CVE-2026-93204

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

batman-adv: dat: atomically update mac addresses

When a MAC address is updated in batadv_dat_entry_add(), it is done using a

simple copy function. A parallel reader might only see parts of this

update. In worst case, the reader is transporting the half updated MAC

address over the network or is creating an ARP response using it -

poisoning the ARP cache.

atomic64_t can be used to store the 48 bit of a mac address. A reader will

then either see the old mac address or the new one - never a mixture of

both.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References