{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "26270bc189ea4b5a8356ec99561357fc87f00b32"
            },
            {
              "fixed": "f6682c23b6fac4780d297ae4662053d17e58fd52"
            },
            {
              "fixed": "466540e045d01fcacf383a5beb8a2dad2fc53a26"
            },
            {
              "fixed": "7b429d611060e87752e848851815537963726493"
            },
            {
              "fixed": "0039bdde36b23ccf1196635f1d52c5490481544d"
            },
            {
              "fixed": "0f0a83e26a9c7fd4b243c315ce07161d2496d83d"
            },
            {
              "fixed": "a257407e2bbbb099ed427719a50563f67fa366d8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.17.0"
            },
            {
              "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-2026-64409.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()\n\nEvery once in a while we see a hung btmtksdio_flush() task:\n\n INFO: task kworker/u17:0:189 blocked for more than 122 seconds.\n __cancel_work_timer+0x3f4/0x460\n cancel_work_sync+0x1c/0x2c\n btmtksdio_flush+0x2c/0x40\n hci_dev_open_sync+0x10c4/0x2190\n [..]\n\nIt all boils down to incorrect time_is_before_jiffies() usage in\nbtmtksdio_txrx_work().  The btmtksdio_txrx_work() loop is expected\nto be terminated if running for longer than 5*HZ.  However the\ntimeout check is twisted:  time_is_before_jiffies(old_jiffies + 5*HZ)\nevaluates to true when old_jiffies + 5*HZ is in the past i.e. when a\ntimeout has occurred.  Using OR with time_is_before_jiffies(txrx_timeout)\nmeans that:\n- before the 5-second timeout: the condition is `int_status || false`,\n  so it loops as long as there are pending interrupts.\n- after the 5-second timeout: the condition becomes `int_status || true`,\n  which is always true.\n\nWhen the loop becomes infinite btmtksdio_txrx_work() loop never\nterminates and never releases the SDIO host.\n\nFix loop termination condition to actually enforce a 5*HZ timeout.",
  "id": "CVE-2026-64409",
  "modified": "2026-08-18T03:31:00.557388468Z",
  "published": "2026-07-25T08:50:50.604Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0039bdde36b23ccf1196635f1d52c5490481544d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0f0a83e26a9c7fd4b243c315ce07161d2496d83d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/466540e045d01fcacf383a5beb8a2dad2fc53a26"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7b429d611060e87752e848851815537963726493"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a257407e2bbbb099ed427719a50563f67fa366d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f6682c23b6fac4780d297ae4662053d17e58fd52"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64409.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64409"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Bluetooth: btmtksdio: fix infinite loop in btmtksdio_txrx_work()"
}