CVE-2026-68301: In the Linux kernel, the following vulnerability has been resolved: net: hsr: fix memory leak on slave unregistration by removing synced VLANs When ...

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= 72dbae1f2f2159395089405c6c54632f2613f1be, < f72c312af6c7897ab0f8a2b5a63f917a207a4143; >= c707d2c5541d2bb94131968ad5dfeb06427a1dba, < 21d48408479a17eb65568a765930adea37e4d804; >= 1a8a63a5305e95519de6f941922dfcd8179f82e5, < b5ded444621b6180df9f3d4e07045fc1fc1e8cd9; >= 1a8a63a5305e95519de6f941922dfcd8179f82e5, < ae995b8002d3af134560a706c0e111a89e26317c; >= 1a8a63a5305e95519de6f941922dfcd8179f82e5, < dcf15eaf5641812f1cfc5e96537380132a7da89d; 1100242709d5644856131a9dd25d32672ebe7357; a2accc07bdcfb0c7ab2cacdca6a1fe8267816efa; >= 6.6.107, < 6.6.148; >= 6.12.48, < 6.12.101; >= 5.15.194, < 5.16; >= 6.1.153, < 6.2
Linux	Linux	6.13

References

Timeline

Published: Aug 10, 2026
Last Modified: Aug 10, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-68301?

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.

How severe is CVE-2026-68301?

Severity scoring for CVE-2026-68301 is pending analysis.

How do I fix CVE-2026-68301?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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