CVE-2024-53088

In the Linux kernel, the following vulnerability has been resolved:

i40e: fix race condition by adding filter's intermediate sync state

Fix a race condition in the i40e driver that leads to MAC/VLAN filters

becoming corrupted and leaking. Address the issue that occurs under

heavy load when multiple threads are concurrently modifying MAC/VLAN

filters by setting mac and port VLAN.

1. Thread T0 allocates a filter in i40e_add_filter() within

i40e_ndo_set_vf_port_vlan().

2. Thread T1 concurrently frees the filter in __i40e_del_filter() within

i40e_ndo_set_vf_mac().

3. Subsequently, i40e_service_task() calls i40e_sync_vsi_filters(), which

refers to the already freed filter memory, causing corruption.

Reproduction steps:

1. Spawn multiple VFs.

2. Apply a concurrent heavy load by running parallel operations to change

MAC addresses on the VFs and change port VLANs on the host.

3. Observe errors in dmesg:

"Error I40E_AQ_RC_ENOSPC adding RX filters on VF XX,

please set promiscuous on manually for VF XX".

Exact code for stable reproduction Intel can't open-source now.

The fix involves implementing a new intermediate filter state,

I40E_FILTER_NEW_SYNC, for the time when a filter is on a tmp_add_list.

These filters cannot be deleted from the hash list directly but

must be removed using the full process.