Explore

Rapid Read Rapid Read
CISA Warns of 'Copy Fail' Flaw Exploitation in Linux Systems, Urges Immediate Patching

CISA Warns of 'Copy Fail' Flaw Exploitation in Linux Systems, Urges Immediate Patching

The Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning regarding the active exploitation of a security vulnerability known as 'Copy Fail' in Linux systems. This flaw, tracked as CVE-2026-31431, was disclosed by Theori researchers, who also provided a proof-of-concept exploit. The vulnerability exists in the Linux kernel's algif_aead cryptographic algorithm interface, allowing unprivileged local users to gain root privileges on unpatched systems. The exploit affects multiple Linux distributions, including Ubuntu 24.04 LTS, Amazon Linux 2023, RHEL 10.1, and SUSE 16. CISA has added this flaw to its Known Exploited Vulnerabilities Catalog and mandated that Federal Civilian Executive Branch agencies patch their systems by May 15, 2026.
Rapid Read Rapid Read
U.S. Government Alerts to Critical CopyFail Bug in Linux Systems

U.S. Government Alerts to Critical CopyFail Bug in Linux Systems

The U.S. government has issued a warning about a severe security vulnerability, known as the CopyFail bug, affecting major versions of the Linux operating system. The bug, tracked as CVE-2026-31431, allows attackers to gain full control of vulnerable systems and is being actively exploited in malicious campaigns. Although a patch was released shortly after the bug's discovery, many Linux distributions have yet to implement it, leaving systems at risk. The vulnerability affects widely used Linux versions, including Red Hat Enterprise Linux, Ubuntu, and Amazon Linux, among others.
Trendline Trendline
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
Rapid Read Rapid Read
CISA Warns of Exploitation of 'Copy Fail' Linux Vulnerability Affecting All Distributions Since 2017

CISA Warns of Exploitation of 'Copy Fail' Linux Vulnerability Affecting All Distributions Since 2017

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has issued a warning about the exploitation of a Linux kernel vulnerability known as 'Copy Fail', tracked as CVE-2026-31431. This security defect, which has been present in all Linux distributions since 2017, allows authenticated attackers with code execution privileges to modify the cache page of readable setuid-root binaries, leading to root shell access. The vulnerability was disclosed on April 29, and CISA has added it to its Known Exploited Vulnerabilities (KEV) catalog, urging federal agencies to patch it within two weeks. Microsoft has observed limited exploitation, primarily in proof-of-concept testing, but warns of its broad applicability and potential for significant impact, including full root privilege escalation and potential compromise of cloud and container environments.
Rapid Read Rapid Read
CISA Adds Exploited Linux Vulnerability CVE-2026-31431 to KEV Catalog

CISA Adds Exploited Linux Vulnerability CVE-2026-31431 to KEV Catalog

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical Linux vulnerability, CVE-2026-31431, to its Known Exploited Vulnerabilities (KEV) catalog. This local privilege escalation flaw, known as Copy Fail, affects various Linux distributions and allows unprivileged users to gain root access by exploiting a logic bug in the Linux kernel's authentication cryptographic template. The vulnerability, which has been present since 2017, poses a significant risk to cloud environments and containerized systems. Fixes have been released in recent Linux kernel updates, and federal agencies have been advised to apply these patches by May 15, 2026.
Trendline Trendline
Exploitation of 'Copy Fail' Linux Vulnerability Poses Security Risks

Exploitation of 'Copy Fail' Linux Vulnerability Poses Security Risks

Exploitation of 'Copy Fail' Linux Vulnerability Poses Security Risks
Rapid Read Rapid Read
Theori's AI-Discovered 'Copy Fail' Vulnerability Poses Security Risks to Linux Systems

Theori's AI-Discovered 'Copy Fail' Vulnerability Poses Security Risks to Linux Systems

Theori, a cybersecurity company, has identified a significant vulnerability in the Linux operating system, dubbed 'Copy Fail'. This flaw, tracked as CVE-2026-31431, was discovered using Theori's AI-powered penetration testing platform, Xint. The vulnerability affects all mainstream Linux kernels built since 2017, potentially allowing attackers with authenticated local access to gain root access to systems. Theori's disclosure, which included a proof-of-concept exploit, has been criticized for its lack of technical detail, as it relied heavily on AI-generated content. Despite this, the Cybersecurity and Infrastructure Security Agency has added the vulnerability to its catalog of known exploited vulnerabilities. Theori has stated that patches were issued by major Linux distributions before the public disclosure, but the vulnerability still poses a risk, especially if paired with another exploit to gain initial access.
Rapid Read Rapid Read
CISA Considers Shortening Deadlines for Fixing Cyber Vulnerabilities Amid AI Concerns

CISA Considers Shortening Deadlines for Fixing Cyber Vulnerabilities Amid AI Concerns

The Cybersecurity and Infrastructure Security Agency (CISA) is contemplating reducing the time allowed for fixing critical IT system vulnerabilities from weeks to just three days. This consideration arises from concerns that advanced AI models, such as Mythos and OpenAI's GPT-5.4-Cyber, could enable hackers to exploit vulnerabilities much faster than before. The potential change reflects the need for quicker responses to cyber threats, as AI tools can identify and exploit software flaws in a matter of hours. The proposal is being discussed by CISA's acting chief, Nick Andersen, and the U.S. national cyber director, Sean Cairncross.
Rapid Read Rapid Read
Over 40,000 Servers Compromised in cPanel Exploitation, Urgent Patching Required

Over 40,000 Servers Compromised in cPanel Exploitation, Urgent Patching Required

A critical vulnerability in cPanel & WebHost Manager (WHM), identified as CVE-2026-41940, has led to the compromise of over 40,000 servers. This security flaw allows unauthenticated attackers to gain administrative access, potentially taking over host systems and compromising configurations, databases, and websites. The vulnerability was disclosed on April 28, and exploitation has been ongoing since late February, with a significant increase in activity following public disclosure. The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added this vulnerability to its Known Exploited Vulnerabilities catalog, urging immediate patching.
Rapid Read Rapid Read
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.
Rapid Read Rapid Read
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.
Rapid Read Rapid Read
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.