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Input: zero ff_effect before compat copy in input_ff_effect_from_user

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-98201

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-98201

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "ed0905fda39682d3da7937184397d3276abbffa8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "ec174c2ab1abb76b20fa167c6db848c3d97aa838",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "6c26681c5668c973bd0e951407d670ac60d9cd66",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "c5e573bb095d502be7cbbaa99c26a20984111c6d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "b878720e8bcaa4cf7163a5081f904dd6baf11b2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "0d05b43b55d4784a42ce8fb318175f8ad7d9af5a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "ed0406e490f48ed180df140fe2a81be26bccb1a9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2d56f3a32c0e62f99c043d2579840f9731fe5855",
        "lessThan": "f84819ef8d66931ee3998fee3c4f03230f4cb6cc",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/input/input-compat.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.271",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.222",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.189",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.158",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.112",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.54",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/input/input-compat.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-98201

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#38281 · Revision 1
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Publisher date
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