CVE-2024-21823

What it actually does

Hardware logic with insecure de-synchronization in Intel DSA and IAA on some 4th/5th generation Xeon processors allows a local authorized user to escalate privileges.

Why it matters to the business

Local attackers could gain elevated control on affected server hardware, risking unauthorized modification or disruption of workloads running on those processors.

How an attack unfolds

An attacker with existing local access on a vulnerable system supplies crafted inputs to the affected accelerators, triggering the de-synchronization to bypass privilege boundaries and obtain higher rights.

How to fix it

Apply the latest Intel microcode and BIOS/firmware updates that address the hardware logic flaw; restrict use of DSA and IAA where feasible until patched.

How to confirm the fix worked

Confirm updated microcode is loaded via processor version checks, review vendor security advisories for affected models, and retest with any available validation tools.

Typical attack path

1. Obtain local user access on the target system
2. Confirm presence of vulnerable Xeon processor and enabled DSA/IAA
3. Execute code that exercises the accelerators to trigger desynchronization
4. Escalate to higher privileges and perform unauthorized actions

How to detect it

Review system logs for unexpected privilege escalations or anomalous usage of DSA/IAA accelerators; correlate with local user activity around the time of suspected compromise.

What your security team should do

• Prioritize microcode and firmware updates on all systems using the affected Xeon generations
• Limit local access and use of hardware accelerators to least-privilege accounts
• Monitor privilege change events and accelerator usage for anomalies