High-severity vulnerability in Linux caused by a single errant character
Summary
A serious security flaw was found in the Linux operating system caused by a single wrong character in its code. This flaw lets users without special rights gain full control over the system by exploiting a bug in a part of Linux that manages network rules called nf_tables.Key Facts
- The vulnerability is called CVE-2026-23111 and affects the nf_tables part of the Linux kernel.
- nf_tables helps manage firewall rules and replaced older tools like iptables.
- The bug was caused by an incorrect exclamation mark in the source code.
- This created a "use-after-free" vulnerability, meaning memory was used after it was freed, potentially allowing attackers to run harmful code.
- An attacker can use this flaw to gain root access, which means full control over the computer.
- The problem was fixed in the Linux kernel in February 2026.
- Security researchers have demonstrated how to exploit the flaw on Debian and Ubuntu Linux systems.
- This is one of several recent serious privilege escalation bugs found in Linux.
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