{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c"
            },
            {
              "fixed": "ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20"
            },
            {
              "fixed": "d99622e40aaa910ade681dfd4dc0fa240a011331"
            },
            {
              "fixed": "c845e5e05140ea1bc64a5b1107942d93c876034d"
            },
            {
              "fixed": "42fb8aefffff5b458aaa66803364a16e0ea44129"
            },
            {
              "fixed": "d7fa2ff72ad1861eac194a4e0075d504ba8c246e"
            },
            {
              "fixed": "5b6cfc6d7ff0959dd9766fdc24286a253b59ca77"
            },
            {
              "fixed": "f917707f0de0832b8ab582391b1f64e549995c6c"
            },
            {
              "fixed": "dec47e4b0fe34afdf38caa72b4408ba95502e5de"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.11.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90435.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx5: Fix integer overflow of user QP buffer size\n\nset_user_buf_size() computes the QP buffer size by left-shifting the\nuser-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers.\nA sufficiently large rq.wqe_cnt causes signed integer overflow, which\nis undefined behavior, and yields a small or negative buf_size, causing\nib_umem_get() to map a buffer smaller than the hardware will actually\nwrite into.\n\nReplace the shifts and addition with check_shl_overflow() and\ncheck_add_overflow(), rejecting invalid user inputs.\n\nMoreover, guard the identical shift computing qp-\u003esq.offset in\n_create_user_qp() before set_user_buf_size() is reached.",
  "id": "CVE-2026-90435",
  "modified": "2026-09-19T03:30:25.779081306Z",
  "published": "2026-09-17T16:09:54.399Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90435.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90435"
    },
    {
      "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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RDMA/mlx5: Fix integer overflow of user QP buffer size"
}