CVE-2026-63871 (GCVE-0-2026-63871)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:18 – Updated: 2026-07-19 14:18
VLAI
Title
Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls
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
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 241f51931c35085449502c10f64fb3ecd6e02171 , < 9798f7d41d85ff763afd1f1cc0533b5c416c8348 (git)
Affected: 241f51931c35085449502c10f64fb3ecd6e02171 , < ab84fd7779a2a7ff5d2c8eac212c43733f56216e (git)
Affected: 241f51931c35085449502c10f64fb3ecd6e02171 , < 859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020 (git)
Affected: 241f51931c35085449502c10f64fb3ecd6e02171 , < 9ca7053d6215d89c33f28893bfd1625a32919d3f (git)
Affected: c524f9561c657b8af26dd4f67092b8928261aa62 (git)
Affected: 6.1.9 , < 6.2 (semver)
Create a notification for this product.
Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.12.94 , ≤ 6.12.* (semver)
Unaffected: 6.18.36 , ≤ 6.18.* (semver)
Unaffected: 7.0.13 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.94",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.36",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.13",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "6.1.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T14:18:39.787Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/9798f7d41d85ff763afd1f1cc0533b5c416c8348"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab84fd7779a2a7ff5d2c8eac212c43733f56216e"
        },
        {
          "url": "https://git.kernel.org/stable/c/859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020"
        },
        {
          "url": "https://git.kernel.org/stable/c/9ca7053d6215d89c33f28893bfd1625a32919d3f"
        }
      ],
      "title": "Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63871",
    "datePublished": "2026-07-19T14:18:39.787Z",
    "dateReserved": "2026-07-19T07:54:57.017Z",
    "dateUpdated": "2026-07-19T14:18:39.787Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-63871",
      "date": "2026-08-10",
      "epss": "0.00157",
      "percentile": "0.05313"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-20T14:42:49.000Z",
      "cve": "CVE-2026-63871",
      "id": "msrc_CVE-2026-63871",
      "initial_release_date": "2026-07-20T01:03:35.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-63871.json",
      "version": "2"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-63871\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T15:16:54.133\",\"lastModified\":\"2026-07-27T17:44:23.777\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"241f51931c35085449502c10f64fb3ecd6e02171\",\"lessThan\":\"9798f7d41d85ff763afd1f1cc0533b5c416c8348\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"241f51931c35085449502c10f64fb3ecd6e02171\",\"lessThan\":\"ab84fd7779a2a7ff5d2c8eac212c43733f56216e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"241f51931c35085449502c10f64fb3ecd6e02171\",\"lessThan\":\"859bb1f4cb615d98c9c1ab2bd76ebb0b8fe46020\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"241f51931c35085449502c10f64fb3ecd6e02171\",\"lessThan\":\"9ca7053d6215d89c33f28893bfd1625a32919d3f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c524f9561c657b8af26dd4f67092b8928261aa62\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.1.9\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/bluetooth/iso.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"6.2\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.2\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.94\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.36\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.13\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-21T19:36:27+00:00",
      "cve": "CVE-2026-63871",
      "id": "CVE-2026-63871",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: ISO: Fix data-race on iso_pi fields in hci_get_route calls",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63871.json",
      "version": "3"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.