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7.8 — HIGH

CISA Warns of Linux Kernel 0-Day Vulnerability Exploited in Attacks

📅 4 May 2026 at 11:57 UTC📰 Cyber Security NewsView original source ↗
CISA Warns of Linux Kernel 0-Day Vulnerability Exploited in Attacks

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) has added a critical Linux kernel zero-day vulnerability to its Known Exploited Vulnerabilities (KEV) catalog, warning federal agencies and organizations worldwide to patch immediately or discontinue use of affected systems. Tracked as CVE-2026-31431 and dubbed “Copy Fail”, the flaw carries a CVSS score of 7.8 (High) and […] The post CISA Warns of Linux Kernel 0-Day Vulnerability Exploited in Attacks appeared first on Cyber Security News.

🤖 AI BriefingAuto-generated threat analysis
🔍Threat Overview

A critical Linux kernel zero-day vulnerability (CVE-2026-31431) has been exploited in attacks, posing a significant threat to federal agencies and organizations worldwide that use affected systems. The vulnerability allows for local exploitation with low attack complexity.

⚙️Technical Details
CVEs
CVE-2026-31431
Affected Systems
Amazon Amazon LinuxArista Cloudvision AgniArista Cloudvision PortalArista Netvisor OsArista Velocloud Edge
Attack Vectors
LOCAL
💥Impact Assessment
Severity: Critical
Who Is at Risk
Federal agencies and organizations worldwide that use affected systems
🛡️Recommended Actions
1Patch immediately with the latest available kernel update
2Discontinue use of affected systems until patched
3Monitor for suspicious activity and implement additional security controls
📦Affected Products
Amazon Amazon LinuxArista Cloudvision AgniArista Cloudvision PortalArista Netvisor OsArista Velocloud EdgeArista Velocloud GatewayCanonical Ubuntu LinuxDebian Debian LinuxLinux Linux KernelNixos Nixos
🔐NVD Verified DataVERIFIED
CVE-2026-31431 ↗CVSS 7.8 — HIGH
Attack Vector
LOCAL
Complexity
LOW
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weaknesses
CWE-669
Affected Products (CPE)
Amazon Amazon LinuxArista Cloudvision AgniArista Cloudvision PortalArista Netvisor OsArista Velocloud Edge

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