CVE-2026-63945 (GCVE-0-2026-63945)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-07-20 13:41
VLAI
Title
Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock
Summary
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock iso_sock_close() calls iso_sock_clear_timer() before acquiring lock_sock(sk). iso_sock_clear_timer() reads iso_pi(sk)->conn twice without the socket lock held: if (!iso_pi(sk)->conn) return; cancel_delayed_work(&iso_pi(sk)->conn->timeout_work); Concurrently, iso_conn_del() executes under lock_sock(sk) and calls iso_chan_del(), which sets iso_pi(sk)->conn to NULL and may result in the final reference to the connection being dropped: CPU0 CPU1 ---- ---- iso_sock_clear_timer() if (conn != NULL) ... lock_sock(sk) iso_chan_del() iso_pi(sk)->conn = NULL cancel_delayed_work(conn) /* NULL deref or UAF */ iso_pi(sk)->conn is not stable across the unlock window, causing a NULL pointer dereference or use-after-free. Serialize iso_sock_clear_timer() with the socket lock by moving it inside lock_sock()/release_sock(), matching the pattern used in iso_conn_del() and all other call sites.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < d9cbf7144ec589a3f0cc91f74a1a1af2d2b14afa (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 35f68f36d9883d56dec21cf85f7556d4657fc393 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 996c2104d0726a8fe584f85b3d6327197374a348 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < bc08c15746f25f41dd0508b25780d1e84acbb2ef (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 51cb9dcfdf9a1bccf312ab2ae4b62db629f7dcd5 (git)
Affected: ccf74f2390d60a2f9a75ef496d2564abb478f46a , < 4b5f8e608749b7e8fa386c6e4301cf9272595859 (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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{
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          "product": "Linux",
          "programFiles": [
            "net/bluetooth/iso.c"
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: ISO: serialize iso_sock_clear_timer with socket lock\n\niso_sock_close() calls iso_sock_clear_timer() before acquiring\nlock_sock(sk).\n\niso_sock_clear_timer() reads iso_pi(sk)-\u003econn twice without the\nsocket lock held:\n\n    if (!iso_pi(sk)-\u003econn)\n        return;\n    cancel_delayed_work(\u0026iso_pi(sk)-\u003econn-\u003etimeout_work);\n\nConcurrently, iso_conn_del() executes under lock_sock(sk) and calls\niso_chan_del(), which sets iso_pi(sk)-\u003econn to NULL and may result in\nthe final reference to the connection being dropped:\n\n    CPU0                         CPU1\n    ----                         ----\n    iso_sock_clear_timer()\n      if (conn != NULL) ...      lock_sock(sk)\n                                   iso_chan_del()\n                                   iso_pi(sk)-\u003econn = NULL\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\n\niso_pi(sk)-\u003econn is not stable across the unlock window, causing a\nNULL pointer dereference or use-after-free.\n\nSerialize iso_sock_clear_timer() with the socket lock by moving it\ninside lock_sock()/release_sock(), matching the pattern used in\niso_conn_del() and all other call sites."
        }
      ],
      "metrics": [
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            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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          "url": "https://git.kernel.org/stable/c/4b5f8e608749b7e8fa386c6e4301cf9272595859"
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      "title": "Bluetooth: ISO: serialize iso_sock_clear_timer with socket lock",
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        "engine": "bippy-1.2.0"
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    "datePublished": "2026-07-19T14:55:39.859Z",
    "dateReserved": "2026-07-19T07:54:57.022Z",
    "dateUpdated": "2026-07-20T13:41:46.058Z",
    "state": "PUBLISHED"
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               ----\\n    iso_sock_clear_timer()\\n      if (conn != NULL) ...      lock_sock(sk)\\n                                   iso_chan_del()\\n                                   iso_pi(sk)-\u003econn = NULL\\n      cancel_delayed_work(conn)  /* NULL deref or UAF */\\n\\niso_pi(sk)-\u003econn is not stable across the unlock window, causing a\\nNULL pointer dereference or use-after-free.\\n\\nSerialize iso_sock_clear_timer() with the socket lock by moving it\\ninside lock_sock()/release_sock(), matching the pattern used in\\niso_conn_del() and all other call 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  }
}



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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

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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.