Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: fbdev: clear fb_info->mode before deleting a videomode fb_set_var() can delete a mode from info->modelist when userspace passes FB_ACTIVATE_INV_MODE through FBIOPUT_VSCREENINFO. The code checks that the mode being deleted is not the current info->var and that fbcon is not using it, but it does not check fb_info->mode. fb_info->mode may still point into the modelist entry being deleted. If the entry is freed, later mode sysfs reads through show_mode() can dereference a stale pointer. Clear fb_info->mode before calling fb_delete_videomode() when it matches the mode being removed.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before ce7fef961c63229b22dec415fb988899f479d61f; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 95e647d2a5304a8fd11f1ba3c8502de700650131 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 7.1.10 through 7.1.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/ce7fef961c63229b22dec415fb988899f479d61f
- https://git.kernel.org/stable/c/95e647d2a5304a8fd11f1ba3c8502de700650131
ADP enrichment
No English description supplied.
No references supplied.