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CVE-2026-80819: Linux

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CVSS

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Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

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    Описание

    Оригинално описание

    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: if (test_and_clear_bit(RFCOMM_DEFER_SETUP, &d->flags)) { rfcomm_dlc_accept(d); return 0; } and rfcomm_dlc_accept() dereferences the session on its first line: struct sock *sk = d->session->sock->sk; Every other path that touches d->session 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 "called under rfcomm_lock()". 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: d->state = BT_CLOSED; __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->session = 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 + 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 s

    Засегнати продукти

    • Linux Linux: bb23c0ab824653be4aa7dfca15b07b3059717004 преди d8d686dd5662a7c4745e4515f1237a9f3b7df181; bb23c0ab824653be4aa7dfca15b07b3059717004 преди eb71d5a1ea8ff2683e394b48ae3cd676037ab4c2; bb23c0ab824653be4aa7dfca15b07b3059717004 преди 56f0aa75c7640e46397ef73bea251fcbef9150c0; bb23c0ab824653be4aa7dfca15b07b3059717004 преди 362726c9c6e56eea4262109183e49868c39ccd3a; bb23c0ab824653be4aa7dfca15b07b3059717004 преди 825b95561d7b7c393df9e7bc295451aaeadc3d18; bb23c0ab824653be4aa7dfca15b07b3059717004 преди d4b1a13b1eff2e80925c7368ffdeaaa50cba93df; bb23c0ab824653be4aa7dfca15b07b3059717004 преди 355bfd57ca4ca881c6eb03ca813b440a094b1f44; bb23c0ab824653be4aa7dfca15b07b3059717004 преди b405c2f96ae2e37375105881890f7738833b1d62; bb23c0ab824653be4aa7dfca15b07b3059717004 преди 43a556b2fd43f2df6dded59c2e26560a27874c24
    • Linux Linux: 2.6.30; преди 2.6.30; 5.10.267 до 5.10.*; 5.15.218 до 5.15.*; 6.1.185 до 6.1.*; 6.6.154 до 6.6.*; 6.12.106 до 6.12.*; 6.18.47 до 6.18.*; 7.1.11 до 7.1.*; 7.2.1 до 7.2.*; от 7.3 нататък

    История

    • 4 септември 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-80819: Linux | freedomonline.bg