Fragnesia Linux Vulnerability Let Attackers Gain Root Privileges

Cybersecuritynews •Guru Baran • May 13, 2026

A newly disclosed Linux kernel vulnerability dubbed Fragnesia allows any local unprivileged user to escalate privileges to root without requiring a race condition, making it one of the more reliable local privilege escalation exploits seen in recent years. Discovered by William Bowling of the V12 security team, Fragnesia joins a growing class of dangerous kernel […]

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Critical Linux Vulnerability 'Copy Fail' Grants Root Access Across Major Distros A newly disclosed vulnerability in the Linux kernel, tracked as CVE-2026-31431 and named 'Copy Fail', allows unprivileged local users to gain root access on virtually all major Linux distributions released since 2017. The exploit, which is a 732-byte Python script, modifies the page cache of any readable file without altering the on-disk version, making it stealthy and difficult to detect. Discovered by Theori researcher Taeyang Lee using AI-assisted tools, the flaw stems from a logic error in the kernel's cryptographic subsystem, specifically within the algif_aead module. Patches were made available on April 1, 2026, following the initial disclosure on March 23, 2026, with public proof-of-concept released on April 30, 2026. The vulnerability poses a significant risk, especially in multi-tenant environments like cloud services and Kubernetes, where it can enable container escapes. Security teams are urged to apply patches immediately to mitigate risks associated with this critical flaw. 159 sources 73

Extracted Entities

Fragnesia Linux Vulnerability Let Attackers Gain Root Privileges

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Extracted Entities

Attack Types (1)

MITRE ATT&CK (1)

Platforms (1)

Vulnerabilities (1)