{"id":"CVE-2026-74470","summary":"scsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_debug: Fix REPORT ZONES alloc_len underflow OOB write\n\nresp_report_zones() sizes the reply buffer from the CDB allocation\nlength. The v3 fix rounds alloc_len up with ALIGN() before deriving the\ndescriptor count:\n\n\trep_max_zones = (ALIGN((u64)alloc_len, RZONES_DESC_HD) -\n\t\t\t RZONES_DESC_HD) \u003e\u003e ilog2(RZONES_DESC_HD);\n\tarr_len = (u64)RZONES_DESC_HD * (rep_max_zones + 1);\n\nFor alloc_len in 0xFFFFFFC1..0xFFFFFFFF, ALIGN() rounds up to\n0x100000000, so arr_len is 4 GB. On 32-bit, kzalloc()'s size_t is 32-bit\nand truncates 0x100000000 to 0; kzalloc(0) returns ZERO_SIZE_PTR, which\npasses the !arr check, and desc = arr + 64 is then dereferenced in the\nloop -\u003e out-of-bounds write / panic.\n\nClamp rep_max_zones to devip-\u003enr_zones. The loop already stops at\nsdebug_capacity (after nr_zones zones), so a report can never hold more\nthan nr_zones descriptors; the clamp does not change the report, it only\nbounds arr_len to (nr_zones + 1) * RZONES_DESC_HD, a real device\nproperty that can never reach 0x100000000.","modified":"2026-10-28T02:30:43.387354712Z","published":"2026-08-15T12:27:07.504Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74470.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2047ed09bf13453b7d6f9431b112ec07984dd69b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/495058429ca55ab7fcc21977b63b92907ad68066"},{"type":"WEB","url":"https://git.kernel.org/stable/c/49e5b25a0b74dbac595f122e5608fdce2918cc4e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5d3e1d006bbb543259f9e31824caadbfff6a5465"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7b615fc139e35c81077046df44725c532f7e2404"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93dde0bf2f39a0f9f57fd610aa3201ce5b753433"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d6e6da6bc3b53231fac77ffab428da8173ee729c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74470.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74470"},{"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":"ebacb44cb2042b90951140eda806bedad23ef554"},{"fixed":"7b615fc139e35c81077046df44725c532f7e2404"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"7db0e0c8190a086ef92ce5bb960836cde49540aa"},{"fixed":"5d3e1d006bbb543259f9e31824caadbfff6a5465"},{"fixed":"49e5b25a0b74dbac595f122e5608fdce2918cc4e"},{"fixed":"495058429ca55ab7fcc21977b63b92907ad68066"},{"fixed":"2047ed09bf13453b7d6f9431b112ec07984dd69b"},{"fixed":"d6e6da6bc3b53231fac77ffab428da8173ee729c"},{"fixed":"93dde0bf2f39a0f9f57fd610aa3201ce5b753433"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.15.8"},{"fixed":"5.15.217"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"5.10.85"},{"fixed":"5.11"}]},{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"c4d2d7c935a4ad20e8e726ca10499cefe4537103"}]}],"versions":["v5.15.216","v5.15.215","v5.15.214","v5.15.213","v5.15.212","v5.15.211","v5.15.210","v5.15.209","v5.15.208","v5.15.207","v5.15.206","v5.15.205","v5.15.204","v5.15.203","v5.15.202","v5.15.201","v5.15.200","v5.15.199","v5.15.198","v5.15.197","v5.15.196","v5.15.195","v5.15.194","v5.15.193","v5.15.192","v5.15.191","v5.15.190","v5.15.189","v5.15.188","v5.15.187","v5.15.186","v5.15.185","v5.15.184","v5.15.183","v5.15.182","v5.15.181","v5.15.180","v5.15.179","v5.15.178","v5.15.177","v5.15.176","v5.15.175","v5.15.174","v5.15.173","v5.15.172","v5.15.171","v5.15.170","v5.15.169","v5.15.168","v5.15.167","v5.15.166","v5.15.165","v5.15.164","v5.15.163","v5.15.162","v5.15.161","v5.15.160","v5.15.159","v5.15.158","v5.15.157","v5.15.156","v5.15.155","v5.15.154","v5.15.153","v5.15.152","v5.15.151","v5.15.150","v5.15.149","v5.15.148","v5.15.147","v5.15.146","v5.15.145","v5.15.144","v5.15.143","v5.15.142","v5.15.141","v5.15.140","v5.15.139","v5.15.138","v5.15.137","v5.15.136","v5.15.135","v5.15.134","v5.15.133","v5.15.132","v5.15.131","v5.15.130","v5.15.129","v5.15.128","v5.15.127","v5.15.126","v5.15.125","v5.15.124","v5.15.123","v5.15.122","v5.15.121","v5.15.120","v5.15.119","v5.15.118","v5.15.117","v5.15.116","v5.15.115","v5.15.114","v5.15.113","v5.15.112","v5.15.111","v5.15.110","v5.15.109","v5.15.108","v5.15.107","v5.15.106","v5.15.105","v5.15.104","v5.15.103","v5.15.102","v5.15.101","v5.15.100","v5.15.99","v5.15.98","v5.15.97","v5.15.96","v5.15.95","v5.15.94","v5.15.93","v5.15.92","v5.15.91","v5.15.90","v5.15.89","v5.15.88","v5.15.87","v5.15.86","v5.15.85","v5.15.84","v5.15.83","v5.15.82","v5.15.81","v5.15.80","v5.15.79","v5.15.78","v5.15.77","v5.15.76","v5.15.75","v5.15.74","v5.15.73","v5.15.72","v5.15.71","v5.15.70","v5.15.69","v5.15.68","v5.15.67","v5.15.66","v5.15.65","v5.15.64","v5.15.63","v5.15.62","v5.15.61","v5.15.60","v5.15.59","v5.15.58","v5.15.57","v5.15.56","v5.15.55","v5.15.54","v5.15.53","v5.15.52","v5.15.51","v5.15.50","v5.15.49","v5.15.48","v5.15.47","v5.15.46","v5.15.45","v5.15.44","v5.15.43","v5.15.42","v5.15.41","v5.15.40","v5.15.39","v5.15.38","v5.15.37","v5.15.36","v5.15.35","v5.15.34","v5.15.33","v5.15.32","v5.15.31","v5.15.30","v5.15.29","v5.15.28","v5.15.27","v5.15.26","v5.15.25","v5.15.24","v5.15.23","v5.15.22","v5.15.21","v5.15.20","v5.15.19","v5.15.18","v5.15.17","v5.15.16","v5.15.15","v5.15.14","v5.15.13","v5.15.12","v5.15.11","v5.15.10","v5.15.9","v5.15.8","v5.10.272","v5.10.271","v5.10.270","v5.10.269","v5.10.268","v5.10.267","v5.10.266","v5.10.265","v5.10.264","v5.10.263","v5.10.262","v5.10.261","v5.10.260","v5.10.259","v5.10.258","v5.10.257","v5.10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