CVE-2026-90435 (GCVE-0-2026-90435)
Vulnerability from cvelistv5
Published
2026-09-17 16:09
Modified
2026-10-19 09:03
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
Version: e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/qp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.11"
            },
            {
              "lessThan": "3.11",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.270",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.221",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.270",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
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                  "versionEndExcluding": "5.15.221",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
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                },
                {
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                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3",
                  "versionStartIncluding": "3.11",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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-\u003esq.offset in\n_create_user_qp() before set_user_buf_size() is reached."
        }
      ],
      "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 overflowing inputs are mlx5_ib_create_qp.rq_wqe_count and rq_wqe_shift in driver udata, copied by ib_copy_from_udata() in mlx5_ib_create_qp() from a local write/ioctl on /dev/infiniband/uverbsN (IB_USER_VERBS_CMD_CREATE_QP / UVERBS_METHOD_QP_CREATE). A remote RoCE/InfiniBand peer does not supply those fields.\nAC:L - The attacker sets rq_wqe_count and rq_wqe_shift directly. set_rq_size() copies them into qp-\u003erq without bounding wqe_cnt against log_max_qp_sz (only ib_uverbs_ex_create_qp.max_recv_wr is capped), so a small max_recv_wr plus a huge rq_wqe_count reliably overflows the signed wqe_cnt\u003c\u003cwqe_shift in set_user_buf_size() and the sq.offset shift in _create_user_qp().\nPR:L - ib_uverbs_open() and ib_uverbs_alloc_pd() have no capability check, and uverbs_devnode() creates /dev/infiniband/uverbs* as 0666. IB_QPT_RC CREATE_QP does not call rdma_uattrs_has_raw_cap() (that gate is only IB_QPT_RAW_PACKET), so an unprivileged local user with uverbs access can reach the overflow.\nUI:N - The attacker opens uverbs, allocates a PD and CQ, and issues CREATE_QP with crafted mlx5_ib_create_qp.rq_wqe_count/rq_wqe_shift. No other user must mount a device, open a file, or confirm the operation.\nS:U - The mismatch is between ib_umem_get_attr_or_va() pinning and the same process\u0027s mlx5 CREATE_QP WQ programming. Resulting DMA or kernel corruption stays in the host kernel that serves that uverbs file; it is not a guest-to-host or IOMMU cross-VM escape.\nC:H - A wrapped wqe_cnt\u003c\u003cwqe_shift produces a small ubuffer.buf_size, so ib_umem_get_attr_or_va() and mlx5_ib_populate_pas() register fewer pages than create_user_qp() programs via log_rq_size/log_rq_stride. The NIC then DMA-reads past the pinned QP buffer, disclosing kernel or other-process memory.\nI:H - The same undersized PAS versus programmed RQ size lets hardware DMA-write beyond the umem into adjacent physical pages, and a wrapped qp-\u003esq.offset misplaces the send queue in the combined buffer. That is an out-of-bounds write usable for corruption and control-flow hijack.\nA:H - Hardware accessing an RQ larger than the pinned umem, or firmware CREATE_QP with a truncated PAS list, causes IOMMU faults, device errors, or a kernel oops/panic; a negative overflowed buf_size passed to ib_umem_get_attr_or_va() as size_t can also fault during QP setup."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T09:03:41.405Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20"
        },
        {
          "url": "https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331"
        },
        {
          "url": "https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d"
        },
        {
          "url": "https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129"
        },
        {
          "url": "https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e"
        },
        {
          "url": "https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77"
        },
        {
          "url": "https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c"
        },
        {
          "url": "https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de"
        }
      ],
      "title": "RDMA/mlx5: Fix integer overflow of user QP buffer size",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90435",
    "datePublished": "2026-09-17T16:09:54.399Z",
    "dateReserved": "2026-09-11T19:38:34.815Z",
    "dateUpdated": "2026-10-19T09:03:41.405Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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