CVE-2026-98201 (GCVE-0-2026-98201)

Vulnerability from cvelistv5 – Published: 2026-10-06 08:44 – Updated: 2026-10-06 08:44
VLAI
Title
Input: zero ff_effect before compat copy in input_ff_effect_from_user
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < ed0905fda39682d3da7937184397d3276abbffa8 (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < ec174c2ab1abb76b20fa167c6db848c3d97aa838 (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < 6c26681c5668c973bd0e951407d670ac60d9cd66 (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < c5e573bb095d502be7cbbaa99c26a20984111c6d (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < b878720e8bcaa4cf7163a5081f904dd6baf11b2c (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < 0d05b43b55d4784a42ce8fb318175f8ad7d9af5a (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < ed0406e490f48ed180df140fe2a81be26bccb1a9 (git)
Affected: 2d56f3a32c0e62f99c043d2579840f9731fe5855 , < f84819ef8d66931ee3998fee3c4f03230f4cb6cc (git)
Create a notification for this product.
Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.54 , ≤ 6.18.* (semver)
Unaffected: 7.2.8 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc4 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: zero ff_effect before compat copy in input_ff_effect_from_user\n\nIn the compat path input_ff_effect_from_user() aliases the caller\u0027s\nnative struct ff_effect with the smaller struct ff_effect_compat and\ncopies only the compat sized prefix:\n\n\tcompat_effect = (struct ff_effect_compat *)effect;\n\n\tif (copy_from_user(compat_effect, buffer,\n\t\t\t   sizeof(struct ff_effect_compat)))\n\nThe tail of the native structure is never written. Callers pass an\nuninitialized on-stack object, for example evdev_do_ioctl() for\nEVIOCSFF, so those bytes keep their previous stack contents.\ninput_ff_upload() then stores the full native structure in\nff-\u003eeffects[id], from where a uinput based force feedback daemon can\nread it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to\nuserspace.\n\nZero the effect before the compat copy."
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    "datePublished": "2026-10-06T08:44:38.952Z",
    "dateReserved": "2026-09-25T10:25:14.324Z",
    "dateUpdated": "2026-10-06T08:44:38.952Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nInput: zero ff_effect before compat copy in input_ff_effect_from_user\n\nIn the compat path input_ff_effect_from_user() aliases the caller\u0027s\nnative struct ff_effect with the smaller struct ff_effect_compat and\ncopies only the compat sized prefix:\n\n\tcompat_effect = (struct ff_effect_compat *)effect;\n\n\tif (copy_from_user(compat_effect, buffer,\n\t\t\t   sizeof(struct ff_effect_compat)))\n\nThe tail of the native structure is never written. Callers pass an\nuninitialized on-stack object, for example evdev_do_ioctl() for\nEVIOCSFF, so those bytes keep their previous stack contents.\ninput_ff_upload() then stores the full native structure in\nff-\u003eeffects[id], from where a uinput based force feedback daemon can\nread it back via UI_BEGIN_FF_UPLOAD, disclosing kernel stack memory to\nuserspace.\n\nZero the effect before the compat copy."
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-09T11:04:32+00:00",
      "cve": "CVE-2026-98201",
      "id": "CVE-2026-98201",
      "initial_release_date": "2026-10-06T00:00:00+00:00",
      "product_status:known_affected": "277",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Input: zero ff_effect before compat copy in input_ff_effect_from_user",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98201.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "low",
      "current_release_date": "2026-10-08T16:50:45Z",
      "cve": "CVE-2026-98201",
      "id": "CVE-2026-98201",
      "initial_release_date": "2026-10-08T16:50:45Z",
      "product_status:known_affected": "269",
      "product_status:known_not_affected": "78",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-98201",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-98201.json",
      "version": "2"
    }
  }
}



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