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CVE-2026-90435

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix integer overflow of user QP buffer size set_user_buf_size() computes the QP buffer size by left-shifting the user-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers. A sufficiently large rq.wqe_cnt causes signed integer overflow, which is undefined behavior, and yields a small or negative buf_size, causing ib_umem_get() to map a buffer smaller than the hardware will actually write into. Replace the shifts and addition with check_shl_overflow() and check_add_overflow(), rejecting invalid user inputs. Moreover, guard the identical shift computing qp->sq.offset in _create_user_qp() before set_user_buf_size() is reached.

Severity
HIGH
CVSS score
7.8 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-09-17 17:17:48.770000
Last modified
2026-10-19 09:19:37.810000
View original CVE JSON 
{
  "id": "CVE-2026-90435",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:48.770",
  "lastModified": "2026-10-19T09:19:37.810",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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->sq.offset in\n_create_user_qp() before set_user_buf_size() is reached."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "d99622e40aaa910ade681dfd4dc0fa240a011331",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "c845e5e05140ea1bc64a5b1107942d93c876034d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "42fb8aefffff5b458aaa66803364a16e0ea44129",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "d7fa2ff72ad1861eac194a4e0075d504ba8c246e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "5b6cfc6d7ff0959dd9766fdc24286a253b59ca77",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "f917707f0de0832b8ab582391b1f64e549995c6c",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c",
              "lessThan": "dec47e4b0fe34afdf38caa72b4408ba95502e5de",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "3.11",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "3.11",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.270",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.221",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.188",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}