{
  "cveId": "CVE-2026-80819",
  "url": "https://patchblox.com/security/cve/CVE-2026-80819",
  "summary": "CVE-2026-80819 is fixed in 50 products on 1 platform, first by DEBIAN-CVE-2026-80819, released September 5, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: RFCOMM: take rfcomm_mutex for the deferred setup accept  rfcomm_sock_recvmsg() completes a deferred setup by calling rfcomm_dlc_accept() without holding any RFCOMM lock:  \tif (test_and_clear_bit(RFCOMM_DEFER_SETUP, \u0026d-\u003Eflags)) { \t\trfcomm_dlc_accept(d); \t\treturn 0; \t}  and rfcomm_dlc_accept() dereferences the session on its first line:  \tstruct sock *sk = d-\u003Esession-\u003Esock-\u003Esk;  Every other path that touches d-\u003Esession runs under rfcomm_mutex: rfcomm_dlc_open(), rfcomm_dlc_close(), rfcomm_dlc_exists(), rfcomm_dlc_send_rpn(), and the RFCOMM thread through rfcomm_process_sessions(). rfcomm_connect_ind() is even documented as \u0022called under rfcomm_lock()\u0022. This call site is the only one that skips it.  The RFCOMM_DEFER_SETUP bit looks like it serialises the accept against teardown, since __rfcomm_dlc_close() returns early when it wins the test_and_clear. But rfcomm_recv_disc() forces the state first:  \td-\u003Estate = BT_CLOSED; \t__rfcomm_dlc_close(d, err);  and the early return only covers BT_CONNECT, BT_CONFIG, BT_OPEN and BT_CONNECT2. With the state already BT_CLOSED that switch does not match, the bit is never consulted, and __rfcomm_dlc_close() falls through to rfcomm_dlc_unlink(), which sets d-\u003Esession = NULL.  So a remote DISC on a deferred dlc clears the session while leaving RFCOMM_DEFER_SETUP set. The next recvmsg() then passes the test_and_clear and dereferences a NULL session. No timing window is needed: once the DISC has been processed, the dereference is unconditional.  Give rfcomm_dlc_accept() the same shape as rfcomm_dlc_open() and rfcomm_dlc_close(): an exported wrapper that takes rfcomm_mutex and re-checks the session, around a __rfcomm_dlc_accept() that the two in-core callers, which already hold the mutex, keep using.  Reproduced on a KASAN \u002B PROVE_LOCKING kernel with a BR/EDR peer emulated over /dev/vhci: the peer brings up an ACL link, opens L2CAP on the RFCOMM PSM, starts a session, opens a dlc on a channel bound with BT_DEFER_SETUP, and sends DISC after the socket is accepted. recv() on the accepted socket then hits:    Oops: general protection fault   KASAN: null-ptr-deref in range [0x0000000000000010-0x0000000000000017]   RIP: 0010:rfcomm_dlc_accept\u002B0x54/0x350   Call Trace:     rfcomm_sock_recvmsg\u002B0x1cd/0x230     sock_recvmsg\u002B0x166/0x1c0     __sys_recvfrom\u002B0x20d/0x300  0x10 is the offset of sock in struct rfcomm_session. With this patch the same run completes with recv() returning 0 and no report, and lockdep stays quiet, confirming rfcomm_mutex is still taken before lock_sock on this path as it is on the thread side.",
  "published": "2026-09-04T16:18:09Z",
  "severity": "Moderate",
  "cvss": 7.8,
  "epss": 0.00195,
  "epssPercentile": 0.09272,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80819",
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