CVE-2023-52819

What it actually does

Array-index-out-of-bounds access in pptable structs for Polaris and Tonga GPUs caused by non-flexible array declarations in AMD display code.

Why it matters to the business

Kernel instability or crashes on systems using affected AMD GPUs, increasing downtime and maintenance costs; low exploitability reduces immediate risk but patch urgency remains for stability.

How an attack unfolds

An attacker with local access triggers graphics operations that populate pptable structures, causing UBSAN-detected out-of-bounds reads or writes in the kernel driver; no public exploits or ransomware use observed despite listed threat actor references.

How to fix it

Update garden-io/garden to commit 3117964da40d3114f129a6131b4ada89eaa4eb8c or later; apply equivalent upstream Linux kernel patches that convert pptable structs to flexible arrays.

How to confirm the fix worked

Verify the commit 3117964da40d3114f129a6131b4ada89eaa4eb8c is present in the repository; recompile and test with UBSAN enabled on Polaris/Tonga hardware to confirm absence of array-index-out-of-bounds reports.

Typical attack path

1. Obtain local access to a system with Polaris or Tonga AMD GPU
2. Trigger code paths that initialize or access pptable flexible-array structs
3. Cause out-of-bounds array indexing leading to UBSAN violation or memory corruption
4. Escalate to kernel crash or potential code execution if further weaknesses exist

How to detect it

Review kernel logs for UBSAN array-index-out-of-bounds reports involving amd or pptable; inspect git history for absence of the referenced commit in garden-io/garden codebases.

What your security team should do

• Apply the listed commit immediately on all garden-io/garden deployments
• Monitor kernel logs for UBSAN warnings on AMD GPU systems
• Prioritize patching any remaining unpatched Linux instances using affected AMD GPUs