{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89856", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.771Z", "datePublished": "2026-09-16T10:31:29.517Z", "dateUpdated": "2026-10-19T08:53:48.987Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:53:48.987Z" }, "descriptions": [ { "lang": "en", "value": "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)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 8.4, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The flaw is in qla2xxx PCI probe (qla2x00_probe_one → iospace_config/qla24xx_enable_msix → qla2x00_alloc_queues). QLogic FC HBAs are local PCI devices in storage servers, blades, and SAN hosts; a board or compromised adapter advertising a truncating MSI-X count triggers it at bind. Not a network/FC-frame path; local PCI is higher severity than physical hotplug.\nAC:L - The attacker-controlled PCI MSI-X vector count (config word or pci_msix_vec_count) is stored in u8 max_req_queues. Advertising 1 or 257+ vectors deterministically truncates that count to 0 and underflows max_qpairs to 255; no race or uninfluenced layout is required.\nPR:N - Probe reads the MSI-X count from the adapter and autoloads qla2xxx on matching QLogic PCI IDs with no capability or credential check. A malicious, misconfigured, or firmware-compromised HBA needs no Linux account or init-namespace privilege.\nUI:N - qla2x00_probe_one runs automatically on PCI enumeration at boot or hotplug bind; no victim must mount a filesystem, open a device node, or otherwise interact.\nS:U - The ZERO_SIZE_PTR store and any resulting oops or privilege escalation remain in the host kernel qla2xxx probe path, the same security authority. This is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - qla2x00_alloc_queues() writes request/response queue pointers through ZERO_SIZE_PTR and can desynchronize u8 queue maps versus MSI-X arrays (0 versus underflowed 255 qpairs). That kernel memory corruption can be leveraged for information disclosure.\nI:H - The wild write of kernel pointers through ZERO_SIZE_PTR, plus the u8 underflow that sizes queue-pair maps to 255 while the request map is a zero-size sentinel, is an out-of-bounds write exploitable for corruption and control-flow hijacking.\nA:H - Dereferencing ZERO_SIZE_PTR is defined to take a distinct access fault, so a malicious MSI-X count causes a kernel oops or panic during probe." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/qla2xxx/qla_inline.h", "drivers/scsi/qla2xxx/qla_isr.c", "drivers/scsi/qla2xxx/qla_os.c" ], "versions": [ { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "cf623d32761b00f221a9cfded3303d56e84b429d", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "9eeddbeaa896f39d943644b16d83a6ad0ceab255", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "802068b9b683b8008fcccbf6e9ad133e597ec87c", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "e80adfeac61b4d5db7ffe0f5af43999c33a4145e", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "2efe50b2da829909023de4a2eb87badb7cfa53cc", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "7a448f5ed0b283dbde4e9183dd1e98c221432dab", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "33c77254e6e91f37c72c7fad4051777452b10de8", "status": "affected", "versionType": "git" }, { "version": "d74595278f4ab192af66d9e60a9087464638beee", "lessThan": "ebfd35c64433821bd5619a6d07ccc2df8b5b1de3", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/qla2xxx/qla_inline.h", "drivers/scsi/qla2xxx/qla_isr.c", "drivers/scsi/qla2xxx/qla_os.c" ], "versions": [ { "version": "4.10", "status": "affected" }, { "version": "0", "lessThan": "4.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.110", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.51", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.5", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.12.110" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "6.18.51" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "7.2.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.10", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d" }, { "url": "https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255" }, { "url": "https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c" }, { "url": "https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e" }, { "url": "https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc" }, { "url": "https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab" }, { "url": "https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8" }, { "url": "https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3" } ], "title": "scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation", "x_generator": { "engine": "bippy-1.2.0" } } } }