What’s Vulnerable › Vulnerabilities

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

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-08-17

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.

Affected products

• Linux kernel: 5.4 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3d4548c96d6f21ac1a9b06c5f82f3ef439c87023
• https://git.kernel.org/stable/c/86ab6b6fb5b82163bf6c45780bb72150021d7349
• https://git.kernel.org/stable/c/97644fdaaf6446ffbe182c5eb804fceb5b1a51b7
• https://git.kernel.org/stable/c/d11c00b95b2a3b3934007fc003dccc6fdcc061ad
• https://git.kernel.org/stable/c/d3569327fc7395b2b0461a0a0cb77a0bb74786c0
• https://git.kernel.org/stable/c/d462ced79dd430200cf888984e8005da77fc810b
• https://git.kernel.org/stable/c/f04dde74399431fb07abbdd9cd5d0ed624771d04
• https://git.kernel.org/stable/c/f79deaaf822ab0ee2424cf28781f9ab91576bea3

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