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

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-04-27 14:03
VLAI?
Title
scsi: ibmvfc: Fix OOB access in ibmvfc_discover_targets_done()
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.
Severity ?
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Assigner
References
Impacted 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)
Create a notification for this product.
    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)
Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/ibmvscsi/ibmvfc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d842348f8a00d5b1d7358f207eb34ffcf5b16df3",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "a007246cb6c9ebdc93dafbf63cc2d43d98f402cc",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "4ed727e35b0ab17d3eeeb1e8023768396e2be161",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "d1466bf991b2343cf2ba8336e440c8faf3cbb780",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "786f10b1966e485046839f992e89f2c18cbd1983",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "bae4df0a643fa7f84663473aa3082a9c2ed139db",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            },
            {
              "lessThan": "61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f",
              "status": "affected",
              "version": "072b91f9c6510d0ec4a49d07dbc318760c7da7b3",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/ibmvscsi/ibmvfc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.27"
            },
            {
              "lessThan": "2.6.27",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.253",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.168",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.131",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.80",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.21",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.253",
                  "versionStartIncluding": "2.6.27",
                  "vulnerable": true
                },
                {
                  "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"
          }
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-27T14:03:20.476Z",
        "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": "2026-04-27T14:03:20.476Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-31464",
      "date": "2026-04-27",
      "epss": "0.00024",
      "percentile": "0.06785"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31464\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:42.450\",\"lastModified\":\"2026-04-27T14:16:39.843\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H\",\"baseScore\":8.1,\"baseSeverity\":\"HIGH\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/394a1cac3c12fdd7d77f19ccfd222ab5ff87ef89\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4ed727e35b0ab17d3eeeb1e8023768396e2be161\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/61d099ac4a7a8fb11ebdb6e2ec8d77f38e77362f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/786f10b1966e485046839f992e89f2c18cbd1983\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a007246cb6c9ebdc93dafbf63cc2d43d98f402cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bae4df0a643fa7f84663473aa3082a9c2ed139db\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1466bf991b2343cf2ba8336e440c8faf3cbb780\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d842348f8a00d5b1d7358f207eb34ffcf5b16df3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.