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

• 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: 2026-08-15 · updated 2026-08-17

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.

Affected products

• Linux kernel: 2.6.39 — fixed in 7.2

How to fix

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

References

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

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