{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5"
            },
            {
              "fixed": "dc11be133efca5fe3a2fb02b016dee825cc12f18"
            },
            {
              "fixed": "b8c9aa832b52680ee40d6cab0efb081f9a69df05"
            },
            {
              "fixed": "50f0012da1040f69a4e788cd9aed587c9a04983f"
            },
            {
              "fixed": "e705d81a7193dd19e69b8e2bad4696d78a4ea075"
            },
            {
              "fixed": "206c09b04dc5469c7ff14d8aceff2d47c88078d9"
            },
            {
              "fixed": "44f891bc088958399eec27f7604928694aa35581"
            },
            {
              "fixed": "2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.11.0"
            },
            {
              "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-2026-64600.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfs: resample the data fork mapping after cycling ILOCK\n\nxfs_reflink_fill_{cow_hole,delalloc} are both presented with an inode,\na data fork mapping, and a cow fork mapping.  Unfortunately, these two\nhelpers cycle the ILOCK to grab a transaction, which means that the\nmappings are stale as soon as we reacquire the ILOCK.  Currently we\nrefresh the cow fork mapping by re-calling xfs_find_trim_cow_extent, but\nwe don't refresh the data fork mapping beforehand, which means that the\nxfs_bmap_trim_cow in that function queries the refcount btree about the\nwrong physical blocks and returns an inaccurate value in *shared.\n\nIf *shared is now false, the directio write proceeds with a stale data\nfork mapping.  Fix this by querying the data fork mapping if the\nsequence counter changes across the ILOCK cycle.",
  "id": "CVE-2026-64600",
  "modified": "2026-07-27T03:56:36.295313654Z",
  "published": "2026-07-23T05:46:56.149Z",
  "references": [
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/22/14"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/22/18"
    },
    {
      "type": "WEB",
      "url": "http://www.openwall.com/lists/oss-security/2026/07/22/19"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/206c09b04dc5469c7ff14d8aceff2d47c88078d9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2f4acd0fcd862e22eab45690ec2c08c80b6ef2e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/44f891bc088958399eec27f7604928694aa35581"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/50f0012da1040f69a4e788cd9aed587c9a04983f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b8c9aa832b52680ee40d6cab0efb081f9a69df05"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dc11be133efca5fe3a2fb02b016dee825cc12f18"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e705d81a7193dd19e69b8e2bad4696d78a4ea075"
    },
    {
      "type": "ADVISORY",
      "url": "https://cdn2.qualys.com/advisory/2026/07/22/RefluXFS.txt"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64600.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64600"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "xfs: resample the data fork mapping after cycling ILOCK"
}