CVE-2026-89856 (GCVE-0-2026-89856)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:53
Severity ?
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: qla2xxx: Clamp MSI-X derived queue counts to avoid truncation ha->msix_count is u16, but ha->max_req_queues, ha->max_rsp_queues and ha->max_qpairs are u8. Deriving the queue count as "ha->max_req_queues = ha->msix_count - 1" therefore truncates: a board (or a misconfigured/malicious hot-plugged device) advertising 257 MSI-X vectors yields msix_count - 1 == 256, which truncates to 0. An MSI-X count of 1 zeroes it as well, and in target mode the subsequent "ha->max_req_queues--" then underflows 0 to 255. When the count is 0, qla2x00_alloc_queues() calls kzalloc_objs(struct req_que *, 0), which returns ZERO_SIZE_PTR. That is not NULL, so the allocation check passes and the following "ha->req_q_map[0] = req" dereferences ZERO_SIZE_PTR, corrupting memory or crashing the kernel. Add qla_calc_queue_count() to clamp the derived value into [1, QLA_MAX_QUEUES - 1] so it always fits in u8 and is never zero, and use it at all three derivation sites (qla25xx_iospace_config(), qla83xx_iospace_config() and qla24xx_enable_msix()). Also guard the target-mode decrement so it cannot reintroduce a zero (which would in turn underflow max_qpairs).
References
Impacted products
Vendor Product Version
Linux Linux Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
Version: d74595278f4ab192af66d9e60a9087464638beee
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "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": [
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              "status": "affected",
              "version": "d74595278f4ab192af66d9e60a9087464638beee",
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            }
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        },
        {
          "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"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                },
                {
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                },
                {
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                  "versionEndExcluding": "6.18.51",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.2.5",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "4.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003emsix_count is u16, but ha-\u003emax_req_queues, ha-\u003emax_rsp_queues and\nha-\u003emax_qpairs are u8. Deriving the queue count as\n\"ha-\u003emax_req_queues = ha-\u003emsix_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-\u003emax_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-\u003ereq_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": {
            "baseScore": 8.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:53:48.987Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89856",
    "datePublished": "2026-09-16T10:31:29.517Z",
    "dateReserved": "2026-09-11T19:38:34.771Z",
    "dateUpdated": "2026-10-19T08:53:48.987Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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