{"id":"CVE-2026-90082","summary":"net: mana: Cap MSI-X vectors to the device MSI-X table size","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: mana: Cap MSI-X vectors to the device MSI-X table size\n\nmana_gd_query_max_resources() sizes gc-\u003enum_msix_usable from resp.max_msix\nand the CPU count, but never from the device MSI-X table. On a 1792 vCPU\nM-series VM that yields 1793 while the table has 1024 entries, and\nmana_gd_setup_remaining_irqs() then walks indices 1..1792, running off the\nend of the region mapped by msix_map_region():\n\n  BUG: unable to handle page fault for address: ff8e347f8b99800c\n  RIP: 0010:msix_prepare_msi_desc+0x7a/0x90\n  RAX: 0000000000004000 RBX: ff4330cb164ea780 RCX: ff8e347f8b998000\n  Call Trace:\n   \u003cTASK\u003e\n   __msi_domain_alloc_irqs+0x13a/0x440\n   msi_domain_alloc_irq_at+0x149/0x1b0\n   mana_gd_setup+0x351/0x890\n   mana_gd_probe+0x274/0x390\n   \u003c/TASK\u003e\n\nRAX is index 1024 * PCI_MSIX_ENTRY_SIZE, one entry past the table.\n\nmsi_insert_desc() does range check the index, but only against the MSI\ndomain hwsize, which matches the table only for devices on an MSI parent\ndomain. With a global PCI/MSI domain hwsize is MSI_XA_DOMAIN_SIZE, so\nnothing bounds the request.\n\nCap num_msix_usable with pci_msix_vec_count().","modified":"2026-09-19T03:47:23.846825556Z","published":"2026-09-17T16:05:59.532Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90082.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2c7493f980140a5c40eb4f98f97c557193a2c330"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4f9827b314ee57cd99f86f8dbadcaf567112e2b2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90082.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-90082"},{"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":"755391121038c06cb653241aa94dcabd87179f62"},{"fixed":"4f9827b314ee57cd99f86f8dbadcaf567112e2b2"},{"fixed":"2c7493f980140a5c40eb4f98f97c557193a2c330"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90082.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"7.2.6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-90082.json"}}],"schema_version":"1.9.0"}