{"id":"CVE-2026-72310","summary":"smb: client: fix overflow in passthrough ioctl bounds check","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix overflow in passthrough ioctl bounds check\n\nsmb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload\nbefore copying it to userspace.\n\nThe payload offset and length both come from 32-bit fields. The bounds\ncheck currently adds OutputOffset and qi.input_buffer_length directly, so\nthe addition can wrap in 32-bit arithmetic before the result is compared\nagainst the response buffer length.\n\nA malicious server can use a large OutputOffset and a small OutputCount\nto make the wrapped sum pass the bounds check. The later copy_to_user()\nthen reads from io_rsp + OutputOffset, outside the response buffer.\n\nUse size_add() for the offset plus length check so overflow is treated as\nout of bounds.","modified":"2026-10-17T10:30:57.127276151Z","published":"2026-08-15T05:55:26.539Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72310.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/160045fc943f6c46b227644261252c8a22b8a87a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1627e7d5c9b09721a141d07cedb178882f1ded67"},{"type":"WEB","url":"https://git.kernel.org/stable/c/175357ee0c596cb82054650dfa32fda51ad35aaa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"},{"type":"WEB","url":"https://git.kernel.org/stable/c/63feb687e89a3a52a31e6e01764117cc500f1974"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a4f27ad055392fa164f5649e89a3637b033c5fcc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b30771b69eafae750afb7385fbcc3d77ed3f3670"},{"type":"WEB","url":"https://git.kernel.org/stable/c/dbd126539c098dba3159ce7d34b10b2daddcbd0f"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72310.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72310"},{"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":"2b1116bbe898aefdf584838448c6869f69851e0f"},{"fixed":"175357ee0c596cb82054650dfa32fda51ad35aaa"},{"fixed":"dbd126539c098dba3159ce7d34b10b2daddcbd0f"},{"fixed":"63feb687e89a3a52a31e6e01764117cc500f1974"},{"fixed":"160045fc943f6c46b227644261252c8a22b8a87a"},{"fixed":"b30771b69eafae750afb7385fbcc3d77ed3f3670"},{"fixed":"1627e7d5c9b09721a141d07cedb178882f1ded67"},{"fixed":"1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9"},{"fixed":"a4f27ad055392fa164f5649e89a3637b033c5fcc"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.4.69"},{"fixed":"5.5"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"2005c32ec99ee2490e8131b3953f3f212009ffea"}]}],"versions":["v5.4.302","v5.4.301","v5.4.300","v5.4.299","v5.4.298","v5.4.297","v5.4.296","v5.4.295","v5.4.294","v5.4.293","v5.4.292","v5.4.291","v5.4.290","v5.4.289","v5.4.288","v5.4.287","v5.4.286","v5.4.285","v5.4.284","v5.4.283","v5.4.282","v5.4.281","v5.4.280","v5.4.279","v5.4.278","v5.4.277","v5.4.276","v5.4.275","v5.4.274","v5.4.273","v5.4.272","v5.4.271","v5.4.270","v5.4.269","v5.4.268","v5.4.267","v5.4.266","v5.4.265","v5.4.264","v5.4.263","v5.4.262","v5.4.261","v5.4.260","v5.4.259","v5.4.258","v5.4.257","v5.4.256","v5.4.255","v5.4.254","v5.4.253","v5.4.252","v5.4.251","v5.4.250","v5.4.249","v5.4.248","v5.4.247","v5.4.246","v5.4.245","v5.4.244","v5.4.243","v5.4.242","v5.4.241","v5.4.240","v5.4.239","v5.4.238","v5.4.237","v5.4.236","v5.4.235","v5.4.234","v5.4.233","v5.4.232","v5.4.231","v5.4.230","v5.4.229","v5.4.228","v5.4.227","v5.4.226","v5.4.225","v5.4.224","v5.4.223","v5.4.222","v5.4.221","v5.4.220","v5.4.219","v5.4.218","v5.4.217","v5.4.216","v5.4.215","v5.4.214","v5.4.213","v5.4.212","v5.4.211","v5.4.210","v5.4.209","v5.4.208","v5.4.207","v5.4.206","v5.4.205","v5.4.204","v5.4.203","v5.4.202","v5.4.201","v5.4.200","v5.4.199","v5.4.198","v5.4.197","v5.4.196","v5.4.195","v5.4.194","v5.4.193","v5.4.192","v5.4.191","v5.4.190","v5.4.189","v5.4.188","v5.4.187","v5.4.186","v5.4.185","v5.4.184","v5.4.183","v5.4.182","v5.4.181","v5.4.180","v5.4.179","v5.4.178","v5.4.177","v5.4.176","v5.4.175","v5.4.174","v5.4.173","v5.4.172","v5.4.171","v5.4.170","v5.4.169","v5.4.168","v5.4.167","v5.4.166","v5.4.165","v5.4.164","v5.4.163","v5.4.162","v5.4.161","v5.4.160","v5.4.159","v5.4.158","v5.4.157","v5.4.156","v5.4.155","v5.4.154","v5.4.153","v5.4.152","v5.4.151","v5.4.150","v5.4.149","v5.4.148","v5.4.147","v5.4.146","v5.4.145","v5.4.144","v5.4.143","v5.4.142","v5.4.141","v5.4.140","v5.4.139","v5.4.138","v5.4.137","v5.4.136","v5.4.135","v5.4.134","v5.4.133","v5.4.132","v5.4.131","v5.4.130","v5.4.129","v5.4.128","v5.4.127","v5.4.126","v5.4.125","v5.4.124","v5.4.123","v5.4.122","v5.4.121","v5.4.120","v5.4.119","v5.4.118","v5.4.117","v5.4.116","v5.4.115","v5.4.114","v5.4.113","v5.4.112","v5.4.111","v5.4.110","v5.4.109","v5.4.108","v5.4.107","v5.4.106","v5.4.105","v5.4.104","v5.4.103","v5.4.102","v5.4.101","v5.4.100","v5.4.99","v5.4.98","v5.4.97","v5.4.96","v5.4.95","v5.4.94","v5.4.93","v5.4.92","v5.4.91","v5.4.90","v5.4.89","v5.4.88","v5.4.87","v5.4.86","v5.4.85","v5.4.84","v5.4.83","v5.4.82","v5.4.81","v5.4.80","v5.4.79","v5.4.78","v5.4.77","v5.4.76","v5.4.75","v5.4.74","v5.4.73","v5.4.72","v5.4.71","v5.4.70","v5.4.69"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72310.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"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