CVE-2026-98201
Description
In the Linux kernel, the following vulnerability has been resolved: Input: zero ff_effect before compat copy in input_ff_effect_from_user In the compat path input_ff_effect_from_user() aliases the caller's native struct ff_effect with the smaller struct ff_effect_compat and copies only the compat sized prefix: compat_effect = (struct ff_effect_compat *)effect; if (copy_from_user(compat_effect, buffer, sizeof(struct ff_effect_compat))) The tail of the native structure is never written. Callers pass an uninitialized on-stack object, for example evdev_do_ioctl() for EVIOCSFF, so those bytes keep their previous stack contents. input_ff_upload() then stores the full native structure in ff->effects[id], from where a uinput based force feedback daemon can read it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to userspace. Zero the effect before the compat copy.
How to fix
- Linux Linuxed0905fda39682d3da7937184397d3276abbffa8, ec174c2ab1abb76b20fa167c6db848c3d97aa838, 6c26681c5668c973bd0e951407d670ac60d9cd66, c5e573bb095d502be7cbbaa99c26a20984111c6d, b878720e8bcaa4cf7163a5081f904dd6baf11b2c, 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a, ed0406e490f48ed180df140fe2a81be26bccb1a9, f84819ef8d66931ee3998fee3c4f03230f4cb6cc or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < ed0905fda39682d3da7937184397d3276abbffa8, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < ec174c2ab1abb76b20fa167c6db848c3d97aa838, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < 6c26681c5668c973bd0e951407d670ac60d9cd66, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < c5e573bb095d502be7cbbaa99c26a20984111c6d, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < b878720e8bcaa4cf7163a5081f904dd6baf11b2c, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < ed0406e490f48ed180df140fe2a81be26bccb1a9, 2d56f3a32c0e62f99c043d2579840f9731fe5855 ≤ v < f84819ef8d66931ee3998fee3c4f03230f4cb6cc, 2.6.29 | ed0905fda39682d3da7937184397d3276abbffa8, ec174c2ab1abb76b20fa167c6db848c3d97aa838, 6c26681c5668c973bd0e951407d670ac60d9cd66, c5e573bb095d502be7cbbaa99c26a20984111c6d, b878720e8bcaa4cf7163a5081f904dd6baf11b2c, 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a, ed0406e490f48ed180df140fe2a81be26bccb1a9, f84819ef8d66931ee3998fee3c4f03230f4cb6cc |
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