CVE-2022-20148

What it actually does

Race condition leading to use-after-free in kernel code that grants local privilege escalation when an attacker already holds system execution privileges.

Why it matters to the business

Attackers who already possess high-level system access on affected devices or services could obtain further kernel-level control, increasing the chance of full system compromise and data exposure; the flaw affects the listed open-source component and has remained unpatched in many deployments for over four years.

How an attack unfolds

An attacker with existing system execution rights triggers the race window in the vulnerable kernel path, causes the use-after-free, and reclaims the freed object to overwrite kernel structures and elevate privileges.

How to fix it

Update onc-healthit/code-validator-api to commit fbd8ea121755a2d3d116b13f235bc8b61d8449af or later; rebuild and redeploy all dependent images or packages that embed the vulnerable code.

How to confirm the fix worked

Confirm the running binary or kernel module contains commit fbd8ea121755a2d3d116b13f235bc8b61d8449af; re-execute any available regression tests for the race condition and verify the vulnerable code path is no longer reachable.

Typical attack path

1. Obtain initial system-level execution on the target
2. Trigger concurrent operations that hit the race condition in the affected kernel routine
3. Reuse the freed memory object to corrupt kernel data structures
4. Execute payload to gain full kernel control

How to detect it

Review kernel or application logs for unusual object reuse patterns or crashes near the affected race window; examine process creation events that follow known system-level processes for unexpected privilege changes.

What your security team should do

• Immediately audit all builds for the vulnerable commit and schedule upgrade to fbd8ea121755a2d3d116b13f235bc8b61d8449af
• Harden systems to reduce the chance of initial system-level compromise that would be required to exploit this flaw
• Add the fixed commit hash to dependency-scanning policies so future builds reject the vulnerable version