CVE-2024-21853

What it actually does

Improper finite state machines in the hardware logic of affected 4th and 5th Generation Intel Xeon processors allow an authorized local user to trigger a denial of service condition.

Why it matters to the business

Organizations running affected SUSE Linux distributions on vulnerable Intel Xeon processors face potential unplanned system downtime and service interruptions, increasing operational costs and requiring urgent patching of multiple kernel packages across enterprise server fleets.

How an attack unfolds

An attacker with local access on a vulnerable system crafts inputs that exploit the flawed hardware state machines in the processor, leading to a denial of service without needing elevated privileges beyond standard user access.

How to fix it

Apply the vendor-supplied kernel updates for all affected SUSE packages, specifically upgrading to kernel-default 5.3.18-150200.24.148.1 (and equivalent fixed versions for kernel-default-base, kernel-source, and related packages) across SUSE Linux Enterprise Server, High Performance Computing, SAP Applications, Enterprise Storage, and Live Patching products.

How to confirm the fix worked

Verify installed kernel package versions match or exceed the fixed releases (for example, kernel-default at 5.3.18-150200.24.148.1), confirm processor generation via system tools, and test for stability under local workloads that previously triggered the issue.

Typical attack path

1. Gain local authenticated access to a system using affected Intel Xeon processors and SUSE kernels
2. Execute code or commands that interact with the processor's finite state machine logic
3. Trigger the hardware flaw to induce a denial of service condition such as a system hang or crash

How to detect it

Review system logs for unexpected kernel panics, hardware-related faults, or processor error messages on affected Intel Xeon hardware; correlate with local user activity timestamps and check for repeated denial of service events without external network indicators.

What your security team should do

• Prioritize patching all affected SUSE kernel packages within the next maintenance window due to the local attack vector
• Inventory systems running 4th and 5th Generation Intel Xeon processors on SUSE 15 SP2 variants
• Restrict local user access where possible until patches are deployed
• Monitor for post-patch stability and review EPSS trends for any increase in exploit likelihood