CVE-2022-50221

In the Linux kernel, the following vulnerability has been resolved: drm/fb-helper: Fix out-of-bounds access Clip memory range to screen-buffer size to avoid out-of-bounds access in fbdev deferred I/O's damage handling. Fbdev's deferred I/O can only track pages. From the range of pages, the damage handler computes the clipping rectangle for the display update. If the fbdev screen buffer ends near the beginning of a page, that page could contain more scanlines. The damage handler would then track these non-existing scanlines as dirty and provoke an out-of-bounds access during the screen update. Hence, clip the maximum memory range to the size of the screen buffer. While at it, rename the variables min/max to min_off/max_off in drm_fb_helper_deferred_io(). This avoids confusion with the macros of the same name.

The following products are affected by CVE-2022-50221 vulnerability.

Here, you will find a curated list of external links that provide in-depth information to CVE-2022-50221.

URL	Resource
https://git.kernel.org/stable/c/9c49ac792c639dbec0728b513329a32461f72253
https://git.kernel.org/stable/c/ae25885bdf59fde40726863c57fd20e4a0642183
https://lore.kernel.org/linux-cve-announce/2025061847-CVE-2022-50221-1b80@gregkh/T
https://nvd.nist.gov/vuln/detail/CVE-2022-50221
https://www.cve.org/CVERecord?id=CVE-2022-50221