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CVE-2025-38470 is a reference-counting vulnerability in the Linux kernel's 8021q VLAN subsystem. The subsystem automatically adds VLAN 0 when a network device with rx-vlan-filter enabled is brought administratively up and removes it when the device is brought down. Changing the filtering state while the device is running causes this accounting to become inconsistent. Disabling filtering can prevent removal of an automatically added VLAN 0 reference, leaking memory. Conversely, enabling filtering after bringing a device up without filtering can cause shutdown to remove a reference that was never automatically added. With an explicitly configured VLAN 0 interface, this can prematurely free VLAN information and trigger a null-pointer dereference or BUG_ON assertion in unregister_vlan_dev().
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A Linux kernel VLAN reference-counting flaw occurs when receive VLAN filtering is toggled while a network device is running. Incorrect tracking of automatically added VLAN 0 entries can cause memory leaks or a null-pointer dereference/kernel BUG during VLAN removal, affecting availability. The advisory assigns CVSS v3 severity 5.5, with local access and low privileges required.
Linux kernel VLAN vulnerability involving a VLAN 0 reference count imbalance when toggling filtering at runtime.
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Cross-references every affected SKU, including bundled OEM variants.
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