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CVE PROGRAM SOURCE RECORD7.8 High

CVE-2026-80579

fbdev: clear fb_info->mode before deleting a videomode

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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 products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < ce7fef961c63229b22dec415fb988899f479d61faffected
  • 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to < 95e647d2a5304a8fd11f1ba3c8502de700650131affected

Linux Linux

Default version status: affected

  • 2.6.12affected
  • 0 to < 2.6.12unaffected
  • 7.1.10 to ≤ 7.1.*unaffected
  • 7.2 to ≤ *unaffected

References