CVE-2026-52934

/// Technical description

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

batman-adv: tvlv: reject oversized TVLV packets

batadv_tvlv_container_ogm_append() builds a TVLV packet section from

the tvlv.container_list. The total size of this section is computed by

batadv_tvlv_container_list_size(), which sums the sizes of all registered

containers.

The return type and accumulator in batadv_tvlv_container_list_size() were

u16. If the accumulated size exceeds U16_MAX, the value wraps around,

causing the subsequent allocation in batadv_tvlv_container_ogm_append()

to be undersized. The memcpy-style copy that follows would then write

beyond the end of the allocated buffer, corrupting kernel memory.

Fix this by widening the return type of batadv_tvlv_container_list_size()

to size_t. In batadv_tvlv_container_ogm_append(), check the computed length

against U16_MAX before proceeding, and bail out as if the allocation had

failed when the limit is exceeded.

/// 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