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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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Redhat_linux | — | No solution exists | Aug 31, 2026 | Aug 26, 2026 |
| Ubuntu | — | Upgrade linux-image-6.8.0-1036-nvidia-tegraUpgrade linux-image-nvidia-tegraUpgrade linux-image-6.8.0-1036-nvidia-tegra-rtUpgrade linux-image-nvidia-tegra-rt-6.8Upgrade linux-image-nvidia-tegra-rtUpgrade linux-image-nvidia-tegra-6.8 | Oct 7, 2026 | Oct 6, 2026 |
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