CVE-2026-53013 | Linux Kernel up to 6.6.140/6.12.90/6.18.32/7.0.9 macvlan macvlan_get_size bc_cutoff privilege escalation (WID-SEC-2026-2077)

A vulnerability categorized as critical has been discovered in Linux Kernel up to 6.6.140/6.12.90/6.18.32/7.0.9. Affected by this issue is the function macvlan_get_size of the component macvlan. The manipulation of the argument bc_cutoff results in privilege escalation. This vulnerability is cataloged as CVE-2026-53013. The attack must originate from the local network. There is no exploit available. It is advisable to upgrade the affected component.