CVE-2023-52472

What it actually does

Missing allocation check on mpi_alloc() in RSA crypto code allows potential NULL pointer dereference leading to kernel crash.

Why it matters to the business

Local denial of service on Linux systems performing RSA operations could interrupt services or require reboots; widespread kernel deployment increases exposure across servers and devices despite low exploitability.

How an attack unfolds

An attacker with local access triggers RSA crypto operations that invoke mpi_alloc(); if allocation fails the unchecked NULL is dereferenced causing a crash. No public exploits or active threat actors have been observed exploiting this path.

How to fix it

Update Linux kernel to commit 2831f4d3bfa68e64c5f83e96688be779c87b3511 or later stable release containing the allocation failure check in the RSA module.

How to confirm the fix worked

Confirm kernel source contains the mpi_alloc NULL check after the referenced commit; run static analysis tools on crypto/rsa.c and verify no crash on allocation paths during RSA operations.

Typical attack path

1. Obtain local user or process execution on target Linux system
2. Trigger RSA key operations that reach mpi_alloc() in crypto subsystem
3. Force allocation failure scenario (theoretical) to dereference NULL pointer
4. Kernel panics resulting in denial of service

How to detect it

Review kernel logs for NULL pointer dereference oops in crypto/rsa paths; inspect process activity performing RSA operations around crash timestamps.

What your security team should do

• Apply kernel update containing commit 2831f4d3bfa68e64c5f83e96688be779c87b3511 across all affected distributions
• Monitor for local privilege escalation attempts that could chain into this path
• Prioritize patching on systems handling cryptographic workloads