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FKIE_CVE-2026-63871

Vulnerability from fkie_nvd - Published: 2026-07-19 15:16 - Updated: 2026-07-27 17:44
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls iso_connect_bis(), iso_connect_cis(), iso_listen_bis(), and iso_conn_big_sync() call hci_get_route() using iso_pi(sk)->dst, iso_pi(sk)->src, and iso_pi(sk)->src_type without holding lock_sock(). These fields may be modified concurrently by connect() or setsockopt() on the same socket, resulting in data-races reported by KCSAN. Fix this by snapshotting the required fields under lock_sock() before calling hci_get_route(). BUG: KCSAN: data-race in memcmp+0x45/0xb0 race at unknown origin, with read to 0xffff8880122135cf of 1 bytes by task 333 on cpu 1: memcmp+0x45/0xb0 hci_get_route+0x27e/0x490 iso_connect_cis+0x4c/0xa10 iso_sock_connect+0x60e/0xb30 __sys_connect_file+0xbd/0xe0 __sys_connect+0xe0/0x110 __x64_sys_connect+0x40/0x50 x64_sys_call+0xcad/0x1c60 do_syscall_64+0x133/0x590 entry_SYSCALL_64_after_hwframe+0x77/0x7f
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "9798f7d41d85ff763afd1f1cc0533b5c416c8348",
              "status": "affected",
              "version": "241f51931c35085449502c10f64fb3ecd6e02171",
              "versionType": "git"
            },
            {
              "lessThan": "ab84fd7779a2a7ff5d2c8eac212c43733f56216e",
              "status": "affected",
              "version": "241f51931c35085449502c10f64fb3ecd6e02171",
              "versionType": "git"
            },
            {
              "lessThan": "859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020",
              "status": "affected",
              "version": "241f51931c35085449502c10f64fb3ecd6e02171",
              "versionType": "git"
            },
            {
              "lessThan": "9ca7053d6215d89c33f28893bfd1625a32919d3f",
              "status": "affected",
              "version": "241f51931c35085449502c10f64fb3ecd6e02171",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "c524f9561c657b8af26dd4f67092b8928261aa62",
              "versionType": "git"
            },
            {
              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.9",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.2"
            },
            {
              "lessThan": "6.2",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.94",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.36",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.13",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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",
  "lastModified": "2026-07-27T17:44:23.777",
  "metrics": {},
  "published": "2026-07-19T15:16:54.133",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}



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