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

CVE-2026-80786 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-80786, released September 5, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-80786
- Priority: High
- CVSS: 7.1 (Moderate)
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80786

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-80786](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80786.md) | Sep 5, 2026 |
| Linux | linux Debian 14 | 7.1.12-1 | [DEBIAN-CVE-2026-80786](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80786.md) | Sep 5, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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