CVE-2026-52934

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> batman-adv: tvlv: reject oversized TVLV packets<br /> <br /> batadv_tvlv_container_ogm_append() builds a TVLV packet section from<br /> the tvlv.container_list. The total size of this section is computed by<br /> batadv_tvlv_container_list_size(), which sums the sizes of all registered<br /> containers.<br /> <br /> The return type and accumulator in batadv_tvlv_container_list_size() were<br /> u16. If the accumulated size exceeds U16_MAX, the value wraps around,<br /> causing the subsequent allocation in batadv_tvlv_container_ogm_append()<br /> to be undersized. The memcpy-style copy that follows would then write<br /> beyond the end of the allocated buffer, corrupting kernel memory.<br /> <br /> Fix this by widening the return type of batadv_tvlv_container_list_size()<br /> to size_t. In batadv_tvlv_container_ogm_append(), check the computed length<br /> against U16_MAX before proceeding, and bail out as if the allocation had<br /> failed when the limit is exceeded.