Input: zero ff_effect before compat copy in input_ff_effect_from_user

{
  "id": "242e6a6af4d94acd885fef3324d3429a82bf70f5178a9b5a7bece01b189cf02d",
  "url": "https://osv.dev/vulnerability/CVE-2026-98201",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2026-98201",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.271",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.222",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.189",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.158",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.112",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.54",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-98201",
      "aliases": [
        "CVE-2026-98201"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "2d56f3a32c0e62f99c043d2579840f9731fe5855"
                },
                {
                  "fixed": "ed0905fda39682d3da7937184397d3276abbffa8"
                },
                {
                  "fixed": "ec174c2ab1abb76b20fa167c6db848c3d97aa838"
                },
                {
                  "fixed": "6c26681c5668c973bd0e951407d670ac60d9cd66"
                },
                {
                  "fixed": "c5e573bb095d502be7cbbaa99c26a20984111c6d"
                },
                {
                  "fixed": "b878720e8bcaa4cf7163a5081f904dd6baf11b2c"
                },
                {
                  "fixed": "0d05b43b55d4784a42ce8fb318175f8ad7d9af5a"
                },
                {
                  "fixed": "ed0406e490f48ed180df140fe2a81be26bccb1a9"
                },
                {
                  "fixed": "f84819ef8d66931ee3998fee3c4f03230f4cb6cc"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98201.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "2.6.29"
                },
                {
                  "fixed": "5.10.271"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.222"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.189"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
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                  "fixed": "6.6.158"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.112"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.54"
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              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.8"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98201.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.176225897Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0d05b43b55d4784a42ce8fb318175f8ad7d9af5a",
        "https://git.kernel.org/stable/c/6c26681c5668c973bd0e951407d670ac60d9cd66",
        "https://git.kernel.org/stable/c/b878720e8bcaa4cf7163a5081f904dd6baf11b2c",
        "https://git.kernel.org/stable/c/c5e573bb095d502be7cbbaa99c26a20984111c6d",
        "https://git.kernel.org/stable/c/ec174c2ab1abb76b20fa167c6db848c3d97aa838",
        "https://git.kernel.org/stable/c/ed0406e490f48ed180df140fe2a81be26bccb1a9",
        "https://git.kernel.org/stable/c/ed0905fda39682d3da7937184397d3276abbffa8",
        "https://git.kernel.org/stable/c/f84819ef8d66931ee3998fee3c4f03230f4cb6cc",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98201.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-98201",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98201.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-98201",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 488384,
  "published_at": "2026-10-06T08:44:38.952+00:00"
}