{"id":"AZL-83870","summary":"CVE-2026-31659 affecting package kernel for versions less than 6.6.137.1-1","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":"2026-08-28T17:48:03.518050058Z","published":"2026-04-24T15:16:45Z","upstream":["CVE-2026-31659"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-31659"}],"affected":[{"package":{"name":"kernel","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/kernel"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.6.137.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-83870.json"}}],"schema_version":"1.9.0"}