Out-of-Bounds Affecting kernel-rt-debug package, versions *

Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug package and not the kernel-rt-debug package as distributed by Centos. See How to fix? for Centos:7 relevant fixed versions and status.

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

fbdev: Fix invalid page access after closing deferred I/O devices

When a fbdev with deferred I/O is once opened and closed, the dirty pages still remain queued in the pageref list, and eventually later those may be processed in the delayed work. This may lead to a corruption of pages, hitting an Oops.

This patch makes sure to cancel the delayed work and clean up the pageref list at closing the device for addressing the bug. A part of the cleanup code is factored out as a new helper function that is called from the common fb_release().

• https://access.redhat.com/security/cve/CVE-2023-52731
• https://git.kernel.org/stable/c/3efc61d95259956db25347e2a9562c3e54546e20
• https://git.kernel.org/stable/c/87b9802ca824fcee7915e717e9a60471af62e8e9
• https://git.kernel.org/stable/c/f1d91f0e9d5a240a809698d7d9c5a538e7dcc149