CVE-2025-40346: Linux

EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: arch_topology: Fix incorrect error check in topology_parse_cpu_capacity() Fix incorrect use of PTR_ERR_OR_ZERO() in topology_parse_cpu_capacity() which causes the code to proceed with NULL clock pointers. The current logic uses !PTR_ERR_OR_ZERO(cpu_clk) which evaluates to true for both valid pointers and NULL, leading to potential NULL pointer dereference in clk_get_rate(). Per include/linux/err.h documentation, PTR_ERR_OR_ZERO(ptr) returns: "The error code within @ptr if it is an error pointer; 0 otherwise." This means PTR_ERR_OR_ZERO() returns 0 for both valid pointers AND NULL pointers. Therefore !PTR_ERR_OR_ZERO(cpu_clk) evaluates to true (proceed) when cpu_clk is either valid or NULL, causing clk_get_rate(NULL) to be called when of_clk_get() returns NULL. Replace with !IS_ERR_OR_NULL(cpu_clk) which only proceeds for valid pointers, preventing potential NULL pointer dereference in clk_get_rate().

Affected products

• Linux Linux: from 5.7, before 5.10.246 (fixed in 5.10.246); from 5.11, before 5.15.196 (fixed in 5.15.196); from 5.16, before 6.1.158 (fixed in 6.1.158); from 6.2, before 6.6.115 (fixed in 6.6.115); from 6.7, before 6.12.56 (fixed in 6.12.56); from 6.13, before 6.17.6 (fixed in 6.17.6)

Published 2025-12-16. Last modified 2026-06-17.