{"id":"CVE-2021-47459","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv\n\nIt will trigger UAF for rx_kref of j1939_priv as following.\n\n        cpu0                                    cpu1\nj1939_sk_bind(socket0, ndev0, ...)\nj1939_netdev_start\n                                        j1939_sk_bind(socket1, ndev0, ...)\n                                        j1939_netdev_start\nj1939_priv_set\n                                        j1939_priv_get_by_ndev_locked\nj1939_jsk_add\n.....\nj1939_netdev_stop\nkref_put_lock(&priv-\u003erx_kref, ...)\n                                        kref_get(&priv-\u003erx_kref, ...)\n                                        REFCOUNT_WARN(\"addition on 0;...\")\n\n====================================================\nrefcount_t: addition on 0; use-after-free.\nWARNING: CPU: 1 PID: 20874 at lib/refcount.c:25 refcount_warn_saturate+0x169/0x1e0\nRIP: 0010:refcount_warn_saturate+0x169/0x1e0\nCall Trace:\n j1939_netdev_start+0x68b/0x920\n j1939_sk_bind+0x426/0xeb0\n ? security_socket_bind+0x83/0xb0\n\nThe rx_kref's kref_get() and kref_put() should use j1939_netdev_lock to\nprotect.","modified":"2026-03-15T14:09:23.968835Z","published":"2024-05-22T07:15:10.863Z","related":["ALSA-2024:4928","SUSE-SU-2024:2008-1","SUSE-SU-2024:2011-1","SUSE-SU-2024:2019-1","SUSE-SU-2024:2189-1","SUSE-SU-2024:2190-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/6e8811707e2df0c6ba920f0cad3a3bca7b42132f"},{"type":"FIX","url":"https://git.kernel.org/stable/c/864e77771a24c877aaf53aee019f78619cbcd668"},{"type":"FIX","url":"https://git.kernel.org/stable/c/a0e47d2833b4f65e6c799f28c6b636d36b8b936d"},{"type":"FIX","url":"https://git.kernel.org/stable/c/d9d52a3ebd284882f5562c88e55991add5d01586"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47459.json","unresolved_ranges":[{"events":[{"introduced":"5.4"},{"fixed":"5.4.156"}]},{"events":[{"introduced":"5.5"},{"fixed":"5.10.76"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.14.15"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc2"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc3"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc4"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc5"}]},{"events":[{"introduced":"0"},{"last_affected":"5.15-rc6"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}