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CVE-2026-98201

Input: zero ff_effect before compat copy in input_ff_effect_from_user

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in ed0905fda39682d3da7937184397d3276abbffa8; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in ec174c2ab1abb76b20fa167c6db848c3d97aa838; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in 6c26681c5668c973bd0e951407d670ac60d9cd66; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in c5e573bb095d502be7cbbaa99c26a20984111c6d; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in b878720e8bcaa4cf7163a5081f904dd6baf11b2c; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in ed0406e490f48ed180df140fe2a81be26bccb1a9; From 2d56f3a32c0e62f99c043d2579840f9731fe5855 · fixed in f84819ef8d66931ee3998fee3c4f03230f4cb6cc

  • Linux Linux

    2.6.29

  • KernelLinux

    From 2.6.29 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.54; From 6.19.0 · fixed in 7.2.8

References 8

git.kernel.org