CVE-2026-63835

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: v: prevent OGM aggregation on disabled hardif

When an interface gets disabled, the worker is correctly disabled by

batadv_hardif_disable_interface() -> ... -> batadv_v_ogm_iface_disable().

In this process, the skb aggr_list is also freed.

But batadv_v_ogm_send_meshif() can still queue new skbs (via

batadv_v_ogm_queue_on_if()) to the aggr_list. This will only stop after all

cores can no longer find the RCU protected list of hard interfaces. These

queued skbs will never be freed or consumed by batadv_v_ogm_aggr_work.

The batadv_v_ogm_iface_disable() function must block

batadv_v_ogm_queue_on_if() to avoid leak of skbs.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References