{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c2c9af9a0b13261c36909036057a116f2edb5e1a"
            },
            {
              "fixed": "b156bb9966972122b148acab8bdf415cdb8176a3"
            },
            {
              "fixed": "d01a09b442cb786cd44ccc7c84d57e2856d6737c"
            },
            {
              "fixed": "46725a0056c884cf58a6897f222892807327d82d"
            }
          ],
          "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-2026-64588.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse-uring: fix data races on ring-\u003eready\n\nOn weakly-ordered architectures, the store to fiq-\u003eops can be\nreordered past the store to ring-\u003eready, allowing a CPU that sees\nring-\u003eready == true via fuse_uring_ready() to dispatch requests\nthrough a stale fiq-\u003eops pointer. Upgrade the store to\nsmp_store_release() and the load in fuse_uring_ready() to\nsmp_load_acquire() so that the preceding WRITE_ONCE(fiq-\u003eops, ...)\nis visible to any CPU that observes ring-\u003eready == true.\n\nAdditionally, fuse_uring_do_register() publishes ring-\u003eready with\nWRITE_ONCE() but the fast-path check reads it with a plain load.\nThis is a marked-vs-unmarked access that KCSAN will flag. Wrap it in\nREAD_ONCE() to mark it without adding unnecessary ordering.\n\nAlso wrap the fc-\u003ering load in fuse_uring_ready() in READ_ONCE() to\nprevent the compiler from reloading it between the NULL check and the\ndereference.",
  "id": "CVE-2026-64588",
  "modified": "2026-08-09T03:30:27.757407130Z",
  "published": "2026-08-06T07:13:46.688Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/46725a0056c884cf58a6897f222892807327d82d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b156bb9966972122b148acab8bdf415cdb8176a3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d01a09b442cb786cd44ccc7c84d57e2856d6737c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64588.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64588"
    },
    {
      "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: fix data races on ring-\u003eready"
}