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CVE-2026-53271: 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: ksmbd: fix NULL-deref of opinfo->conn in oplock/lease break notifiers smb2_oplock_break_noti() and smb2_lease_break_noti() read opinfo->conn into a local with neither READ_ONCE() nor a NULL check. Both run from oplock_break() after opinfo_get_list() has dropped ci->m_lock, so a concurrent SMB2 LOGOFF (session_fd_check()) can set op->conn = NULL under ci->m_lock within that window. ksmbd_conn_r_count_inc(conn) then writes through NULL at offset 0xc4 -- a remotely triggerable oops. Guard both reads the way compare_guid_key() already does: read opinfo->conn with READ_ONCE() and return early if it is NULL, before allocating the work struct so nothing leaks. A NULL conn means the client is gone and the break is moot, so return 0; oplock_break() treats that as success and runs the normal teardown.

    Засегнати продукти

    • Linux Linux: 8df4bcdb0a4232192b2445256c39b787d58ef14d преди 945a86b21b40fb17183f5b27461baa6f03e2467f; c8efcc786146a951091588e5fa7e3c754850cb3c преди 1ff58dcfcab434ebb51649da33774fbb8e1f7b67; c8efcc786146a951091588e5fa7e3c754850cb3c преди e735dbd489e3ea02be78dba991056fe1138be51e; c8efcc786146a951091588e5fa7e3c754850cb3c преди 75e33deda658c1ab3a9336cbdb1436536f9b3660; c8efcc786146a951091588e5fa7e3c754850cb3c преди b003086d76968298f22e7cf62239833b5a3a06b1; 6.6.32 преди 6.6.143
    • Linux Linux: 6.9; преди 6.9; 6.6.143 до 6.6.*; 6.12.94 до 6.12.*; 6.18.36 до 6.18.*; 7.0.13 до 7.0.*; 7.1 до *

    История

    • 25 юни 2026 Публикувано

    Други уязвимости в Linux Linux

    Първоизточници

    CVE-2026-53271: Linux | freedomonline.bg