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CVE-2026-90008

Estado: RecibidaAlta (7.8)—

In the Linux kernel, the following vulnerability has been resolved:

scsi: megaraid_sas: Limit NVMe request size to the PRP chain frame

megasas_make_prp_nvme() builds a command's PRP list in cmd->sg_frame, a DMA pool buffer of instance->max_chain_frame_sz bytes, spending one entry per NVMe page of the transfer plus one per page of the buffer for the chain pointer. The loop runs until the transfer is described and never checks the buffer bound.

max_hw_sectors comes straight from the MDTS the firmware reports for the drive. On drives with a large MDTS the only thing keeping the list inside the buffer was the block layer default of 1280 KiB, which needs 320 entries, which fit into a 4 KiB frame as that holds 512. But since commit 9b8b84879d4a ("block: Increase BLK_DEF_MAX_SECTORS_CAP") that default is 4 MiB, and such a transfer needs 1025 entries, so the list runs a full page past the end of the frame:

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If the page after the frame happens to be mapped, the overrun does not fault but silently corrupts the neighbouring pool entry, which is another in-flight command's PRP list.

Cap max_hw_sectors at what the chain frame can describe, less one page for transfers that do not start on a page boundary and so need one entry more. This is the megaraid_sas counterpart of commit 04631f55afc5 ("scsi: mpt3sas: Limit NVMe request size to 2 MiB"), but derives the limit from max_chain_frame_sz rather than hardcoding it.

Detalles técnicos trazas, registros y código del informe original
  sd 1:0:1:0: [sdb] tag#630 page boundary ptr_sgl: 0x00000000ba62d13f
  BUG: unable to handle page fault for address: ff663bcb81e7c000
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  RIP: 0010:megasas_build_and_issue_cmd_fusion+0xeaa/0x1870 [megaraid_sas]

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de kernel Linux con AV:L/PR:L que permite desbordamiento de búfer en controlador megaraid_sas. Escalada por acceso local; impacto incluye DoS (fallo de página) y corrupción de memoria en comandos activos.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-90008",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.8,
          "attackVector": "LOCAL",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "integrityImpact": "HIGH",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "HIGH"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "lessThan": "4bb34769ef44ab3770b89e4055de6af4a458bec9",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "lessThan": "4dd118d06dec9efe5065ac7897bdc18f404a3af4",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9b8b84879d4adc506b0d3944e20b28d9f3f6994b",
              "lessThan": "af8c27375733fb6a6df9fa484cda77cc3dd0cb80",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/scsi/megaraid/megaraid_sas_base.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.17"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.17",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.51",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "7.2.5",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "status": "unaffected",
              "version": "7.3-rc2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/scsi/megaraid/megaraid_sas_base.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-09-16T11:17:13.443",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/4bb34769ef44ab3770b89e4055de6af4a458bec9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4dd118d06dec9efe5065ac7897bdc18f404a3af4",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/af8c27375733fb6a6df9fa484cda77cc3dd0cb80",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Received",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: megaraid_sas: Limit NVMe request size to the PRP chain frame\n\nmegasas_make_prp_nvme() builds a command's PRP list in cmd->sg_frame, a\nDMA pool buffer of instance->max_chain_frame_sz bytes, spending one\nentry per NVMe page of the transfer plus one per page of the buffer for\nthe chain pointer. The loop runs until the transfer is described and\nnever checks the buffer bound.\n\nmax_hw_sectors comes straight from the MDTS the firmware reports for the\ndrive. On drives with a large MDTS the only thing keeping the list\ninside the buffer was the block layer default of 1280 KiB, which needs\n320 entries, which fit into a 4 KiB frame as that holds 512. But since\ncommit 9b8b84879d4a (\"block: Increase BLK_DEF_MAX_SECTORS_CAP\") that\ndefault is 4 MiB, and such a transfer needs 1025 entries, so the list\nruns a full page past the end of the frame:\n\n  sd 1:0:1:0: [sdb] tag#630 page boundary ptr_sgl: 0x00000000ba62d13f\n  BUG: unable to handle page fault for address: ff663bcb81e7c000\n  #PF: supervisor write access in kernel mode\n  #PF: error_code(0x0002) - not-present page\n  RIP: 0010:megasas_build_and_issue_cmd_fusion+0xeaa/0x1870 [megaraid_sas]\n\nIf the page after the frame happens to be mapped, the overrun does not\nfault but silently corrupts the neighbouring pool entry, which is\nanother in-flight command's PRP list.\n\nCap max_hw_sectors at what the chain frame can describe, less one page\nfor transfers that do not start on a page boundary and so need one entry\nmore. This is the megaraid_sas counterpart of commit 04631f55afc5\n(\"scsi: mpt3sas: Limit NVMe request size to 2 MiB\"), but derives the\nlimit from max_chain_frame_sz rather than hardcoding it."
    }
  ],
  "lastModified": "2026-09-16T15:18:24.433",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}