CVE-2025-38584 Information

Aug 20, 2025 cve

Description

In the Linux kernel the following vulnerability has been resolved:

padata: Fix pd UAF once and for all

There is a race condition/UAF in padata_reorder that goes back to the initial commit. A reference count is taken at the start of the process in padata_do_parallel and released at the end in padata_serial_worker.

This reference count is (and only is) required for padata_replace to function correctly. If padata_replace is never called then there is no issue.

In the function padata_reorder which serves as the core of padata as soon as padata is added to queue->serial.list and the associated spin lock released that padata may be processed and the reference count on pd would go away.

Fix this by getting the next padata before the squeue->serial lock is released.

In order to make this possible simplify padata_reorder by only calling it once the next padata arrives.

Reference

https://git.kernel.org/stable/c/71203f68c7749609d7fc8ae6ad054bdedeb24f91 https://git.kernel.org/stable/c/cdf79bd2e1ecb3cc75631c73d8f4149be6019a52 https://git.kernel.org/stable/c/dbe3e911a59bda6de96e7cae387ff882c2c177fa

CNNVD-202508-2153 (Published: 2025-08-19)

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