CVE-2026-98201 (GCVE-0-2026-98201)
Vulnerability from cvelistv5
Published
2026-10-06 08:44
Modified
2026-10-19 09:15
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
Version: 2d56f3a32c0e62f99c043d2579840f9731fe5855
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{
  "containers": {
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          "programFiles": [
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      "cpeApplicability": [
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:15:32.269Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8"
        },
        {
          "url": "https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838"
        },
        {
          "url": "https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d"
        },
        {
          "url": "https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a"
        },
        {
          "url": "https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9"
        },
        {
          "url": "https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc"
        }
      ],
      "title": "Input: zero ff_effect before compat copy in input_ff_effect_from_user",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98201",
    "datePublished": "2026-10-06T08:44:38.952Z",
    "dateReserved": "2026-09-25T10:25:14.324Z",
    "dateUpdated": "2026-10-19T09:15:32.269Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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