CVE-2026-52934 - batman-adv: tvlv: reject oversized TVLV packets

CVE-2026-52934 - batman-adv: tvlv: reject oversized TVLV packets

https://cvefeed.io/rssfeed/latest.atom / Wed, 06/24/2026 - 13:01
CVE ID :CVE-2026-52934
Published : June 24, 2026, 7:14 a.m. | 2 hours, 26 minutes ago
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.
Severity: 0.0 | NA
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