{"id":"CVE-2026-52934","summary":"batman-adv: tvlv: reject oversized TVLV packets","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tvlv: reject oversized TVLV packets\n\nbatadv_tvlv_container_ogm_append() builds a TVLV packet section from\nthe tvlv.container_list. The total size of this section is computed by\nbatadv_tvlv_container_list_size(), which sums the sizes of all registered\ncontainers.\n\nThe return type and accumulator in batadv_tvlv_container_list_size() were\nu16. If the accumulated size exceeds U16_MAX, the value wraps around,\ncausing the subsequent allocation in batadv_tvlv_container_ogm_append()\nto be undersized. The memcpy-style copy that follows would then write\nbeyond the end of the allocated buffer, corrupting kernel memory.\n\nFix this by widening the return type of batadv_tvlv_container_list_size()\nto size_t. In batadv_tvlv_container_ogm_append(), check the computed length\nagainst U16_MAX before proceeding, and bail out as if the allocation had\nfailed when the limit is exceeded.","modified":"2026-07-10T03:54:50.220802902Z","published":"2026-06-24T07:14:25.321Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52934.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/13493b00dd1e05a705981e052158652ea23eb482"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1595628a2f877d052eda18865ccf539392c47c04"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6448a49344e87487b61bd88cb850cd694a0f576d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94a3d72cd9b21116d7c6d5bdc57c11401fc28557"},{"type":"WEB","url":"https://git.kernel.org/stable/c/94db72e9dac202e017ee3db22c59d17e4f3bf171"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c02aa6c0c9d1bea9bb75dea362b75ad225137bae"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ede47988ac5687793745b17c1634a496a2299919"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f50487e3566358b2b982b7801945e858c78ad9ab"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52934.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-52934"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ef26157747d42254453f6b3ac2bd8bd3c53339c3"},{"fixed":"c02aa6c0c9d1bea9bb75dea362b75ad225137bae"},{"fixed":"1595628a2f877d052eda18865ccf539392c47c04"},{"fixed":"6448a49344e87487b61bd88cb850cd694a0f576d"},{"fixed":"13493b00dd1e05a705981e052158652ea23eb482"},{"fixed":"94db72e9dac202e017ee3db22c59d17e4f3bf171"},{"fixed":"ede47988ac5687793745b17c1634a496a2299919"},{"fixed":"94a3d72cd9b21116d7c6d5bdc57c11401fc28557"},{"fixed":"f50487e3566358b2b982b7801945e858c78ad9ab"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52934.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.13.0"},{"fixed":"5.10.259"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.210"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.176"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.143"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.93"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.34"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.0.11"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52934.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}