{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8b6a361b8c482f22ac99c3273285ff16b23fba91"
            },
            {
              "fixed": "a31b6d18ded3cc32d9ee85a6ff0726d4274887b2"
            },
            {
              "fixed": "595e6537ad1a210da32cbb9a7f91aa73090915ba"
            },
            {
              "fixed": "3ef7e052cbd05a8b13a51a07b185a39ec93ee1cf"
            },
            {
              "fixed": "b2e26c955f8dd7e8d3f16c858db05245ea4fa817"
            },
            {
              "fixed": "6bc89f34a4597f9f6d41f7a60c67a3153bfe8851"
            },
            {
              "fixed": "423a78ff7928c2601013f73ec6d896f5597d0df5"
            },
            {
              "fixed": "75c93cd3c421890f49ea93f0b978b9b7bb10e5e3"
            },
            {
              "fixed": "7d29f7e9dbd844cae4d3e559cf78324b9642fd6b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.3.0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.96"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.39"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64268.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/siw: bound Read Response placement to the RREAD length\n\nIn drivers/infiniband/sw/siw/siw_qp_rx.c, siw_proc_rresp() places each\ninbound Read Response DDP segment at sge-\u003eladdr + wqe-\u003eprocessed and then\naccumulates wqe-\u003eprocessed, but it never checks the running total against\nthe sink buffer length on continuation segments. siw_check_sge() resolves\nand validates the sink memory only on the first fragment (the if (!*mem)\nbranch), and siw_rresp_check_ntoh() compares the cumulative length against\nwqe-\u003ebytes only on the final segment (the !frx-\u003emore_ddp_segs guard).\n\nA connected siw peer that answers an outstanding RREAD with Read Response\nsegments that keep the DDP Last flag clear, carrying more total payload\nthan the RREAD requested, drives wqe-\u003eprocessed past the validated sink\nbuffer; the next siw_rx_data() call writes out of bounds at\nsge-\u003eladdr + wqe-\u003eprocessed. siw runs iWARP over ordinary routable TCP,\nso the peer is the remote end of an established RDMA connection and needs\nno local privilege.\n\nBound every segment before placement, exactly as siw_proc_send() and\nsiw_proc_write() already do for their tagged and untagged paths, and\nterminate the connection with a base-or-bounds DDP error when the\nRead Response would overrun the sink buffer.\n\nThis is the second receive-path length fix for this file. A separate\nchange rejects an MPA FPDU length that underflows the per-fragment\nremainder in the header decode; that guard does not cover this case,\nbecause here each individual segment length is self-consistent and only\nthe accumulated placement offset overruns the buffer.",
  "id": "CVE-2026-64268",
  "modified": "2026-08-18T03:31:26.050567760Z",
  "published": "2026-07-25T08:49:16.336Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3ef7e052cbd05a8b13a51a07b185a39ec93ee1cf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/423a78ff7928c2601013f73ec6d896f5597d0df5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/595e6537ad1a210da32cbb9a7f91aa73090915ba"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6bc89f34a4597f9f6d41f7a60c67a3153bfe8851"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/75c93cd3c421890f49ea93f0b978b9b7bb10e5e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7d29f7e9dbd844cae4d3e559cf78324b9642fd6b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a31b6d18ded3cc32d9ee85a6ff0726d4274887b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b2e26c955f8dd7e8d3f16c858db05245ea4fa817"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64268.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64268"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RDMA/siw: bound Read Response placement to the RREAD length"
}