{"id":"CVE-2021-47559","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()\n\nCoverity reports a possible NULL dereferencing problem:\n\nin smc_vlan_by_tcpsk():\n6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times).\n7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next.\n1623                ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower);\nCID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS)\n8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev.\n1624                if (is_vlan_dev(ndev)) {\n\nRemove the manual implementation and use netdev_walk_all_lower_dev() to\niterate over the lower devices. While on it remove an obsolete function\nparameter comment.","modified":"2026-03-14T11:19:15.866579Z","published":"2024-05-24T15:15:20.537Z","related":["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","SUSE-SU-2024:2892-1","SUSE-SU-2024:2901-1","SUSE-SU-2024:2940-1"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8"},{"type":"FIX","url":"https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1"},{"type":"FIX","url":"https://git.kernel.org/stable/c/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff"}],"affected":[{"database_specific":{"unresolved_ranges":[{"events":[{"introduced":"4.18"},{"fixed":"5.10.83"}]},{"events":[{"introduced":"5.11"},{"fixed":"5.15.6"}]}],"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47559.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}