CVE-2023-52870

What it actually does

Missing validation of the return value from mtk_alloc_clk_data() allows a NULL pointer dereference in the MediaTek MT6765 clock driver.

Why it matters to the business

Systems using affected kernel versions may experience unexpected crashes or instability during boot or clock initialization under low-memory conditions, leading to downtime on embedded and mobile devices.

How an attack unfolds

An attacker with local access or the ability to trigger low-memory conditions during early kernel initialization can cause the clock driver to dereference a NULL pointer returned by the allocation function, resulting in a kernel panic or potential memory corruption.

How to fix it

Apply the upstream fix commit 2617aa8ceaf30e41d3eb7f5fef3445542bef193a or upgrade to a Linux kernel version that includes this change in the clk-mt6765 driver.

How to confirm the fix worked

Verify the presence of the NULL return-value check after mtk_alloc_clk_data() calls in clk-mt6765.c and confirm the running kernel contains commit 2617aa8ceaf30e41d3eb7f5fef3445542bef193a or later equivalent.

Typical attack path

1. Trigger low-memory condition during kernel boot or driver probe on MT6765 hardware
2. mtk_alloc_clk_data() returns NULL due to allocation failure
3. Driver proceeds without checking the return value and dereferences the pointer
4. Kernel panics or enters unstable state

How to detect it

Review kernel logs for NULL pointer dereference oops in clk-mt6765 or mediatek clock code; inspect boot traces for allocation failures prior to driver initialization.

What your security team should do

• Prioritize kernel updates on all MT6765-based devices within standard patching windows
• Monitor for kernel oops or panic logs referencing clk-mt6765 during boot
• Test patched kernels in lab environments before broad deployment