io_uring/futex: ensure io_futex_wait() cleans up properly on failure

{
  "id": "9a75fc72ee0ad0d4bafc6315aae5f1e5516b61230fe75f51ab8b41550271bf1d",
  "url": "https://osv.dev/vulnerability/CVE-2025-39698",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "io_uring/futex: ensure io_futex_wait() cleans up properly on failure",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: io_uring/futex: ensure io_futex_wait() cleans up properly on failure The io_futex_data is allocated upfront and assigned to the io_kiocb async_data field, but the request isn't marked with REQ_F_ASYNC_DATA at that point. Those two should always go together, as the flag tells io_uring whether the field is valid or not. Additionally, on failure cleanup, the futex handler frees the data but does not clear ->async_data. Clear the data and the flag in the error path as well. Thanks to Trend Micro Zero Day Initiative and particularly ReDress for reporting this.",
    "evidence": "osv:CVE-2025-39698",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.44",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-39698",
      "aliases": [
        "CVE-2025-39698"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "194bb58c6090e39bd7d9b9c888a079213628e1f6"
                },
                {
                  "fixed": "d9f93172820a53ab42c4b0e5e65291f4f9d00ad2"
                },
                {
                  "fixed": "d34c04152df517c59979b4bf2a47f491e06d3256"
                },
                {
                  "fixed": "508c1314b342b78591f51c4b5dadee31a88335df"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39698.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.44"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39698.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:46.220391756Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/508c1314b342b78591f51c4b5dadee31a88335df",
        "https://git.kernel.org/stable/c/d34c04152df517c59979b4bf2a47f491e06d3256",
        "https://git.kernel.org/stable/c/d9f93172820a53ab42c4b0e5e65291f4f9d00ad2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39698.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39698",
        "https://www.zerodayinitiative.com/advisories/ZDI-25-915/",
        "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/2025/39xxx/CVE-2025-39698.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39698",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 514395,
  "published_at": "2025-09-05T17:21:04.36+00:00"
}