Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 67b723f5b74254d27962b1b59bddfee1584575ff before 9c49ac792c639dbec0728b513329a32461f72253; affected 67b723f5b74254d27962b1b59bddfee1584575ff before ae25885bdf59fde40726863c57fd20e4a0642183 |
| Linux / Linux | affected 5.18; unaffected 0 before 5.18; unaffected 5.19.2 through 5.19.*; unaffected 6.0 through * |
CWE
No CWE identifiers supplied.