{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "c3021629a0d820247ee12b6c5192a1d5380e21c6"
            },
            {
              "fixed": "1f9156714592356b4fda57beac7eab9c2a462dd3"
            },
            {
              "fixed": "5630da218a45ba80f0aba0846cbe8aa655da122b"
            },
            {
              "fixed": "1ca605cfa59377f0143fb35b5b01360f37d1b7c4"
            },
            {
              "fixed": "0e4a5a000123d81234e27a2f8187688cf608f755"
            },
            {
              "fixed": "e6aa539720c3d8def69683ed0c07cf9faea4e8be"
            },
            {
              "fixed": "be353caffa8640f5e25fb3714ce8b0cef5e410e5"
            },
            {
              "fixed": "65a1c2551f7e16085acbb54aedde1feaa559ba7a"
            },
            {
              "fixed": "b5befa80fdbe287a98480effed9564712924add5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.35"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "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-2026-64266.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nfuse: re-lock request before returning from fuse_ref_folio()\n\nfuse_ref_folio() unlocks the request but does not re-lock it before\nreturning. fuse_chan_abort() can end the request and the async end\ncallback (eg fuse_writepage_free()) can free the args while the\nsubsequent copy chain logic after fuse_ref_folio() accesses them,\nleading to use-after-free issues.\n\nFix this by locking the request in fuse_ref_folio() before returning.",
  "id": "CVE-2026-64266",
  "modified": "2026-07-28T03:56:01.499816043Z",
  "published": "2026-07-25T08:49:15.142Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e4a5a000123d81234e27a2f8187688cf608f755"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1ca605cfa59377f0143fb35b5b01360f37d1b7c4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1f9156714592356b4fda57beac7eab9c2a462dd3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5630da218a45ba80f0aba0846cbe8aa655da122b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65a1c2551f7e16085acbb54aedde1feaa559ba7a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5befa80fdbe287a98480effed9564712924add5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/be353caffa8640f5e25fb3714ce8b0cef5e410e5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e6aa539720c3d8def69683ed0c07cf9faea4e8be"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64266.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64266"
    },
    {
      "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: re-lock request before returning from fuse_ref_folio()"
}