Vulnerability-Lookup

FKIE_CVE-2026-31464

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-06-17 10:33

Severity

8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done() A malicious or compromised VIO server can return a num_written value in the discover targets MAD response that exceeds max_targets. This value is stored directly in vhost->num_targets without validation, and is then used as the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which is only allocated for max_targets entries. Indices at or beyond max_targets access kernel memory outside the DMA-coherent allocation. The out-of-bounds data is subsequently embedded in Implicit Logout and PLOGI MADs that are sent back to the VIO server, leaking kernel memory. Fix by clamping num_written to max_targets before storing it.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()\n\nA malicious or compromised VIO server can return a num_written value in the\ndiscover targets MAD response that exceeds max_targets. This value is\nstored directly in vhost-\u003enum_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation.  The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."
    }
  ],
  "id": "CVE-2026-31464",
  "lastModified": "2026-06-17T10:33:47.477",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
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        "impactScore": 5.2,
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        "type": "Secondary"
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  "published": "2026-04-22T14:16:42.450",
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          "value": "CWE-125"
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      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

CVE-2026-31464 (GCVE-0-2026-31464)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-08-05 12:22

Title

scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()

Summary

Severity

8.1 (High)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Assigner

Linux mitre root Scorecard

References

8 references

URL	Tags
https://git.kernel.org/stable/c/d842348f8a00d5b1d…
https://git.kernel.org/stable/c/a007246cb6c9ebdc9…
https://git.kernel.org/stable/c/394a1cac3c12fdd7d…
https://git.kernel.org/stable/c/4ed727e35b0ab17d3…
https://git.kernel.org/stable/c/d1466bf991b2343cf…
https://git.kernel.org/stable/c/786f10b1966e48504…
https://git.kernel.org/stable/c/bae4df0a643fa7f84…
https://git.kernel.org/stable/c/61d099ac4a7a8fb11…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < d842348f8a00d5b1d7358f207eb34ffcf5b16df3 (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < a007246cb6c9ebdc93dafbf63cc2d43d98f402cc (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89 (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 4ed727e35b0ab17d3eeeb1e8023768396e2be161 (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < d1466bf991b2343cf2ba8336e440c8faf3cbb780 (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 786f10b1966e485046839f992e89f2c18cbd1983 (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < bae4df0a643fa7f84663473aa3082a9c2ed139db (git) Affected: 072b91f9c6510d0ec4a49d07dbc318760c7da7b3 , < 61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f (git)
Linux	Linux	Affected: 2.6.27 Unaffected: 0 , < 2.6.27 (semver) Unaffected: 5.10.253 , ≤ 5.10.* (semver) Unaffected: 5.15.203 , ≤ 5.15.* (semver) Unaffected: 6.1.168 , ≤ 6.1.* (semver) Unaffected: 6.6.131 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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        {
          "defaultStatus": "unaffected",
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          "programFiles": [
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                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.203",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.168",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.131",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.80",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.21",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()\n\nA malicious or compromised VIO server can return a num_written value in the\ndiscover targets MAD response that exceeds max_targets. This value is\nstored directly in vhost-\u003enum_targets without validation, and is then used\nas the loop bound in ibmvfc_alloc_targets() to index into disc_buf[], which\nis only allocated for max_targets entries. Indices at or beyond max_targets\naccess kernel memory outside the DMA-coherent allocation.  The\nout-of-bounds data is subsequently embedded in Implicit Logout and PLOGI\nMADs that are sent back to the VIO server, leaking kernel memory.\n\nFix by clamping num_written to max_targets before storing it."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.1,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:A - Reachable through IBM Power VIO virtual Fibre Channel CRQ/MAD responses from the backing VIO server on the same virtual I/O fabric, not through a local syscall or routable network path.\nAC:L - A malicious or compromised VIO server directly controls the `num_written` value in the Discover Targets response; no race or hard-to-control condition is required once the adapter is initialized.\nPR:N - No privilege or authentication check in the Linux guest gates this completion path; the crafted response is accepted from the configured VIO partner.\nUI:N - The vulnerable discovery flow runs during adapter initialization/reinitialization and processes the VIO server response without requiring any end-user action.\nS:U - The impact is on the guest Linux kernel/driver resources that process the malicious virtual device response; this is not a VM escape or IOMMU/DMA boundary bypass.\nC:H - The excessive `num_written` causes out-of-bounds reads beyond the discovery buffer, and the derived values are sent back to the VIO server in Implicit Logout/PLOGI MADs, leaking kernel memory.\nI:N - The investigated bug is an out-of-bounds read used to construct outbound MAD fields; I did not find an out-of-bounds write or arbitrary kernel memory modification primitive.\nA:H - The server-controlled oversized count can drive reads far beyond the DMA-coherent allocation and create excessive target-processing work, making kernel oops, hang, or resource exhaustion plausible."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:22:45.348Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3"
        },
        {
          "url": "https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc"
        },
        {
          "url": "https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89"
        },
        {
          "url": "https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161"
        },
        {
          "url": "https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780"
        },
        {
          "url": "https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983"
        },
        {
          "url": "https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db"
        },
        {
          "url": "https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f"
        }
      ],
      "title": "scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31464",
    "datePublished": "2026-04-22T13:53:54.970Z",
    "dateReserved": "2026-03-09T15:48:24.097Z",
    "dateUpdated": "2026-08-05T12:22:45.348Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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FKIE_CVE-2026-31464

CVE-2026-31464 (GCVE-0-2026-31464)

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Sightings

Nomenclature

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