CVE-2022-1652

What it actually does

A concurrency use-after-free vulnerability in the bad_flp_intr function of the Linux kernel allows a local process to trigger memory corruption, enabling arbitrary code execution or denial of service.

Why it matters to the business

Local attackers can seize full control of Linux-based systems or disrupt operations, risking data exposure, service outages, and compromise of servers or network appliances across enterprise and embedded environments.

How an attack unfolds

An attacker with local execution rights runs a crafted program that races the floppy interrupt handler to free memory while it is still referenced, then reuses the dangling pointer to inject and execute attacker-controlled code.

How to fix it

Apply the latest stable Linux kernel containing the fix for the bad_flp_intr use-after-free; update all affected distributions and vendor firmware to the patched releases provided by Red Hat, Debian, and NetApp.

How to confirm the fix worked

Confirm the running kernel version is newer than the vulnerable releases, review kernel commit history for the bad_flp_intr fix, and perform regression testing under concurrent floppy interrupt workloads.

Typical attack path

1. Gain local shell or process execution on a vulnerable Linux system
2. Prepare or deploy a program that triggers the bad_flp_intr race condition
3. Execute the program to corrupt kernel memory
4. Escalate to arbitrary code execution or trigger a kernel panic

How to detect it

Review kernel logs and dmesg output for crashes or warnings involving the floppy driver, inspect process execution history for unexpected local binaries, and correlate with user activity around the time of any anomalies.

What your security team should do

• Patch Linux kernels on all affected hosts and appliances immediately
• Limit local user privileges and remove unnecessary accounts
• Harden systems against local privilege-escalation paths
• Monitor kernel logs for anomalous interrupt or memory-related errors