In the Linux kernel, the following vulnerability has been resolved:
net: fix NULL pointer dereference in l3mdevl3rcv
When delete l3s ipvlan:
ip link del link eth0 ipvlan1 type ipvlan mode l3s
This may cause a null pointer dereference:
Call trace:
ip_rcv_finish+0x48/0xd0
ip_rcv+0x5c/0x100
__netif_receive_skb_one_core+0x64/0xb0
__netif_receive_skb+0x20/0x80
process_backlog+0xb4/0x204
napi_poll+0xe8/0x294
net_rx_action+0xd8/0x22c
__do_softirq+0x12c/0x354
This is because l3mdevl3rcv() visit dev->l3mdevops after ipvlanl3sunregister() assign the dev->l3mdevops to NULL. The process like this:
(CPU1) | (CPU2)
l3mdev_l3_rcv() |
check dev->priv_flags: |
master = skb->dev; |
|
| ipvlan_l3s_unregister()
| set dev->priv_flags
| dev->l3mdev_ops = NULL;
|
visit master->l3mdev_ops |
To avoid this by do not set dev->l3mdev_ops when unregister l3s ipvlan.
[
{
"id": "CVE-2025-22103-34208e6d",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c"
},
"digest": {
"threshold": 0.9,
"line_hashes": [
"44644025978077122225966742693320701544",
"113441011989748530565534543312369282928"
]
},
"deprecated": false,
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f9dff65140efc289f01bcf39c3ca66a8806b6132",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-46465149",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c",
"function": "ipvlan_l3s_unregister"
},
"digest": {
"function_hash": "111927875538803139961480468014245213658",
"length": 197.0
},
"deprecated": false,
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@f9dff65140efc289f01bcf39c3ca66a8806b6132",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-524edb6d",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c"
},
"digest": {
"threshold": 0.9,
"line_hashes": [
"44644025978077122225966742693320701544",
"113441011989748530565534543312369282928"
]
},
"deprecated": false,
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@52b44d8c653459c658b733d13658afdde45f6836",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-97344a7c",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c"
},
"digest": {
"threshold": 0.9,
"line_hashes": [
"44644025978077122225966742693320701544",
"113441011989748530565534543312369282928"
]
},
"deprecated": false,
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@59599bce44af3df7a215ebc81cb166426e1c9204",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-9f48cdbb",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c",
"function": "ipvlan_l3s_unregister"
},
"digest": {
"function_hash": "111927875538803139961480468014245213658",
"length": 197.0
},
"deprecated": false,
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@52b44d8c653459c658b733d13658afdde45f6836",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-dccbfc43",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c",
"function": "ipvlan_l3s_unregister"
},
"digest": {
"function_hash": "111927875538803139961480468014245213658",
"length": 197.0
},
"deprecated": false,
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@59599bce44af3df7a215ebc81cb166426e1c9204",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-e447aa8a",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c"
},
"digest": {
"threshold": 0.9,
"line_hashes": [
"44644025978077122225966742693320701544",
"113441011989748530565534543312369282928"
]
},
"deprecated": false,
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@0032c99e83b9ce6d5995d65900aa4b6ffb501cce",
"signature_version": "v1"
},
{
"id": "CVE-2025-22103-faa07b44",
"target": {
"file": "drivers/net/ipvlan/ipvlan_l3s.c",
"function": "ipvlan_l3s_unregister"
},
"digest": {
"function_hash": "111927875538803139961480468014245213658",
"length": 197.0
},
"deprecated": false,
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@0032c99e83b9ce6d5995d65900aa4b6ffb501cce",
"signature_version": "v1"
}
]