Vulnerability-Lookup

CVE-2026-64404 (GCVE-0-2026-64404)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:50 – Updated: 2026-07-25 08:50

Title

Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()

Summary

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync() iso_conn_big_sync() drops the socket lock to call hci_get_route() and then re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards without re-checking that conn is still valid. While the lock is dropped, the connection can be torn down under the same socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del() sets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also clear conn->hcon on its own). When iso_conn_big_sync() re-acquires the lock and reads conn->hcon, conn may be NULL, causing a NULL pointer dereference (hcon is the first member of struct iso_conn). This path is reached from iso_sock_recvmsg() for a PA-sync broadcast sink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock window can race with connection teardown driven by controller events. Re-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket lock and bail out if the connection went away, as already done in the sibling iso_sock_rebind_bc().

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/b3e647a4aa4d2d054…
https://git.kernel.org/stable/c/b84eeb7636d6962dd…
https://git.kernel.org/stable/c/01afd198c2c286cd3…
https://git.kernel.org/stable/c/d5541eb148da72d5e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5 , < b3e647a4aa4d2d054f86a783f5c426035e1dc237 (git) Affected: 7a17308c17880d259105f6e591eb1bc77b9612f0 , < b84eeb7636d6962dd882d5e0b31475e4f404313c (git) Affected: 7a17308c17880d259105f6e591eb1bc77b9612f0 , < 01afd198c2c286cd3b81f44d4e33a2e638711550 (git) Affected: 7a17308c17880d259105f6e591eb1bc77b9612f0 , < d5541eb148da72d5e0a1bca8ecd171f9fc8b366f (git) Affected: 6.12.6 , < 6.12.96 (semver)
Linux	Linux	Affected: 6.13 Unaffected: 0 , < 6.13 (semver) Unaffected: 6.12.96 , ≤ 6.12.* (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

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JSON

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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
          ],
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              "status": "affected",
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            },
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            },
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              "status": "affected",
              "version": "6.12.6",
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          ]
        },
        {
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          "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": "6.13"
            },
            {
              "lessThan": "6.13",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "6.12.6",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
                {
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                {
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              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)-\u003econn-\u003ehcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -\u003e iso_conn_del() -\u003e iso_chan_del()\nsets iso_pi(sk)-\u003econn to NULL (and the broadcast teardown path can also\nclear conn-\u003ehcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn-\u003ehcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)-\u003econn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-25T08:50:46.523Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237"
        },
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          "url": "https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c"
        },
        {
          "url": "https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550"
        },
        {
          "url": "https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f"
        }
      ],
      "title": "Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64404",
    "datePublished": "2026-07-25T08:50:46.523Z",
    "dateReserved": "2026-07-19T15:36:31.785Z",
    "dateUpdated": "2026-07-25T08:50:46.523Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-07-26",
      "epss": "0.00168",
      "percentile": "0.06414"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64404\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-25T10:17:24.003\",\"lastModified\":\"2026-07-25T10:17:24.003\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\\n\\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\\nthen re-acquires it, but dereferences iso_pi(sk)-\u003econn-\u003ehcon afterwards\\nwithout re-checking that conn is still valid.\\n\\nWhile the lock is dropped, the connection can be torn down under the\\nsame socket lock: iso_disconn_cfm() -\u003e iso_conn_del() -\u003e iso_chan_del()\\nsets iso_pi(sk)-\u003econn to NULL (and the broadcast teardown path can also\\nclear conn-\u003ehcon on its own). When iso_conn_big_sync() re-acquires the\\nlock and reads conn-\u003ehcon, conn may be NULL, causing a NULL pointer\\ndereference (hcon is the first member of struct iso_conn).\\n\\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\\nwindow can race with connection teardown driven by controller events.\\n\\nRe-validate iso_pi(sk)-\u003econn and its hcon after re-acquiring the socket\\nlock and bail out if the connection went away, as already done in the\\nsibling iso_sock_rebind_bc().\"}],\"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\":\"cbe640d6cae590b9a7d81ce86fe9a90e83eec1d5\",\"lessThan\":\"b3e647a4aa4d2d054f86a783f5c426035e1dc237\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a17308c17880d259105f6e591eb1bc77b9612f0\",\"lessThan\":\"b84eeb7636d6962dd882d5e0b31475e4f404313c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a17308c17880d259105f6e591eb1bc77b9612f0\",\"lessThan\":\"01afd198c2c286cd3b81f44d4e33a2e638711550\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7a17308c17880d259105f6e591eb1bc77b9612f0\",\"lessThan\":\"d5541eb148da72d5e0a1bca8ecd171f9fc8b366f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.12.6\",\"lessThan\":\"6.12.96\",\"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\":\"6.13\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"6.13\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.96\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.39\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.4\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2-rc3\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "suse_vex": {
      "aggregate_severity": "not set",
      "current_release_date": "2026-07-25T15:59:59Z",
      "cve": "CVE-2026-64404",
      "id": "CVE-2026-64404",
      "initial_release_date": "2026-07-25T15:59:59Z",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64404",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-64404.json",
      "version": "2"
    }
  }
}

