{"id":"CVE-2021-47554","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nvdpa_sim: avoid putting an uninitialized iova_domain\n\nThe system will crash if we put an uninitialized iova_domain, this\ncould happen when an error occurs before initializing the iova_domain\nin vdpasim_create().\n\nBUG: kernel NULL pointer dereference, address: 0000000000000000\n...\nRIP: 0010:__cpuhp_state_remove_instance+0x96/0x1c0\n...\nCall Trace:\n \u003cTASK\u003e\n put_iova_domain+0x29/0x220\n vdpasim_free+0xd1/0x120 [vdpa_sim]\n vdpa_release_dev+0x21/0x40 [vdpa]\n device_release+0x33/0x90\n kobject_release+0x63/0x160\n vdpasim_create+0x127/0x2a0 [vdpa_sim]\n vdpasim_net_dev_add+0x7d/0xfe [vdpa_sim_net]\n vdpa_nl_cmd_dev_add_set_doit+0xe1/0x1a0 [vdpa]\n genl_family_rcv_msg_doit+0x112/0x140\n genl_rcv_msg+0xdf/0x1d0\n ...\n\nSo we must make sure the iova_domain is already initialized before\nput it.\n\nIn addition, we may get the following warning in this case:\nWARNING: ... drivers/iommu/iova.c:344 iova_cache_put+0x58/0x70\n\nSo we must make sure the iova_cache_put() is invoked only if the\niova_cache_get() is already invoked. Let's fix it together.","modified":"2026-03-13T05:16:32.856579Z","published":"2024-05-24T15:15:20.160Z","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"],"references":[{"type":"FIX","url":"https://git.kernel.org/stable/c/bb93ce4b150dde79f58e34103cbd1fe829796649"},{"type":"FIX","url":"https://git.kernel.org/stable/c/e4d58ac67e63727aa45a4a26185876f598e8b3dd"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47554.json","unresolved_ranges":[{"events":[{"introduced":"5.13"},{"fixed":"5.15.6"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc1"}]},{"events":[{"introduced":"0"},{"last_affected":"5.16-rc2"}]}]}}],"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"}]}