{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/dibs/dibs_loopback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "ee188a6b264b71315a67f1b9470faad308b730d2",
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "versionType": "git"
            },
            {
              "lessThan": "b2f426a9a22886071966432ede8fceafffe12b8c",
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "versionType": "git"
            },
            {
              "lessThan": "94fe0ab01b480b52bd8f977edbd845ef375d69fd",
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "versionType": "git"
            },
            {
              "lessThan": "78237e3c0720fcc6eb9b87e90fd70f63eeca886f",
              "status": "affected",
              "version": "f7a22071dbf316c982fb44308874bd7ad9ac2091",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/dibs/dibs_loopback.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.10"
            },
            {
              "lessThan": "6.10",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.97",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.40",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.97",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.40",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.1.5",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2",
                  "versionStartIncluding": "6.10",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndibs: loopback: validate offset and size in move_data()\n\nThe loopback move_data() performs a memcpy into the registered DMB\nwithout checking whether offset + size exceeds the DMB length.  Unlike\nreal ISM hardware, which enforces memory region bounds natively, the\nsoftware loopback has no such protection.\n\nA peer-supplied out-of-bounds offset or oversized write would result in\nan OOB write past the allocated kernel buffer.  Add an explicit bounds\ncheck before the memcpy to reject such requests with -EINVAL."
        }
      ],
      "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 flaw is only reachable via loopback-ISM (intra-OS DIBS), which requires matching local GID and shared kernel; exploitation is through AF_SMC sendmsg after SMC-D handshake, not remote packet handling on a network-facing stack path.\nAC:L - A malicious SMC-D peer can supply crafted CLC dmbe_idx/dmbe_size values and send patterns that drive move_data() with attacker-controlled offset and size; no race or uncontrollable memory layout is required once loopback-ISM is active.\nPR:L - Exploitation requires only an unprivileged local account able to open AF_SMC sockets and complete an SMC-D loopback handshake (no CAP_NET_ADMIN or root); the SMC CLC path performs no authentication beyond standard socket access controls.\nUI:N - No victim user action is needed when a malicious peer initiates an inbound SMC-D connection to a listening service; the attacker can trigger the OOB write by sending SMC-D data after handshake completion.\nS:U - The OOB write corrupts kernel heap memory within the same kernel security authority; successful exploitation yields local privilege escalation, not cross-VM, container-boundary, or IOMMU bypass scope change.\nC:H - An out-of-bounds kernel heap write past the folio-allocated DMB buffer can corrupt adjacent kernel objects and be leveraged for arbitrary kernel memory disclosure, not merely a bounded leak or pure crash.\nI:H - The unchecked memcpy() allows controlled out-of-bounds writes beyond the registered DMB allocation, enabling heap corruption and potential arbitrary kernel code execution or control-flow hijacking.\nA:H - Writing past the allocated DMB folio can immediately corrupt critical kernel structures and cause kernel oops, panic, or hang; heap corruption from the OOB write itself constitutes high availability impact."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:39:27.125Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ee188a6b264b71315a67f1b9470faad308b730d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/b2f426a9a22886071966432ede8fceafffe12b8c"
        },
        {
          "url": "https://git.kernel.org/stable/c/94fe0ab01b480b52bd8f977edbd845ef375d69fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/78237e3c0720fcc6eb9b87e90fd70f63eeca886f"
        }
      ],
      "title": "dibs: loopback: validate offset and size in move_data()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72018",
    "datePublished": "2026-08-15T05:51:45.360Z",
    "dateReserved": "2026-08-09T03:40:39.900Z",
    "dateUpdated": "2026-08-17T05:39:27.125Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}