CVE-2022-48718

What it actually does

Null pointer dereference in mxsfb DRM driver when drm_atomic_get_new_bridge_state returns NULL instead of assuming a fixed format.

Why it matters to the business

Potential kernel crashes or instability on affected Linux systems with low exploit likelihood and no active ransomware use; limited downstream impact given prevalence data.

How an attack unfolds

Attacker triggers atomic modeset paths in the mxsfb driver where bridge state is absent, dereferencing NULL; referenced Android kernel RCE actors may adapt similar techniques for remote code execution attempts.

How to fix it

Apply kernel patches resolving the mxsfb NULL check; for listed Firefox packages on Ubuntu 20.04 update to 124.0+build1-0ubuntu0.20.04.1 or later equivalent fixed versions.

How to confirm the fix worked

Confirm updated kernel or package versions; test atomic modeset paths no longer dereference NULL by reviewing driver source or runtime bridge state handling.

Typical attack path

1. Identify systems running vulnerable Linux kernel with mxsfb DRM
2. Craft display or atomic update operations causing bridge state to be NULL
3. Trigger dereference leading to panic or potential memory corruption
4. Escalate via kernel context for code execution if conditions allow

How to detect it

Review kernel logs for mxsfb or drm_atomic related NULL dereference oops messages; correlate with any Android-targeted exploitation attempts noted by threat intelligence.

What your security team should do

• Prioritize patching systems with mxsfb graphics hardware within standard maintenance windows given low EPSS and no KEV status
• Monitor for any EPSS increases or new threat actor activity around Android kernel RCE patterns
• Validate fixed versions are deployed across all affected distributions