Description

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

clk: Fix clk_core_get NULL dereference

It is possible for clk_core_get to dereference a NULL in the following
sequence:

clk_core_get()
of_clk_get_hw_from_clkspec()
__of_clk_get_hw_from_provider()
__clk_get_hw()

__clk_get_hw() can return NULL which is dereferenced by clk_core_get() at
hw->core.

Prior to commit dde4eff47c82 ("clk: Look for parents with clkdev based
clk_lookups") the check IS_ERR_OR_NULL() was performed which would have
caught the NULL.

Reading the description of this function it talks about returning NULL but
that cannot be so at the moment.

Update the function to check for hw before dereferencing it and return NULL
if hw is NULL.

Classification

CVE ID: CVE-2024-27038

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.04% (probability of being exploited)

EPSS Percentile: 5.08% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/d7ae7d1265686b55832a445b1db8cdd69738ac07
https://git.kernel.org/stable/c/239174535dba11f7b83de0eaaa27909024f8c185
https://git.kernel.org/stable/c/0efb9ef6fb95384ba631d6819e66f10392aabfa2
https://git.kernel.org/stable/c/a8b2b26fdd011ebe36d68a9a321ca45801685959
https://git.kernel.org/stable/c/a5d9b1aa61b401867b9066d54086b3e4ee91f8ed
https://git.kernel.org/stable/c/c554badcae9c45b737a22d23454170c6020b90e6
https://git.kernel.org/stable/c/6f073b24a9e2becd25ac4505a9780a87e621bb51
https://git.kernel.org/stable/c/e97fe4901e0f59a0bfd524578fe3768f8ca42428

Timeline