CVE-2024-26974

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 resetdata 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 resetdata 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 adfdeviceresetworker+0x38/0xa0 [intelqat] Use-after-free read at 0x00000000bc56fddf (in kfence-#142): adfdeviceresetworker+0x38/0xa0 [intelqat] processonework+0x173/0x340

To resolve this race condition, the memory associated to the container of the workstruct 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 completiondone() function.