CVE-2023-52624

What it actually does

DMCUB can remain idle during GPINT mailbox interactions, resulting in a system hang when the Linux kernel attempts hardware interface operations on AMD display hardware.

Why it matters to the business

Systems may experience unexpected freezes or require reboots, disrupting operations on affected Linux distributions with AMD graphics; low exploitability limits widespread urgency but still requires patching for stability.

How an attack unfolds

A local attacker triggers the GPINT command path while DMCUB is asleep, causing the kernel to hang without the wake-and-execute wrapper; no remote or unauthenticated vectors exist and no named threat actors are associated.

How to fix it

Update the Linux kernel to commit 2ef98c6d753a744e333b7e34b9cf687040fba57d or later; apply the corresponding fixed package versions such as java-11-openjdk 1:11.0.14.0.9-1.el8_1 where listed for affected distributions.

How to confirm the fix worked

Confirm kernel version includes the dc_wake_and_execute_gpint wrapper and test GPINT command sequences to verify DMCUB is properly woken before execution and returned to sleep afterward.

Typical attack path

1. Obtain local user access on a vulnerable Linux kernel with AMD display
2. Invoke code paths that issue GPINT commands to the DMCUB mailbox without prior wake
3. Trigger the idle state condition leading to system hang

How to detect it

Examine kernel logs for DMCUB-related hangs during GPINT operations and review dmesg or journalctl output for display driver failures around the time of system unresponsiveness.

What your security team should do

• Prioritize kernel updates on all AMD display systems within standard maintenance windows
• Monitor for any stability issues related to display hardware after patching
• Review EPSS trend and absence from KEV to maintain normal patching cadence