distribution and allows attackers to gain root access with minimal code. The vulnerability was quickly added to CISA's known exploited vulnerabilities catalog, highlighting its severity. Security researchers from Theori, who discovered the flaw, describe it as a logic bug in the Linux kernel's cryptographic template, which can be exploited to write into the page cache of any readable file. CISA has emphasized the need for immediate updates to mitigate potential cyberattacks.
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AI-Equipped Researcher Uncovers Critical Zero-Day Flaw in Linux Kernel Affecting Multi-User Systems

AI-Equipped Researcher Uncovers Critical Zero-Day Flaw in Linux Kernel Affecting Multi-User Systems

A significant zero-day vulnerability, known as 'Copy Fail', has been discovered in the Linux kernel, affecting systems since 2017. The flaw was identified by Taeyang Lee, a researcher at Theori, using an AI-driven tool called Xint Code. This vulnerability allows an unprivileged local user to execute a controlled write into the page cache of any readable file, potentially leading to root access on affected systems. The Linux kernel security team was notified on March 23, and a patch was developed shortly thereafter. The vulnerability, assigned CVE-2026-31431, poses a high risk to multi-user environments like container clusters. A patch has been released, reverting a 2017 optimization in the kernel's cryptographic template.
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Severe Linux Security Flaw 'Copy Fail' Exposed, Patches Released for Some Distributions

Severe Linux Security Flaw 'Copy Fail' Exposed, Patches Released for Some Distributions

A critical security vulnerability known as 'Copy Fail' has been identified in nearly every Linux distribution released since 2017. The flaw, disclosed as CVE-2026-31431, allows users to gain administrator privileges through a Python script that operates across all affected distributions without requiring specific offsets or recompilation. The vulnerability was discovered by Theori, a security firm, with the aid of their AI tool, Xint Code. The exploit is particularly concerning because it can go undetected by monitoring tools, as it does not mark the page dirty, preventing writeback machinery from flushing modified bytes to disk. While some distributions like Arch Linux, RedHat Fedora, and Amazon Linux have released patches, many others have yet to address the issue.
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CISA Releases Guidance on Secure Adoption of Agentic AI Systems

CISA Releases Guidance on Secure Adoption of Agentic AI Systems

The Cybersecurity and Infrastructure Security Agency (CISA), in collaboration with the Australian Signals Directorate’s Australian Cyber Security Centre and other international and U.S. partners, has released a new guide for organizations on the adoption of agentic artificial intelligence (AI) systems. This guidance addresses key security challenges and risks associated with agentic AI, providing actionable steps for designing, deploying, and operating these systems safely. The guide aims to help organizations align AI risk management with existing cybersecurity frameworks and enhance oversight as the adoption of agentic AI grows.
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Linux Security Flaw 'Copy Fail' Exposes Vulnerabilities in Distributions Since 2017

Linux Security Flaw 'Copy Fail' Exposes Vulnerabilities in Distributions Since 2017

A significant security flaw known as 'Copy Fail' has been identified in nearly every Linux distribution released since 2017. This vulnerability allows users to gain administrator privileges without detection by monitoring tools. The flaw, disclosed as CVE-2026-31431, was discovered by Theori, a security firm, with the help of their AI tool, Xint Code. The exploit uses a Python script that operates across all affected Linux distributions without needing specific adjustments for different versions. The flaw is particularly concerning because it can go unnoticed by tools that monitor on-disk checksums, as it does not mark the page dirty or flush modified bytes back to disk. A patch for the flaw was added to the mainline Linux kernel on April 1st, but not all distributions have released patches yet.
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U.S. Infrastructure Faces New Threats from Civilian Drone and GPS Disruptions

U.S. Infrastructure Faces New Threats from Civilian Drone and GPS Disruptions

The increasing use of drones and GPS technology in civilian life is creating new security challenges, as highlighted by recent developments in electronic warfare. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued guidance for critical infrastructure operators to deploy counter-drone capabilities. This shift reflects a broader trend where technologies initially developed for military use are now impacting civilian sectors. The counter-UAS (Unmanned Aerial Systems) market is projected to reach $20 billion by 2030, driven by the need to protect against potential threats from drones and GPS disruptions. Companies are developing solutions to detect and mitigate these threats, including software that turns existing sensors into electromagnetic detectors and subscription-based civilian counter-drone systems.
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Severe Linux Vulnerability 'CopyFail' Poses Major Security Threat

Severe Linux Vulnerability 'CopyFail' Poses Major Security Threat

Severe Linux Vulnerability 'CopyFail' Poses Major Security Threat
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Exclusive-US officials weigh cutting deadlines to fix digital flaws amid worries over AI-powered hacking, sources say

Exclusive-US officials weigh cutting deadlines to fix digital flaws amid worries over AI-powered hacking, sources say

By Raphael Satter WASHINGTON, May 1 (Reuters) - U.S. cybersecurity officials are considering sharply shorter deadlines for fixing critical flaws in government IT systems, amid concerns hackers could exploit them using artificial‑intelligence tools such as Anthropic’s Mythos, people familiar with the
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cPanel Authentication Bypass Vulnerability Exploited, CISA Issues Warning

cPanel Authentication Bypass Vulnerability Exploited, CISA Issues Warning

A critical authentication bypass vulnerability in cPanel, a widely used web hosting control panel, is being actively exploited. The vulnerability, identified as CVE-2026-41940, affects all supported versions of cPanel and WebHost Manager (WHM) released after version 11.40. Exploitation of this flaw allows attackers to bypass authentication and gain unauthorized access. cPanel has released a patch to address the issue, and the Cybersecurity and Infrastructure Security Agency (CISA) has added the vulnerability to its Known Exploited Vulnerabilities list.