CVE-2026-63835 Details
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.
A vulnerability exists in the Linux kernel's batman-adv module, specifically related to the handling of OGM (Optimized Geometric Mesh) packet aggregation on disabled hard interfaces. When a hard interface is disabled, the corresponding aggregation list is freed. However, the function responsible for sending OGM packets can still enqueue new packets to the aggregation list. This queuing continues until the RCU-protected list of hard interfaces is no longer accessible, leading to a situation where the queued packets are neither processed nor freed, causing a memory leak. The issue arises because the interface disable function does not properly block the queuing of OGM packets, allowing for a buildup of unhandled data.
The batman-adv OGM interface disable function should be modified to properly block the queuing of OGM packets, preventing them from being added to the aggregation list when the interface is disabled.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No CVSS 3.x data is available for this CVE.
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
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Weakness Enumeration
No weakness enumeration is available for this CVE.
Affected Products
No affected product data is available for this CVE.
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Aug 17, 2026 | CVE Modified | kernel.org |
| Jul 19, 2026 | New CVE Received | kernel.org |