CVE-2023-2269

What it actually does

A possible recursive locking scenario in table_clear within drivers/md/dm-ioctl.c leads to deadlock and denial of service in the Device Mapper multipathing sub-component.

Why it matters to the business

Systems relying on Linux kernel storage multipathing may experience unexpected unavailability, disrupting storage access and requiring manual intervention or reboot to recover.

How an attack unfolds

An attacker with local high-privileged access crafts inputs that trigger the recursive locking path in dm-ioctl, resulting in a deadlock that halts the affected subsystem.

How to fix it

Apply the latest available kernel updates that address the deadlock condition in dm-ioctl.c; monitor vendor advisories for backported fixes across supported distributions and embedded products.

How to confirm the fix worked

Verify the running kernel contains the upstream fix for the recursive locking issue; test device mapper multipath functionality under load to confirm absence of deadlock; review kernel changelogs for the relevant commit.

Typical attack path

1. Obtain local access with high privileges on an affected Linux system
2. Invoke the vulnerable IOCTL path against the device mapper interface
3. Trigger recursive locking leading to deadlock and service denial

How to detect it

Examine kernel logs for repeated deadlock or locking warnings referencing dm-ioctl or table_clear; correlate with high-privilege local sessions attempting storage configuration changes.

What your security team should do

• Prioritize kernel updates on all systems using device mapper multipathing
• Restrict local access to high-privilege accounts where possible
• Monitor kernel logs for deadlock indicators during routine operations