net: hsr: fix memory leak on slave unregistration by removing synced VLANs
Key facts
- Attack vector
- —
- Privileges required
- —
- User interaction
- —
- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
- —
- Fix status
- Partial Red Hat: 2 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Linux | Linux | 5.15.194 to before 5.15.216; 6.1.153 to before 6.1.183; 6.6.107 to before 6.6.148; 6.12.48 to before 6.12.101 | 5.15.216, 6.1.183, 6.6.148, 6.12.101 | Patch available | CNA |
| Linux | Linux | 6.13 and later | 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 | Patch available | CNA |
- Linux VendorLinux Affected 5.15.194 to before 5.15.216; 6.1.153 to before 6.1.183; 6.6.107 to before 6.6.148; 6.12.48 to before 6.12.101 Fixed in 5.15.216, 6.1.183, 6.6.148, 6.12.101 Patch available CNA
- Linux VendorLinux Affected 6.13 and later Fixed in 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2 Patch available CNA
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.15.216, 6.1.183, 6.6.148, 6.12.101
- Fix · CNA Linux (Linux) Fixed in 5.15.216, 6.1.183, 6.6.148, 6.12.101, 6.18.42, 7.1.6, 7.2
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
Not affected: 4 products
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
Timeline
- 2026-10-02 Threatist record created from CVE-2026-68301
- 2026-10-03 Alias added: GHSA-f9h5-hhgx-wh5m
- 2026-10-29 Affected versions changed · Red Hat
- 2026-11-06 CISA SSVC decision points changed
References
Other 7
- 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
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Sources
- CVE-2026-68301 · CVE Program
- CVE-2026-68301 · NVD
- FIRST EPSS
- GHSA-f9h5-hhgx-wh5m · GitHub Advisory Database · CC BY 4.0
- CVE-2026-68301 · Red Hat security data · CC BY 4.0
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