net: hsr: fix memory leak on slave unregistration by removing synced VLANs

Summary

In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix memory leak on slave unregistration by removing synced VLANs When an HSR master device is brought UP, it auto-adds VLAN 0 via vlan_vid0_add(), which propagates VID 0 to its slave devices (slave A and B). If a slave device is later unregistered while HSR is active (e.g., during netns cleanup or interface destruction), hsr_del_port() is called to detach the slave port from the HSR master. However, hsr_del_port() currently does not delete the VLAN IDs that were synced to the slave device by HSR. As a result, the slave device retains a refcount on VID 0 (and any other synced VLANs). When the slave device is destroyed, its vlan_info / vlan_vid_info structure remains allocated, leading to a memory leak. Fix this by calling vlan_vids_del_by_dev(port->dev, master->dev) in hsr_del_port() before unlinking slave A or slave B ports, matching the propagation logic in hsr_ndo_vlan_rx_add_vid() / hsr_ndo_vlan_rx_kill_vid() and the cleanup behavior in bonding and team drivers.

Timeline

1. Aug 10, 2026, 12:02 PM UTCCVE published
2. Aug 19, 2026, 4:32 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 5.15.194 · fixed in 5.15.216; From 6.1.153 · fixed in 6.1.183; From 6.6.107 · fixed in 6.6.148; From 6.12.48 · fixed in 6.12.101

• Linux Linux

  6.13

References 7