CVE-2026-52913
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk7th percentile — higher than 7% of all known CVEs
Summary
In the Linux kernel's batman-adv module, a NULL pointer dereference vulnerability exists. When a network interface is disabled, its mesh_iface pointer is set to NULL, but batadv_v_ogm_send_meshif() may still dispatch OGMv2 packets through the disabled interface, causing a crash when trying to read from address NULL.
Risk Assessment
An attacker could deliberately trigger the disabling of a network interface at the right moment, causing a kernel panic and disrupting services on the server or network device.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit addressing the issue). If an update is not possible, temporarily disable the batman-adv module or avoid using OGMv2 on interfaces subject to dynamic disabling.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: batman-adv: v: stop OGMv2 on disabled interface When a batadv_hard_iface is disabled, its mesh_iface pointer is set to NULL. However, batadv_v_ogm_send_meshif() may still dispatch OGMs via batadv_v_ogm_queue_on_if() for interfaces that have since lost their mesh_iface association. This results in a NULL pointer dereference when batadv_v_ogm_queue_on_if() unconditionally calls netdev_priv() on the now NULL hard_iface->mesh_iface to retrieve the batadv_priv. It is necessary to ensure that the batadv_v_ogm_queue_on_if() checks that it is using the same mesh_iface for which batadv_v_ogm_send_meshif() was called.