CVE-2026-89856

{"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 \u2192 iospace_config/qla24xx_enable_msix \u2192 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"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/scsi/qla2xxx/qla_inline.h", "drivers/scsi/qla2xxx/qla_isr.c", "drivers/scsi/qla2xxx/qla_os.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "cf623d32761b00f221a9cfded3303d56e84b429d", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "9eeddbeaa896f39d943644b16d83a6ad0ceab255", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "802068b9b683b8008fcccbf6e9ad133e597ec87c", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "e80adfeac61b4d5db7ffe0f5af43999c33a4145e", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "2efe50b2da829909023de4a2eb87badb7cfa53cc", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "7a448f5ed0b283dbde4e9183dd1e98c221432dab", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "33c77254e6e91f37c72c7fad4051777452b10de8", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}, {"lessThan": "ebfd35c64433821bd5619a6d07ccc2df8b5b1de3", "status": "affected", "version": "d74595278f4ab192af66d9e60a9087464638beee", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/scsi/qla2xxx/qla_inline.h", "drivers/scsi/qla2xxx/qla_isr.c", "drivers/scsi/qla2xxx/qla_os.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "4.10"}, {"lessThan": "4.10", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.270", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.221", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.188", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.157", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.110", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.51", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.5", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "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)."}], "id": "CVE-2026-89856", "lastModified": "2026-10-19T09:18:29.960", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 8.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.5, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-16T11:16:53.440", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/2efe50b2da829909023de4a2eb87badb7cfa53cc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/33c77254e6e91f37c72c7fad4051777452b10de8"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7a448f5ed0b283dbde4e9183dd1e98c221432dab"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/802068b9b683b8008fcccbf6e9ad133e597ec87c"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/9eeddbeaa896f39d943644b16d83a6ad0ceab255"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/cf623d32761b00f221a9cfded3303d56e84b429d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e80adfeac61b4d5db7ffe0f5af43999c33a4145e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ebfd35c64433821bd5619a6d07ccc2df8b5b1de3"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,cf623d32761b00f221a9cfded3303d56e84b429d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,9eeddbeaa896f39d943644b16d83a6ad0ceab255)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,802068b9b683b8008fcccbf6e9ad133e597ec87c)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,e80adfeac61b4d5db7ffe0f5af43999c33a4145e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,2efe50b2da829909023de4a2eb87badb7cfa53cc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,7a448f5ed0b283dbde4e9183dd1e98c221432dab)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,33c77254e6e91f37c72c7fad4051777452b10de8)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[d74595278f4ab192af66d9e60a9087464638beee,ebfd35c64433821bd5619a6d07ccc2df8b5b1de3)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "4.10"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,4.10)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.270,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.221,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.188,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.157,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.110,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.51,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.2.5,7.2.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-16T22:30:07.322554+00:00", "updated": "2026-09-18T09:30:06.179728+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-190", "CWE-681"]}