CVE-2024-50298

/// Technical description

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] rtnetli

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References