CVE-2026-98201

Kernel stack disclosure via partial compat effect copy

Published Oct 6, 2026 · Updated Oct 6, 2026

Information disclosure in Linux kernel input force-feedback handling allows local users to read kernel stack bytes via compat ioctls. The input_ff_effect_from_user() compat path copies only the smaller ff_effect_compat into an uninitialized native ff_effect, then input_ff_upload() retains the unwritten tail for retrieval through UI_BEGIN_FF_UPLOAD. Exposure requires a 32-bit compat force-feedback upload and access to a uinput force-feedback daemon path; the documented consequence is local kernel-memory disclosure, not remote access.

CVSS severityUnavailable
Unscored
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Linux kernel input force-feedback handling allows local users to read kernel stack bytes via compat ioctls. The input_ff_effect_from_user() compat path copies only the smaller ff_effect_compat into an uninitialized native ff_effect, then input_ff_upload() retains the unwritten tail for retrieval through UI_BEGIN_FF_UPLOAD. Exposure requires a 32-bit compat force-feedback upload and access to a uinput force-feedback daemon path; the documented consequence is local kernel-memory disclosure, not remote access.

The record

CVE
CVE-2026-98201
Published
Oct 6, 2026
Updated
Oct 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.29
  2. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <0d05b43b55d4784a42ce8fb318175f8ad7d9af5a
  3. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <6c26681c5668c973bd0e951407d670ac60d9cd66
  4. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <b878720e8bcaa4cf7163a5081f904dd6baf11b2c
  5. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <c5e573bb095d502be7cbbaa99c26a20984111c6d
  6. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ec174c2ab1abb76b20fa167c6db848c3d97aa838
  7. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ed0406e490f48ed180df140fe2a81be26bccb1a9
  8. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ed0905fda39682d3da7937184397d3276abbffa8
  9. Affected versionversion=2d56f3a32c0e62f99c043d2579840f9731fe5855 <f84819ef8d66931ee3998fee3c4f03230f4cb6cc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.29; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <0d05b43b55d4784a42ce8fb318175f8ad7d9af5a; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <6c26681c5668c973bd0e951407d670ac60d9cd66; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <b878720e8bcaa4cf7163a5081f904dd6baf11b2c; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <c5e573bb095d502be7cbbaa99c26a20984111c6d; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ec174c2ab1abb76b20fa167c6db848c3d97aa838; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ed0406e490f48ed180df140fe2a81be26bccb1a9; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <ed0905fda39682d3da7937184397d3276abbffa8; version=2d56f3a32c0e62f99c043d2579840f9731fe5855 <f84819ef8d66931ee3998fee3c4f03230f4cb6cc

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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