CVE-2025-40035
Published Oct 28, 2025
Modified Apr 15, 2026
Description
In the Linux kernel, the following vulnerability has been resolved: Input: uinput - zero-initialize uinput_ff_upload_compat to avoid info leak Struct ff_effect_compat is embedded twice inside uinput_ff_upload_compat, contains internal padding. In particular, there is a hole after struct ff_replay to satisfy alignment requirements for the following union member. Without clearing the structure, copy_to_user() may leak stack data to userspace. Initialize ff_up_compat to zero before filling valid fields.
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References
Other References
https://git.kernel.org/stable/c/1b317796013f666ae5040edbf0f230ec61496d42
https://git.kernel.org/stable/c/48c96b7e9e03516936d6deba54b5553097eae817
https://git.kernel.org/stable/c/877172b97786ed1678640dff0b2d35abb328844c
https://git.kernel.org/stable/c/933b87c4590b42500299f00ff55f555903056803
https://git.kernel.org/stable/c/d3366a04770eea807f2826cbdb96934dd8c9bf79
https://git.kernel.org/stable/c/e63aade22a33e77b93c98c9f02db504d897a76b4
https://git.kernel.org/stable/c/f5e1f3b85aadce74268c46676772c3e9fa79897e
https://git.kernel.org/stable/c/fd8a23ecbc602d00e47b27f20b07350867d0ebe5
Frequently Asked Questions
What is CVE-2025-40035? +
In the Linux kernel, the following vulnerability has been resolved:
Input: uinput - zero-initialize uinput_ff_upload_compat to avoid info leak
Struct ff_effect_compat is embedded twice inside
uinput_ff_upload_compat, contains internal padding. In particular, there
is a hole after struct ff_replay to satisfy alignment requirements for
the following union member. Without clearing the structure,
copy_to_user() may leak stack data to userspace.
Initialize ff_up_compat to zero before filling valid fields.
How do I check if I'm vulnerable to CVE-2025-40035? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.