{"id":"DEBIAN-CVE-2023-52574","details":"In the Linux kernel, the following vulnerability has been resolved:  team: fix null-ptr-deref when team device type is changed  Get a null-ptr-deref bug as follows with reproducer [1].  BUG: kernel NULL pointer dereference, address: 0000000000000228 ... RIP: 0010:vlan_dev_hard_header+0x35/0x140 [8021q] ... Call Trace:  \u003cTASK\u003e  ? __die+0x24/0x70  ? page_fault_oops+0x82/0x150  ? exc_page_fault+0x69/0x150  ? asm_exc_page_fault+0x26/0x30  ? vlan_dev_hard_header+0x35/0x140 [8021q]  ? vlan_dev_hard_header+0x8e/0x140 [8021q]  neigh_connected_output+0xb2/0x100  ip6_finish_output2+0x1cb/0x520  ? nf_hook_slow+0x43/0xc0  ? ip6_mtu+0x46/0x80  ip6_finish_output+0x2a/0xb0  mld_sendpack+0x18f/0x250  mld_ifc_work+0x39/0x160  process_one_work+0x1e6/0x3f0  worker_thread+0x4d/0x2f0  ? __pfx_worker_thread+0x10/0x10  kthread+0xe5/0x120  ? __pfx_kthread+0x10/0x10  ret_from_fork+0x34/0x50  ? __pfx_kthread+0x10/0x10  ret_from_fork_asm+0x1b/0x30  [1] $ teamd -t team0 -d -c '{\"runner\": {\"name\": \"loadbalance\"}}' $ ip link add name t-dummy type dummy $ ip link add link t-dummy name t-dummy.100 type vlan id 100 $ ip link add name t-nlmon type nlmon $ ip link set t-nlmon master team0 $ ip link set t-nlmon nomaster $ ip link set t-dummy up $ ip link set team0 up $ ip link set t-dummy.100 down $ ip link set t-dummy.100 master team0  When enslave a vlan device to team device and team device type is changed from non-ether to ether, header_ops of team device is changed to vlan_header_ops. That is incorrect and will trigger null-ptr-deref for vlan-\u003ereal_dev in vlan_dev_hard_header() because team device is not a vlan device.  Cache eth_header_ops in team_setup(), then assign cached header_ops to header_ops of team net device when its type is changed from non-ether to ether to fix the bug.","modified":"2026-09-15T09:02:48.160378136Z","published":"2024-03-02T22:15:49.393Z","upstream":["CVE-2023-52574"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-52574"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.64-1"}]}],"versions":["6.1.27-1","6.1.37-1","6.1.38-1","6.1.38-2","6.1.38-2~bpo11+1","6.1.38-3","6.1.38-4","6.1.38-4~bpo11+1","6.1.52-1","6.1.55-1","6.1.55-1~bpo11+1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52574.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52574.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.5.6-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-52574.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}