{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c090c8abae4b6b77a1bee116aa6c385456ebef96"
            },
            {
              "fixed": "e1711479e9068ea31b31353a702a51e639c3d059"
            },
            {
              "fixed": "a635f427d57e2012102ae4886b48d8955c59fb86"
            },
            {
              "fixed": "1efd3d474fc0ba74dfd984249bca78807d739812"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64259.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: make a fuse_req on SQE commit only findable after memcpy\n\nBad userspace might try to trick us and send commit SQEs request\nunique / commit-id of requests that are not even send to\nfuse-server (io_uring_cmd_done() not called) yet.\n\nfuse_uring_commit_fetch() ends the fuse request when the ring entry\nhas a wrong state, but that could have caused a use-after-free\nwith the memcpy operations in fuse_uring_send_in_task().\nIn order to avoid such races the call of fuse_uring_add_to_pq()\nis moved after the copy operations and just before completing\nthe io-uring request - malicious userspace cannot find the request\nanymore until all prepration work in fuse-client/kernel is completed.\n\nThis also moves fuse_uring_add_to_pq() a bit up in the code to\navoid a forward declaration. Also not with a preparation commit,\nto make it easier to back port to older kernels.",
  "id": "CVE-2026-64259",
  "modified": "2026-07-28T03:56:08.063839464Z",
  "published": "2026-07-25T08:49:10.756Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1efd3d474fc0ba74dfd984249bca78807d739812"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a635f427d57e2012102ae4886b48d8955c59fb86"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1711479e9068ea31b31353a702a51e639c3d059"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64259.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64259"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "fuse-uring: make a fuse_req on SQE commit only findable after memcpy"
}