{"id":"CVE-2026-64088","summary":"batman-adv: tt: fix negative tt_buff_len","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: fix negative tt_buff_len\n\nbatadv_orig_node::tt_buff_len was declared as s16, but the field is never\nintended to hold a negative value. When a value greater than 32767 is\nassigned, it wraps to a negative signed integer.\n\nIn batadv_send_other_tt_response(), tt_buff_len is temporarily widened to\ns32. The incorrectly negative s16 value propagates into the s32, causing\nbatadv_tt_prepare_tvlv_global_data() to allocate a full sized buffer but\npopulates only a small portion of it with the collected changeset. All\nremaining bits are kept uninitialized.\n\nUsing an u16 avoids this type confusion and ensures that no (negative) sign\nextension is performed in batadv_send_other_tt_response().","modified":"2026-07-22T03:31:49.161639499Z","published":"2026-07-19T15:39:58.084Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64088.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/32edd2a28e112064020a2f319a8cb8a9e5a09767"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c96dff00998314983b68a3e7caac07a66ebe496"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4dab98961426d0cf6a1599cda6950b7596ca2fcd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/730de8733dd90f70d7580a9b329b971f8e1474a2"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b64963a2ceeb7529310b6cf253a1e540784422f4"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ed28ead3420c373a7928622f114bc6168075d1e1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64088.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-64088"},{"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":"a73105b8d4c765d9ebfb664d0a66802127d8e4c7"},{"fixed":"4c4c2f340f4c27373bfcac8dc5032ce7bb474e47"},{"fixed":"33e5ede7ce6d92e531920d4bbd6d3e18ef1c6430"},{"fixed":"3c96dff00998314983b68a3e7caac07a66ebe496"},{"fixed":"32edd2a28e112064020a2f319a8cb8a9e5a09767"},{"fixed":"4dab98961426d0cf6a1599cda6950b7596ca2fcd"},{"fixed":"730de8733dd90f70d7580a9b329b971f8e1474a2"},{"fixed":"ed28ead3420c373a7928622f114bc6168075d1e1"},{"fixed":"b64963a2ceeb7529310b6cf253a1e540784422f4"}]}],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-64088.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"3.1.0"},{"fixed":"5.10.258"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.209"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.175"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.142"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.92"}]},{"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/osv-test-cve-osv-conversion/osv-output/CVE-2026-64088.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"}]}