CVE-2024-23307

What it actually does

Integer overflow in the Linux kernel raid5 module allows forced wraparound during stripe handling or parity calculations, resulting in incorrect memory access or allocation sizes that can crash the system.

Why it matters to the business

High-privileged users or local processes can trigger storage subsystem instability on Linux servers and appliances, causing unplanned downtime for RAID-protected data volumes and increasing operational recovery costs.

How an attack unfolds

An attacker with administrative access crafts specific I/O patterns or metadata that trigger the integer wrap in raid5 code paths; the resulting miscalculated buffer or stripe size leads to a kernel fault and denial of service.

How to fix it

Upgrade the Linux kernel to a version that contains the corrected raid5 arithmetic checks; if no fixed release is yet available, restrict untrusted local access to md/raid devices and monitor vendor advisories for backported patches.

How to confirm the fix worked

Confirm the running kernel version against the upstream commit that bounds the stripe or parity calculations; re-test RAID5 array creation and I/O workloads under load to verify absence of crashes.

Typical attack path

1. Obtain root or equivalent privileges on the target Linux system
2. Identify or create a RAID5 array managed by the md driver
3. Issue specially formed disk I/O or array configuration requests that exercise the vulnerable calculation
4. Trigger the integer wraparound to induce a kernel panic or hang

How to detect it

Review kernel logs for raid5-related oops or panic messages containing arithmetic errors or invalid stripe sizes; correlate with process activity that performed md or dm-raid configuration changes.

What your security team should do

• Prioritize kernel updates on all systems exposing RAID5 arrays
• Limit local administrative access to storage configuration interfaces until patched
• Include kernel version checks in regular vulnerability scanning