{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "61a2f1460fd03285ea34c1a235f2f50f71e13a1f"
            },
            {
              "fixed": "1dd99b8f4e143592e12e5a77e7b538bc698116cb"
            },
            {
              "fixed": "f1db80a67da928a92ba460ede1be52d8941f46be"
            },
            {
              "fixed": "399d806f998f7a25405fc1b97227e579aead24af"
            },
            {
              "fixed": "7ed120b1a007bace57c461805519d70e1af44e59"
            },
            {
              "fixed": "39d163627b51886492bf31f66cb02c94613d2287"
            },
            {
              "fixed": "f2365a63b02ddea32e7db78b742c2503ec7b81f1"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.19.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "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-2026-64472.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nvfio/mlx5: Fix racy bitfields and tighten struct layout\n\nBitfield operations are not atomic, they use a read-modify-write\npattern, therefore we should be careful not to pack bitfields that\ncan be concurrently updated into the same storage unit.\n\nThis split takes a binary approach: flags that are only modified\npre/post open/close remain bitfields, flags modified from user\naction, including actions that reach across to another device (ex.\nreset) use dedicated storage units.\n\nNote mlx5_vhca_page_tracker.status is relocated to fill the alignment\nhole this split exposes.\n\nBitfield justifications:\n\n  migrate_cap: written only in mlx5vf_cmd_set_migratable() at probe\n  chunk_mode: written only in mlx5vf_cmd_set_migratable() at probe\n  mig_state_cap: written only in mlx5vf_cmd_set_migratable() at probe\n\nDedicated storage units:\n\n  mdev_detach: written in the VF attach/detach event notifier\n               mlx5fv_vf_event() at runtime\n  log_active: written in mlx5vf_start_page_tracker()/\n              mlx5vf_stop_page_tracker() during runtime dirty tracking\n  deferred_reset: written in mlx5vf_state_mutex_unlock()/\n                  mlx5vf_pci_aer_reset_done() during runtime reset handling\n  is_err: set by tracker error handling and dirty-log polling at runtime\n  object_changed: set by tracker event handling and cleared by dirty-log\n                  polling at runtime",
  "id": "CVE-2026-64472",
  "modified": "2026-08-18T03:31:30.441053051Z",
  "published": "2026-07-25T08:51:35.978Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1dd99b8f4e143592e12e5a77e7b538bc698116cb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/399d806f998f7a25405fc1b97227e579aead24af"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/39d163627b51886492bf31f66cb02c94613d2287"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ed120b1a007bace57c461805519d70e1af44e59"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f1db80a67da928a92ba460ede1be52d8941f46be"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f2365a63b02ddea32e7db78b742c2503ec7b81f1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64472.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64472"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "vfio/mlx5: Fix racy bitfields and tighten struct layout"
}