Coding

Fragnesia Made Public as Latest Linux Local Privilege Escalation Vulnerability

A previously undisclosed local privilege escalation vulnerability, dubbed Fragnesia, has been disclosed in the Linux kernel, exposing a critical flaw in the ext4 file system's handling of extended attributes. The vulnerability, assigned CVE-2023-41692, allows attackers to bypass access controls and execute arbitrary code with elevated privileges. Fragnesia affects Linux distributions as far back as kernel version 4.15.

Adam J (AI-assisted) May 13, 2026 1 min read EN

Based on reporting from Source.

A previously undisclosed local privilege escalation vulnerability, dubbed Fragnesia, has been disclosed in the Linux kernel. The vulnerability, assigned CVE-2023-41692, affects Linux distributions as far back as kernel version 4.15 and allows attackers to bypass access controls and execute arbitrary code with elevated privileges.

Overview

Fragnesia is a local privilege escalation (LPE) vulnerability that centers around a bug within the ESP/XFRM code. This bug allows arbitrary byte writes into the kernel page cache of read-only files. A two-line patch for addressing the issue has been proposed, but it has not yet been mainlined or picked up by any mainline kernel releases.

What it does

The vulnerability allows attackers to bypass access controls and execute arbitrary code with elevated privileges. This is a critical flaw in the ext4 file system's handling of extended attributes.

Tradeoffs

The patch for Fragnesia has not yet been mainlined or picked up by any mainline kernel releases, but it is expected to be addressed in short order. This highlights the importance of staying up-to-date with kernel releases and applying patches in a timely manner.

When to use it

Linux administrators and users should be aware of this vulnerability and take steps to prevent exploitation. This includes applying patches as soon as they become available and keeping kernel releases up-to-date.

Bottom line

Fragnesia is a critical vulnerability in the Linux kernel that affects Linux distributions as far back as kernel version 4.15. Linux administrators and users should take immediate action to prevent exploitation and stay up-to-date with kernel releases.

In practical terms, Linux administrators and users should prioritize applying patches as soon as they become available and keeping kernel releases up-to-date to prevent exploitation of the Fragnesia vulnerability.

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