CVE-2025-38126

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping

The stmmac platform drivers that do not open-code the clk_ptp_rate value

after having retrieved the default one from the device-tree can end up

with 0 in clk_ptp_rate (as clk_get_rate can return 0). It will

eventually propagate up to PTP initialization when bringing up the

interface, leading to a divide by 0:

Division by zero in kernel.

CPU: 1 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.12.30-00001-g48313bd5768a #22

Hardware name: STM32 (Device Tree Support)

Call trace:

unwind_backtrace from show_stack+0x18/0x1c

show_stack from dump_stack_lvl+0x6c/0x8c

dump_stack_lvl from Ldiv0_64+0x8/0x18

Ldiv0_64 from stmmac_init_tstamp_counter+0x190/0x1a4

stmmac_init_tstamp_counter from stmmac_hw_setup+0xc1c/0x111c

stmmac_hw_setup from __stmmac_open+0x18c/0x434

__stmmac_open from stmmac_open+0x3c/0xbc

stmmac_open from __dev_open+0xf4

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References