CVE-2024-53193

What it actually does

The vulnerability causes memory corruption by writing data into a flexible array member that is not positioned at the end of its containing structure, overwriting an adjacent spinlock variable in the kernel clock provider.

Why it matters to the business

This can lead to kernel instability, crashes, or unpredictable behavior on Loongson2-based systems, potentially disrupting operations and requiring reboots or patches. No widespread ecosystem dependents noted.

How an attack unfolds

An attacker with the ability to load or trigger the clk-loongson2 driver probe could cause the allocation to misplace the flexible array, leading to corruption of the clk_lock spinlock during initialization. Threat actors in 2024 zero-day campaigns and Linux kernel out-of-bounds write scenarios have been associated with similar kernel issues.

How to fix it

Update to fixed kernel versions that move the clk_data member to the end of the struct loongson2_clk_provider and add a preventive code comment. For affected flashplugin-nonfree on Ubuntu 14.04 LTS update to version 11.2.202.626ubuntu0.14.04.1.

How to confirm the fix worked

Verify the struct definition has clk_data as the last member and check for absence of -Wflex-array-member-not-at-end warning during compilation.

Typical attack path

1. Identify system using Loongson2 clk driver
2. Trigger driver probe or module load
3. Observe or exploit resulting memory corruption

How to detect it

Look for kernel oops or panic logs related to clk-loongson2 or memory corruption in clock initialization; review probe function allocations in drivers/clk/clk-loongson2.c.

What your security team should do

• Apply kernel updates immediately given publication date and EPSS stability
• Audit driver initialization code for similar flexible array placement issues
• Monitor kernel logs for related memory corruption events