{"id":"CVE-2026-89856","title":"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","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, ha->max_rsp_queues and\nha->max_qpairs are u8. Derivi…","severity":"high","cvss":8.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= d74595278f4ab192af66d9e60a9087464638beee < cf623d32761b00f221a9cfded3303d56e84b429d","Linux >= d74595278f4ab192af66d9e60a9087464638beee < 9eeddbeaa896f39d943644b16d83a6ad0ceab255","Linux >= d74595278f4ab192af66d9e60a9087464638beee < 802068b9b683b8008fcccbf6e9ad133e597ec87c","Linux >= d74595278f4ab192af66d9e60a9087464638beee < e80adfeac61b4d5db7ffe0f5af43999c33a4145e","Linux >= d74595278f4ab192af66d9e60a9087464638beee < 2efe50b2da829909023de4a2eb87badb7cfa53cc","Linux >= d74595278f4ab192af66d9e60a9087464638beee < 7a448f5ed0b283dbde4e9183dd1e98c221432dab","Linux >= d74595278f4ab192af66d9e60a9087464638beee < 33c77254e6e91f37c72c7fad4051777452b10de8","Linux >= d74595278f4ab192af66d9e60a9087464638beee < ebfd35c64433821bd5619a6d07ccc2df8b5b1de3","Linux 4.10"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:13.507","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89856","references":[{"url":"https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:53.992Z","epss":0.00182,"epssPercentile":0.0807,"slug":"CVE-2026-89856","body":"## Overview\n\nIn 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).\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":46,"depthScoreParts":{"impact":46.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205198,"id":"CVE-2026-89856","ts":1789570705690,"field":"cvss","old":null,"new":"8.4"},{"seq":205197,"id":"CVE-2026-89856","ts":1789570705690,"field":"severity","old":"none","new":"high"}]}