In the Linux kernel, the following vulnerability has been resolved: net: enetc: allocate vf_state during PF probes In the previous implementation, vf_state is allocated memory only when VF is enabled. However, net_device_ops::ndo_set_vf_mac() may be called before VF is enabled to configure the MAC address of VF. If this is the case, enetc_pf_set_vf_mac() will access vf_state, resulting in access to a null pointer. The simplified error log is as follows. root@ls1028ardb:~# ip link set eno0 vf 1 mac 00:0c:e7:66:77:89 [ 173.543315] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000004 [ 173.637254] pc : enetc_pf_set_vf_mac+0x3c/0x80 Message from sy [ 173.641973] lr : do_setlink+0x4a8/0xec8 [ 173.732292] Call trace: [ 173.734740] enetc_pf_set_vf_mac+0x3c/0x80 [ 173.738847] __rtnl_newlink+0x530/0x89c [ 173.742692] rtnl_newlink+0x50/0x7c [ 173.746189] rtnetlink_rcv_msg+0x128/0x390 [ 173.750298] netlink_rcv_skb+0x60/0x130 [ 173.754145] rtnetlink_rcv+0x18/0x24 [ 173.757731] netlink_unicast+0x318/0x380 [ 173.761665] netlink_sendmsg+0x17c/0x3c8
En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: enetc: asignar vf_state durante los sondeos de PF En la implementación anterior, a vf_state se le asigna memoria solo cuando VF está habilitado. Sin embargo, se puede llamar a net_device_ops::ndo_set_vf_mac() antes de que VF esté habilitado para configurar la dirección MAC de VF. Si este es el caso, enetc_pf_set_vf_mac() accederá a vf_state, lo que dará como resultado el acceso a un puntero nulo. El registro de errores simplificado es el siguiente. root@ls1028ardb:~# ip link set eno0 vf 1 mac 00:0c:e7:66:77:89 [ 173.543315] No se puede manejar la desreferencia del puntero NULL del núcleo en la dirección virtual 0000000000000004 [ 173.637254] pc : enetc_pf_set_vf_mac+0x3c/0x80 Mensaje de sy [ 173.641973] lr : do_setlink+0x4a8/0xec8 [ 173.732292] Rastreo de llamada: [ 173.734740] enetc_pf_set_vf_mac+0x3c/0x80 [ 173.738847] __rtnl_newlink+0x530/0x89c [ 173.742692] rtnl_newlink+0x50/0x7c [ 173.746189] rtnetlink_rcv_msg+0x128/0x390 [ 173.750298] netlink_rcv_skb+0x60/0x130 [ 173.754145] rtnetlink_rcv+0x18/0x24 [ 173.757731] netlink_unicast+0x318/0x380 [ 173.761665] netlink_sendmsg+0x17c/0x3c8
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
| Attack Vector | LOCAL |
|---|---|
| Attack Complexity | LOW |
| Privileges Required | LOW |
| User Interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality Impact | NONE |
| Integrity Impact | NONE |
| Availability Impact | HIGH |
| Source | Type | Description |
|---|---|---|
| [email protected] | Primary |
en
CWE-476
|
| 134c704f-9b21-4f2e-91b3-4a467353bcc0 | Secondary |
en
CWE-476
|
| Vendor | Product | Version | Update | Type |
|---|---|---|---|---|
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bdd6a42c0> | Operating System |
| linux | linux_kernel | * | <built-in method update of dict object at 0x702bdd6a4100> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdc9f6500> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdc3f4640> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdd6a5dc0> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdd6a5780> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdc9f48c0> | Operating System |
| linux | linux_kernel | 6.12 | <built-in method update of dict object at 0x702bdc9f6bc0> | Operating System |
| Vulnerable | CPE |
|---|---|
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc1:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc2:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc3:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc4:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc5:*:*:*:*:*:* |
| Yes | cpe:2.3:o:linux:linux_kernel:6.12:rc6:*:*:*:*:*:* |