CVE-2026-63946 (GCVE-0-2026-63946)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
VLAI
Title
Bluetooth: ISO: fix UAF in iso_recv_frame
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: fix UAF in iso_recv_frame iso_recv_frame reads conn->sk under iso_conn_lock but releases the lock before using sk, with no reference held. A concurrent iso_sock_kill() can free sk in that window, causing use-after-free on sk->sk_state and sock_queue_rcv_skb(). Fix by replacing the bare pointer read with iso_sock_hold(conn), which calls sock_hold() while the spinlock is held, atomically elevating the refcount before the lock drops. Add a drop_put label so sock_put() is called on all exit paths where the hold succeeded.
Severity
8.8 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < c57ea90f203c8b8b41a474f19a09000d0f841436 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 119fb6f80c44dc1c65d604cf28e64c56bd9b6568 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < b04ec131325baf4ea4577d6c6e6b86cf092e3731 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < c318aa51830a3d2cc1229968fe521441c97356cd (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 1a6b803b00ccdd7666506adbe01ddae1c72d1ca9 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 47f23a259517abbdb8032c057a1e8a6bf3734878 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.176 , ≤ 6.1.* (semver)
Unaffected: 6.6.143 , ≤ 6.6.* (semver)
Unaffected: 6.12.93 , ≤ 6.12.* (semver)
Unaffected: 6.18.35 , ≤ 6.18.* (semver)
Unaffected: 7.0.12 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
            "net/bluetooth/iso.c"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: fix UAF in iso_recv_frame\n\niso_recv_frame reads conn-\u003esk under iso_conn_lock but releases the lock\nbefore using sk, with no reference held. A concurrent iso_sock_kill()\ncan free sk in that window, causing use-after-free on sk-\u003esk_state and\nsock_queue_rcv_skb().\n\nFix by replacing the bare pointer read with iso_sock_hold(conn), which\ncalls sock_hold() while the spinlock is held, atomically elevating the\nrefcount before the lock drops. Add a drop_put label so sock_put() is\ncalled on all exit paths where the hold succeeded."
        }
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      "providerMetadata": {
        "dateUpdated": "2026-07-20T13:41:47.085Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        {
          "url": "https://git.kernel.org/stable/c/47f23a259517abbdb8032c057a1e8a6bf3734878"
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      "title": "Bluetooth: ISO: fix UAF in iso_recv_frame",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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    "datePublished": "2026-07-19T14:55:40.577Z",
    "dateReserved": "2026-07-19T07:54:57.023Z",
    "dateUpdated": "2026-07-20T13:41:47.085Z",
    "state": "PUBLISHED"
  },
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T14:44:50+00:00",
      "cve": "CVE-2026-63946",
      "id": "CVE-2026-63946",
      "initial_release_date": "2026-07-19T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Bluetooth: ISO: fix UAF in iso_recv_frame",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63946.json",
      "version": "3"
    }
  }
}



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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.