{"id":"CVE-2026-31659","summary":"batman-adv: reject oversized global TT response buffers","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: reject oversized global TT response buffers\n\nbatadv_tt_prepare_tvlv_global_data() builds the allocation length for a\nglobal TT response in 16-bit temporaries. When a remote originator\nadvertises a large enough global TT, the TT payload length plus the VLAN\nheader offset can exceed 65535 and wrap before kmalloc().\n\nThe full-table response path still uses the original TT payload length when\nit fills tt_change, so the wrapped allocation is too small and\nbatadv_tt_prepare_tvlv_global_data() writes past the end of the heap object\nbefore the later packet-size check runs.\n\nFix this by rejecting TT responses whose TVLV value length cannot fit in\nthe 16-bit TVLV payload length field.","modified":"2026-06-18T03:56:51.947993606Z","published":"2026-04-24T14:45:10.254Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31659.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897"},{"type":"WEB","url":"https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31659.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31659"},{"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":"7ea7b4a142758deaf46c1af0ca9ceca6dd55138b"},{"fixed":"7e5d007e0df946bffb8542fb112e0044014a5897"},{"fixed":"2997f4bd1f982e7013709946e00be89b507693fa"},{"fixed":"95c71365a2222908441b54d6f2c315e0c79fcec3"},{"fixed":"69d61639bc7e963c3b645e570279d731e7c89062"},{"fixed":"f970646b9a39539d1bac86822ac78b5915455ea9"},{"fixed":"de6c1dc3c7d01a152607e6fcecee4d5288283f10"},{"fixed":"cf2199171ef799ca7270019125f4a91bd20ad4d9"},{"fixed":"3a359bf5c61d52e7f09754108309d637532164a6"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31659.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.13.0"},{"fixed":"5.10.253"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.203"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.169"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.135"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.82"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.23"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"6.19.13"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-31659.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}