pedit COW Linux Kernel Flaw Enables Root Access via Memory P

Introduction

A public exploit for a Linux kernel flaw hit the streets less than 24 hours after the CVE was assigned — and teams that don’t test for local privilege escalation in the memory subsystem are now staring at a ticking clock on production servers.

The problem

On June 16, CVE-2026-46331 — nicknamed “pedit COW” — was assigned for an out-of-bounds write bug in the Linux kernel’s traffic-control subsystem, specifically in the packet-editing action (act_pedit). As reported by The Hacker News (thehackernews.com), a local unprivileged user can exploit this flaw to write outside the intended buffer, corrupting shared page-cache memory and ultimately achieving root privileges on an affected system. Red Hat has rated the flaw with a significant severity score, and a working, publicly available exploit appeared within a day of the CVE’s publication. No in-the-wild campaigns have been confirmed at the time of reporting, but the exploit code is now in the hands of anyone who wants it.

Consequences

The immediate practical risk is that any unprivileged user with a shell — either a malicious insider or an attacker who has already gained a foothold through another vector — can escalate to full root on a patched-but-not-yet-updated kernel. In shared hosting, SaaS multi-tenant environments, or containerized workloads where namespaces rely on the kernel’s security boundaries, this single bug breaks the isolation layer. Once an attacker achieves root, they can install persistent backdoors, exfiltrate secrets from kernel memory, and pivot laterally with full control of the host.

Linux Kernel’s “pedit COW” Flaw Cracks Open Root Access via Memory Poisoning — What the Industry Missed

Introduction

The problem

Consequences

Causes

Technical analysis

How to defend

How Drokio helps

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