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RDMA/mlx5: Fix integer overflow of user QP buffer size

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2026-90435

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-90435

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/mlx5/qp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.11"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.11",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.52",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.6",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/infiniband/hw/mlx5/qp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-90435

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#36750 · Revision 1
Added to Heist Feed
Publisher date
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