Vulnerability CVE-2024-26974
Published: 2024-05-01

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

crypto: qat - resolve race condition during AER recovery

During the PCI AER system's error recovery process, the kernel driver
may encounter a race condition with freeing the reset_data structure's
memory. If the device restart will take more than 10 seconds the function
scheduling that restart will exit due to a timeout, and the reset_data
structure will be freed. However, this data structure is used for
completion notification after the restart is completed, which leads
to a UAF bug.

This results in a KFENCE bug notice.

BUG: KFENCE: use-after-free read in adf_device_reset_worker+0x38/0xa0 [intel_qat]
Use-after-free read at 0x00000000bc56fddf (in kfence-#142):
adf_device_reset_worker+0x38/0xa0 [intel_qat]
process_one_work+0x173/0x340

To resolve this race condition, the memory associated to the container
of the work_struct is freed on the worker if the timeout expired,
otherwise on the function that schedules the worker.
The timeout detection can be done by checking if the caller is
still waiting for completion or not by using completion_done() function.

 References:
https://git.kernel.org/stable/c/daba62d9eeddcc5b1081be7d348ca836c83c59d7
https://git.kernel.org/stable/c/8e81cd58aee14a470891733181a47d123193ba81
https://git.kernel.org/stable/c/d03092550f526a79cf1ade7f0dfa74906f39eb71
https://git.kernel.org/stable/c/4ae5a97781ce7d6ecc9c7055396535815b64ca4f
https://git.kernel.org/stable/c/226fc408c5fcd23cc4186f05ea3a09a7a9aef2f7
https://git.kernel.org/stable/c/8a5a7611ccc7b1fba8d933a9f22a2e76859d94dc
https://git.kernel.org/stable/c/0c2cf5142bfb634c0ef0a1a69cdf37950747d0be
https://git.kernel.org/stable/c/bb279ead42263e9fb09480f02a4247b2c287d828
https://git.kernel.org/stable/c/7d42e097607c4d246d99225bf2b195b6167a210c
Copyright 2026, cxsecurity.com

 

Back to Top