CVE-2023-33951

What it actually does

Race condition from improper locking during GEM object operations in the vmwgfx driver allows a local privileged user to read kernel memory contents.

Why it matters to the business

Privileged local attackers on affected Linux systems may leak sensitive kernel data that can be used to bypass protections or escalate attacks, increasing risk on servers and endpoints running the vulnerable driver.

How an attack unfolds

An attacker with local administrative access crafts concurrent operations on GEM objects to win the race, bypassing intended isolation and reading kernel memory that should remain inaccessible.

How to fix it

Upgrade the Linux kernel to a version containing the fix for improper locking in vmwgfx GEM handling; apply the latest packages from distribution vendors for Red Hat Enterprise Linux and related real-time variants as soon as available.

How to confirm the fix worked

Verify the running kernel version against vendor advisories, confirm the vmwgfx driver contains updated locking logic, and test that concurrent GEM operations no longer leak memory.

Typical attack path

1. Gain local privileged access on a target system
2. Load or trigger the vmwgfx driver with crafted GEM object operations
3. Exploit the race window created by missing locks
4. Read disclosed kernel memory contents for further exploitation

How to detect it

Review kernel logs for vmwgfx-related warnings or errors around GEM object handling; correlate with unexpected privileged process activity and memory access patterns on systems running the vulnerable driver.

What your security team should do

• Prioritize kernel updates on all affected systems despite low EPSS score
• Limit local privileged accounts and enforce least privilege
• Monitor upstream Linux kernel commits for vmwgfx race condition fixes
• Harden graphics driver usage where possible through configuration