Amazon Linux 2023: CVE-2023-52439: Important priority package update for kernel

In the Linux kernel, the following vulnerability has been resolved:
uio: Fix use-after-free in uio_open
core-1core-2
-------------------------------------------------------
uio_unregister_deviceuio_open
idev = idr_find()
device_unregister(&idev->dev)
put_device(&idev->dev)
uio_device_release
get_device(&idev->dev)
kfree(idev)
uio_free_minor(minor)
uio_release
put_device(&idev->dev)
kfree(idev)
-------------------------------------------------------
In the core-1 uio_unregister_device(), the device_unregister will kfree
idev when the idev->dev kobject ref is 1. But after core-1
device_unregister, put_device and before doing kfree, the core-2 may
get_device. Then:
1. After core-1 kfree idev, the core-2 will do use-after-free for idev.
2. When core-2 do uio_release and put_device, the idev will be double
freed.
To address this issue, we can get idev atomic & inc idev reference with
minor_lock.
A flaw was found in the Linux kernel’s uio subsystem. A use-after-free memory flaw in the uio_open functionality allows a local user to crash or escalate their privileges on the system.