{"id":"CVE-2023-52574","summary":"team: fix null-ptr-deref when team device type is changed","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nteam: fix null-ptr-deref when team device type is changed\n\nGet a null-ptr-deref bug as follows with reproducer [1].\n\nBUG: kernel NULL pointer dereference, address: 0000000000000228\n...\nRIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q]\n...\nCall Trace:\n \u003cTASK\u003e\n ? __die+0x24/0x70\n ? page_fault_oops+0x82/0x150\n ? exc_page_fault+0x69/0x150\n ? asm_exc_page_fault+0x26/0x30\n ? vlan_dev_hard_header+0x35/0x140 [8021q]\n ? vlan_dev_hard_header+0x8e/0x140 [8021q]\n neigh_connected_output+0xb2/0x100\n ip6_finish_output2+0x1cb/0x520\n ? nf_hook_slow+0x43/0xc0\n ? ip6_mtu+0x46/0x80\n ip6_finish_output+0x2a/0xb0\n mld_sendpack+0x18f/0x250\n mld_ifc_work+0x39/0x160\n process_one_work+0x1e6/0x3f0\n worker_thread+0x4d/0x2f0\n ? __pfx_worker_thread+0x10/0x10\n kthread+0xe5/0x120\n ? __pfx_kthread+0x10/0x10\n ret_from_fork+0x34/0x50\n ? __pfx_kthread+0x10/0x10\n ret_from_fork_asm+0x1b/0x30\n\n[1]\n$ teamd -t team0 -d -c '{\"runner\": {\"name\": \"loadbalance\"}}'\n$ ip link add name t-dummy type dummy\n$ ip link add link t-dummy name t-dummy.100 type vlan id 100\n$ ip link add name t-nlmon type nlmon\n$ ip link set t-nlmon master team0\n$ ip link set t-nlmon nomaster\n$ ip link set t-dummy up\n$ ip link set team0 up\n$ ip link set t-dummy.100 down\n$ ip link set t-dummy.100 master team0\n\nWhen enslave a vlan device to team device and team device type is changed\nfrom non-ether to ether, header_ops of team device is changed to\nvlan_header_ops. That is incorrect and will trigger null-ptr-deref\nfor vlan-\u003ereal_dev in vlan_dev_hard_header() because team device is not\na vlan device.\n\nCache eth_header_ops in team_setup(), then assign cached header_ops to\nheader_ops of team net device when its type is changed from non-ether\nto ether to fix the bug.","modified":"2026-04-11T12:46:32.844272Z","published":"2024-03-02T21:59:43.271Z","related":["ALSA-2024:2394","SUSE-SU-2024:0856-1","SUSE-SU-2024:0857-1","SUSE-SU-2024:0925-1","SUSE-SU-2024:0926-1","SUSE-SU-2024:0975-1","SUSE-SU-2024:0976-1","SUSE-SU-2024:1320-1","SUSE-SU-2024:1321-1","SUSE-SU-2024:1466-1","SUSE-SU-2024:1480-1","SUSE-SU-2024:1490-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52574.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58"},{"type":"WEB","url":"https://git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52574.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-52574"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1d76efe1577b4323609b1bcbfafa8b731eda071a"},{"fixed":"1779eb51b9cc628cee551f252701a85a2a50a457"},{"fixed":"a7fb47b9711101d2405b0eb1276fb1f9b9b270c7"},{"fixed":"c5f6478686bb45f453031594ae19b6c9723a780d"},{"fixed":"b44dd92e2afd89eb6e9d27616858e72a67bdc1a7"},{"fixed":"cd05eec2ee0cc396813a32ef675634e403748255"},{"fixed":"2f0acb0736ecc3eb85dc80ad2790d634dcb10b58"},{"fixed":"cac50d9f5d876be32cb9aa21c74018468900284d"},{"fixed":"492032760127251e5540a5716a70996bacf2a3fd"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52574.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.7.0"},{"fixed":"4.14.327"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.15.0"},{"fixed":"4.19.296"}]},{"type":"ECOSYSTEM","events":[{"introduced":"4.20.0"},{"fixed":"5.4.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.198"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.134"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.56"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.5.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2023-52574.json"}}],"schema_version":"1.7.5"}