{
  "cveId": "CVE-2026-90091",
  "url": "https://patchblox.com/security/cve/CVE-2026-90091",
  "summary": "CVE-2026-90091 is fixed in 37 products on 1 platform, first by DEBIAN-CVE-2026-90091, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Bluetooth: L2CAP: fix race l2cap_sock_cleanup_listen() vs. put_chan",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: fix race l2cap_sock_cleanup_listen() vs. put_chan  For L2CAP sockets without owning sk-\u003Esk_socket, reading l2cap_pi(sk)-\u003Echan may race against concurrent l2cap_sock_kill() -\u003E l2cap_sock_put_chan().  This excludes simultaneous proto_ops callbacks, but access in l2cap_sock_cleanup_listen() has unsafe lockless read.   [Task 1]                         [Task 2 (hdev-\u003Eworkqueue)]  l2cap_sock_release(parent)       l2cap_disconn_cfm    l2cap_sock_cleanup_listen        l2cap_conn_del      bt_accept_dequeue                l2cap_chan_del        lock_sock(sk)                    l2cap_sock_teardown_cb        bt_accept_unlink          bt_sk(sk)-\u003Eparent = NULL        release_sock(sk) ----------------\u003E lock_sock(sk)                                           parent = /* NULL */      lock_sock(sk) \u003C--------------------- release_sock(sk)                                           sock_set_flag(sk, SOCK_ZAPPED)                                       l2cap_sock_close_cb                                         l2cap_sock_kill(sk)                                           l2cap_sock_put_chan      chan = READ l2cap_pi(sk)-\u003Echan         l2cap_pi(sk)-\u003Echan = NULL      l2cap_chan_hold_unless_zero            l2cap_put_chan(chan)        kref_get_unless_zero(\u0026chan-\u003Eref)  Task 1 may observe NULL which causes null-ptr-deref.  Fix the race by taking lock_sock() in l2cap_sock_kill() to synchronize with l2cap_sock_cleanup_listen().  hold_unless_zero() is not needed here, l2cap_pi(sk)-\u003Echan owns reference if it is non-NULL.  Clarify code comments vs. locking.",
  "published": "2026-09-17T17:17:00Z",
  "severity": "Moderate",
  "cvss": 8,
  "cvssVector": "CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00362,
  "epssPercentile": 0.30229,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90091",
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