CVE-2026-63835 – batman-adv: v: prevent OGM aggregation on disabled hardif

CVE ID :CVE-2026-63835

Published : July 19, 2026, 12:16 p.m. | 1 hour, 23 minutes ago

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.

Severity: 0.0 | NA

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