CVE-2026-68301net: hsr: fix memory leak on slave unregistration by removing synced VLANs

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/ccc822e9e4f09a6c2ca73ad5334570441947f94f
• https://git.kernel.org/stable/c/79ff0547676acdeceda445c3fce4071b0a887b70
• https://git.kernel.org/stable/c/f72c312af6c7897ab0f8a2b5a63f917a207a4143
• https://git.kernel.org/stable/c/21d48408479a17eb65568a765930adea37e4d804
• https://git.kernel.org/stable/c/b5ded444621b6180df9f3d4e07045fc1fc1e8cd9
• https://git.kernel.org/stable/c/ae995b8002d3af134560a706c0e111a89e26317c
• https://git.kernel.org/stable/c/dcf15eaf5641812f1cfc5e96537380132a7da89d