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:

? __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->real_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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2023-52574
• https://git.kernel.org/stable/c/1779eb51b9cc628cee551f252701a85a2a50a457
• https://git.kernel.org/stable/c/2f0acb0736ecc3eb85dc80ad2790d634dcb10b58
• https://git.kernel.org/stable/c/492032760127251e5540a5716a70996bacf2a3fd
• https://git.kernel.org/stable/c/a7fb47b9711101d2405b0eb1276fb1f9b9b270c7
• https://git.kernel.org/stable/c/b44dd92e2afd89eb6e9d27616858e72a67bdc1a7
• https://git.kernel.org/stable/c/c5f6478686bb45f453031594ae19b6c9723a780d
• https://git.kernel.org/stable/c/cac50d9f5d876be32cb9aa21c74018468900284d
• https://git.kernel.org/stable/c/cd05eec2ee0cc396813a32ef675634e403748255