CVE-2026-46105 (GCVE-0-2026-46105)
Vulnerability from cvelistv5
Published
2026-05-28 09:35
Modified
2026-08-05 12:29
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: mpt3sas: Limit NVMe request size to 2 MiB The HBA firmware reports NVMe MDTS values based on the underlying drive capability. However, because the driver allocates a fixed 4K buffer for the PRP list, accommodating at most 512 entries, the driver supports a maximum I/O transfer size of 2 MiB. Limit max_hw_sectors to the smaller of the reported MDTS and the 2 MiB driver limit to prevent issuing oversized I/O that may lead to a kernel oops.
References
Impacted products
Vendor Product Version
Linux Linux Version: 9b8b84879d4adc506b0d3944e20b28d9f3f6994b
Version: 9b8b84879d4adc506b0d3944e20b28d9f3f6994b
Version: 9b8b84879d4adc506b0d3944e20b28d9f3f6994b
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/mpt3sas/mpt3sas_scsih.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "45dcc815fc5539e88154315f36cbcb11d3a52fc2",
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "versionType": "git"
            },
            {
              "lessThan": "e5f9824817c6358b9f9738bdb92dec9e4e794d3c",
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "versionType": "git"
            },
            {
              "lessThan": "04631f55afc543d5431a2bdee7f6cc0f2c0debe7",
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/mpt3sas/mpt3sas_scsih.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "lessThan": "6.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "6.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: mpt3sas: Limit NVMe request size to 2 MiB\n\nThe HBA firmware reports NVMe MDTS values based on the underlying drive\ncapability. However, because the driver allocates a fixed 4K buffer for\nthe PRP list, accommodating at most 512 entries, the driver supports a\nmaximum I/O transfer size of 2 MiB.\n\nLimit max_hw_sectors to the smaller of the reported MDTS and the 2 MiB\ndriver limit to prevent issuing oversized I/O that may lead to a kernel\noops."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The vulnerable code is a SCSI/NVMe storage HBA driver with no network exposure; the overflow is reached by issuing block I/O to an NVMe device behind the controller, requiring local access to the affected system.\nAC:L - On an affected configuration (an NVMe drive reporting MDTS \u003e 2 MiB behind the HBA), the uncapped max_hw_sectors lets a single \u003e2 MiB I/O reach the driver, so the attacker reliably overflows the fixed 512-entry PRP buffer with no race or uncontrolled condition.\nPR:L - An ordinary unprivileged local user with read/write access to a file or block device on the NVMe drive can issue a large O_DIRECT request that the block layer submits as one oversized I/O; no root or special capability is needed.\nUI:N - The attacker triggers the overflow directly by submitting their own large I/O; no action by another user is required.\nS:U - The corruption is confined to kernel memory within the same security authority; there is no VM/IOMMU/sandbox boundary crossing.\nC:H - The out-of-bounds write corrupts the contiguous DMA pool holding PRP descriptors for other in-flight commands, and such memory corruption of DMA address lists can be leveraged to misdirect DMA and disclose memory contents.\nI:H - This is an out-of-bounds/heap write past the fixed PRP DMA buffer, corrupting adjacent kernel DMA-pool memory with attacker-influenced (page-address) data \u2014 classic memory-corruption integrity impact.\nA:H - Overrunning the fixed PRP buffer corrupts kernel memory and leads to a kernel oops/panic, as documented in the fix (\"may lead to a kernel oops\")."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:29:39.746Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/45dcc815fc5539e88154315f36cbcb11d3a52fc2"
        },
        {
          "url": "https://git.kernel.org/stable/c/e5f9824817c6358b9f9738bdb92dec9e4e794d3c"
        },
        {
          "url": "https://git.kernel.org/stable/c/04631f55afc543d5431a2bdee7f6cc0f2c0debe7"
        }
      ],
      "title": "scsi: mpt3sas: Limit NVMe request size to 2 MiB",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46105",
    "datePublished": "2026-05-28T09:35:09.126Z",
    "dateReserved": "2026-05-13T15:03:33.097Z",
    "dateUpdated": "2026-08-05T12:29:39.746Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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