Description

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().

Classification

CVE ID: CVE-2023-52731

Affected Products

Vendor: Linux

Product: Linux

Exploit Prediction Scoring System (EPSS)

EPSS Score: 0.05% (probability of being exploited)

EPSS Percentile: 17.83% (scored less or equal to compared to others)

EPSS Date: 2025-02-04 (when was this score calculated)

References

https://git.kernel.org/stable/c/87b9802ca824fcee7915e717e9a60471af62e8e9
https://git.kernel.org/stable/c/f1d91f0e9d5a240a809698d7d9c5a538e7dcc149
https://git.kernel.org/stable/c/3efc61d95259956db25347e2a9562c3e54546e20

Timeline