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

Severity: unknown
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-10 · updated 2026-08-19

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 products

Linux kernel: from 5.15.194 before 5.15.216; from 6.1.153 before 6.1.183; from 6.6.107 before 6.6.148; from 6.12.48 before 6.12.101; 6.13 — fixed in 5.15.216, 6.1.183, 6.12.101, 6.6.148, 7.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.216, 6.1.183, 6.12.101, 6.6.148. Check the vendor advisory for mitigations.

References

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