CVE-2026-98201Input: zero ff_effect before compat copy in input_ff_effect_from_user
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before ed0905fda39682d3da7937184397d3276abbffa8; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before ec174c2ab1abb76b20fa167c6db848c3d97aa838; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before 6c26681c5668c973bd0e951407d670ac60d9cd66; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before c5e573bb095d502be7cbbaa99c26a20984111c6d; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before b878720e8bcaa4cf7163a5081f904dd6baf11b2c; 2d56f3a32c0e62f99c043d2579840f9731fe5855 builds before 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before ed0406e490f48ed180df140fe2a81be26bccb1a9; from 2d56f3a32c0e62f99c043d2579840f9731fe5855 before f84819ef8d66931ee3998fee3c4f03230f4cb6cc | CNA record |
References
- https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8
- https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838
- https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66
- https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d
- https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c
- https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a
- https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9
- https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.