CVE-2026-46208: batman-adv: stop tp_meter sessions during mesh teardown

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-28 · updated 2026-06-19

Description

In the Linux kernel, the following vulnerability has been resolved: batman-adv: stop tp_meter sessions during mesh teardown TP meter sessions remain linked on bat_priv->tp_list after the netlink request has already finished. When the mesh interface is removed, batadv_mesh_free() currently tears down the mesh without first draining these sessions. A running sender thread or a late incoming tp_meter packet can then keep processing against a mesh instance which is already shutting down. Synchronize tp_meter with the mesh lifetime by stopping all active sessions from batadv_mesh_free() and waiting for sender threads to exit before teardown continues.

Affected products

Linux kernel: from 4.8 before 6.6.140; from 6.7 before 6.12.90; from 6.13 before 6.18.32; from 6.19 before 7.0.9; 7.1-rc1, 7.1-rc2, 7.1-rc3 — fixed in 6.12.90, 6.18.32, 6.6.140, 7.0.9

How to fix

Upgrade to a fixed version: Linux kernel 6.12.90, 6.18.32, 6.6.140, 7.0.9. Check the vendor advisory for mitigations.

References

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