{"id":"CVE-2026-89856","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-89856","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation\n\nha->msix_count is u16, but ha->max_req_queues,…","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation\n\nha->msix_count is u16, but ha->max_req_queues, ha->max_rsp_queues and\nha->max_qpairs are u8. Deriving the queue count as\n\"ha->max_req_queues = ha->msix_count - 1\" therefore truncates: a board\n(or a misconfigured/malicious hot-plugged device) advertising 257 MSI-X\nvectors yields msix_count - 1 == 256, which truncates to 0. An MSI-X\ncount of 1 zeroes it as well, and in target mode the subsequent\n\"ha->max_req_queues--\" then underflows 0 to 255.\n\nWhen the count is 0, qla2x00_alloc_queues() calls\nkzalloc_objs(struct req_que *, 0), which returns ZERO_SIZE_PTR. That is\nnot NULL, so the allocation check passes and the following\n\"ha->req_q_map[0] = req\" dereferences ZERO_SIZE_PTR, corrupting memory\nor crashing the kernel.\n\nAdd qla_calc_queue_count() to clamp the derived value into\n[1, QLA_MAX_QUEUES - 1] so it always fits in u8 and is never zero, and\nuse it at all three derivation sites (qla25xx_iospace_config(),\nqla83xx_iospace_config() and qla24xx_enable_msix()). Also guard the\ntarget-mode decrement so it cannot reintroduce a zero (which would in\nturn underflow max_qpairs).","published":"2026-09-16T11:16:53.440","modified":"2026-09-16T11:16:53.440","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-16T11:16:53.440"}}