CVE-2023-53313

What it actually does

Improper input validation in the md/raid10 driver allows integer overflow when writing an unchecked large value to the md/max_read_errors sysfs interface.

Why it matters to the business

Potential storage subsystem misconfiguration on Linux systems using RAID10 arrays, leading to degraded error handling, possible data availability issues, and need for prompt kernel updates across affected deployments.

How an attack unfolds

An attacker with local access writes an oversized numeric value via echo to the max_read_errors sysfs entry; lack of bounds checking triggers overflow and incorrect max_corr_read_errors state.

How to fix it

Upgrade to a kernel containing commit 74050a3fdd4aecfd2cbf74d3c145812ab2744375 or apply the equivalent Debian package update (0.6.1.1-1 where applicable) that adds the missing input validation.

How to confirm the fix worked

Confirm the presence of input-range checks before the assignment in the raid10 driver source and verify the running kernel reports the fixed commit or package version.

Typical attack path

1. Obtain local shell or script execution on target host
2. Locate active md RAID10 devices via sysfs
3. Write unchecked large integer to /sys/block/md*/md/max_read_errors
4. Trigger overflow condition and observe altered error-correction behavior

How to detect it

Review audit logs or process execution history for writes to md/max_read_errors sysfs paths; correlate with any subsequent RAID10 error-handling anomalies or unexpected kernel behavior.

• /sys/block/md*/md/max_read_errors
• echo [0-9]{5,} > /sys/block/md

What your security team should do

• Prioritize patching systems with RAID10 configurations within normal change windows given low EPSS and non-KEV status
• Audit sysfs write permissions on md devices and restrict to privileged users only
• Monitor upstream stable kernel updates for backports of the validation fix