{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "241f51931c35085449502c10f64fb3ecd6e02171"
            },
            {
              "fixed": "9798f7d41d85ff763afd1f1cc0533b5c416c8348"
            },
            {
              "fixed": "ab84fd7779a2a7ff5d2c8eac212c43733f56216e"
            },
            {
              "fixed": "859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020"
            },
            {
              "fixed": "9ca7053d6215d89c33f28893bfd1625a32919d3f"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "c524f9561c657b8af26dd4f67092b8928261aa62"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "6.1.9"
            },
            {
              "fixed": "6.2"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.94"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.36"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63871.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls\n\niso_connect_bis(), iso_connect_cis(), iso_listen_bis(), and\niso_conn_big_sync() call hci_get_route() using iso_pi(sk)-\u003edst,\niso_pi(sk)-\u003esrc, and iso_pi(sk)-\u003esrc_type without holding lock_sock().\n\nThese fields may be modified concurrently by connect() or setsockopt()\non the same socket, resulting in data-races reported by KCSAN.\n\nFix this by snapshotting the required fields under lock_sock() before\ncalling hci_get_route().\n\nBUG: KCSAN: data-race in memcmp+0x45/0xb0\n\nrace at unknown origin, with read to 0xffff8880122135cf of 1 bytes\nby task 333 on cpu 1:\n memcmp+0x45/0xb0\n hci_get_route+0x27e/0x490\n iso_connect_cis+0x4c/0xa10\n iso_sock_connect+0x60e/0xb30\n __sys_connect_file+0xbd/0xe0\n __sys_connect+0xe0/0x110\n __x64_sys_connect+0x40/0x50\n x64_sys_call+0xcad/0x1c60\n do_syscall_64+0x133/0x590\n entry_SYSCALL_64_after_hwframe+0x77/0x7f",
  "id": "CVE-2026-63871",
  "modified": "2026-08-12T03:51:47.027028206Z",
  "published": "2026-07-19T14:18:39.787Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63871.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63871"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls"
}