GHSA-F6GP-JXPH-7WJ2

Vulnerability from github – Published: 2026-07-25 12:31 – Updated: 2026-07-25 12:31

Details

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()

iso_conn_big_sync() drops the socket lock to call hci_get_route() and then re-acquires it, but dereferences iso_pi(sk)->conn->hcon afterwards without re-checking that conn is still valid.

While the lock is dropped, the connection can be torn down under the same socket lock: iso_disconn_cfm() -> iso_conn_del() -> iso_chan_del() sets iso_pi(sk)->conn to NULL (and the broadcast teardown path can also clear conn->hcon on its own). When iso_conn_big_sync() re-acquires the lock and reads conn->hcon, conn may be NULL, causing a NULL pointer dereference (hcon is the first member of struct iso_conn).

This path is reached from iso_sock_recvmsg() for a PA-sync broadcast sink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock window can race with connection teardown driven by controller events.

Re-validate iso_pi(sk)->conn and its hcon after re-acquiring the socket lock and bail out if the connection went away, as already done in the sibling iso_sock_rebind_bc().

Show details on source website

JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-64404"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-07-25T10:17:24Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: avoid NULL deref of conn in iso_conn_big_sync()\n\niso_conn_big_sync() drops the socket lock to call hci_get_route() and\nthen re-acquires it, but dereferences iso_pi(sk)-\u003econn-\u003ehcon afterwards\nwithout re-checking that conn is still valid.\n\nWhile the lock is dropped, the connection can be torn down under the\nsame socket lock: iso_disconn_cfm() -\u003e iso_conn_del() -\u003e iso_chan_del()\nsets iso_pi(sk)-\u003econn to NULL (and the broadcast teardown path can also\nclear conn-\u003ehcon on its own). When iso_conn_big_sync() re-acquires the\nlock and reads conn-\u003ehcon, conn may be NULL, causing a NULL pointer\ndereference (hcon is the first member of struct iso_conn).\n\nThis path is reached from iso_sock_recvmsg() for a PA-sync broadcast\nsink socket (BT_SK_DEFER_SETUP | BT_SK_PA_SYNC), so the dropped-lock\nwindow can race with connection teardown driven by controller events.\n\nRe-validate iso_pi(sk)-\u003econn and its hcon after re-acquiring the socket\nlock and bail out if the connection went away, as already done in the\nsibling iso_sock_rebind_bc().",
  "id": "GHSA-f6gp-jxph-7wj2",
  "modified": "2026-07-25T12:31:34Z",
  "published": "2026-07-25T12:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64404"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/01afd198c2c286cd3b81f44d4e33a2e638711550"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b3e647a4aa4d2d054f86a783f5c426035e1dc237"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b84eeb7636d6962dd882d5e0b31475e4f404313c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d5541eb148da72d5e0a1bca8ecd171f9fc8b366f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-64404 (GCVE-0-2026-64404)

GHSA-F6GP-JXPH-7WJ2

Tags

Sightings

Nomenclature