{"id":"CVE-2026-89856","revision":"406b52ebef354c9dbf086341ce206565","records":[{"revision":"406b52ebef354c9dbf086341ce206565","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-89856","aliases":[],"title":"scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation","description":"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).","state":0,"publishedAt":"2026-09-16T10:31:29.517+00:00","modifiedAt":"2026-10-19T08:53:48.987+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/scsi/qla2xxx/qla_inline.h\",\n                        \"drivers/scsi/qla2xxx/qla_isr.c\",\n                        \"drivers/scsi/qla2xxx/qla_os.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"cf623d32761b00f221a9cfded3303d56e84b429d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"9eeddbeaa896f39d943644b16d83a6ad0ceab255\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"802068b9b683b8008fcccbf6e9ad133e597ec87c\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"e80adfeac61b4d5db7ffe0f5af43999c33a4145e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"2efe50b2da829909023de4a2eb87badb7cfa53cc\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"7a448f5ed0b283dbde4e9183dd1e98c221432dab\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"33c77254e6e91f37c72c7fad4051777452b10de8\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d74595278f4ab192af66d9e60a9087464638beee\",\n                            \"lessThan\": \"ebfd35c64433821bd5619a6d07ccc2df8b5b1de3\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/scsi/qla2xxx/qla_inline.h\",\n                        \"drivers/scsi/qla2xxx/qla_isr.c\",\n                        \"drivers/scsi/qla2xxx/qla_os.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.270\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.221\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.188\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":8.4,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d","https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255","https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c","https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e","https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc","https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab","https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8","https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-89856","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-89856","identifiers":["CVE-2026-89856"]},"retained":false,"historicalAffected":[]}],"coverage":[]}