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CVE-2026-80786: fbdev: Wrap user-invoked calls to fb_set_var() in helper

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-04 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: Wrap user-invoked calls to fb_set_var() in helper Handle fbcon during display updates in fb_set_var_from_user(). Check with fbcon if the mode change is possible, update hardware state and finally update fbcon. Update all callers. Only the FBIOPUT_VSCREENINFO ioctl currently does all steps. Other mode-changes callers in sysfs and driver code are missing fbcon-related steps. With the new helper, ps3fb and sh_mobile_lcdcfb no longer maintain fbcon state themselves.

Affected products

• Linux: 2.6.12 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/07f7e46833f71472e30da54a50dacdf48521bdd3
• https://git.kernel.org/stable/c/3130e7bf43ecfe3a15bcf90b9698e0764a2d8d08
• https://git.kernel.org/stable/c/6f611e5e5f3327cf2e2daabe6ee5acac58cc784e
• https://git.kernel.org/stable/c/af39d039b5591e3ebaa2e013862bd8cacc6d9dc3
• https://git.kernel.org/stable/c/d33589eff3d40439b3c83e8da0d07d20df797d50
• https://git.kernel.org/stable/c/ed7e9715849abd0816b8487b0d12ebd05d6e938b

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