GHSA-4FF5-3W52-WWV7
Vulnerability from github – Published: 2026-09-17 18:32 – Updated: 2026-09-18 18:31In 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.
{
"affected": [],
"aliases": [
"CVE-2026-90435"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-17T17:17:48Z",
"severity": "HIGH"
},
"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": "GHSA-4ff5-3w52-wwv7",
"modified": "2026-09-18T18:31:32Z",
"published": "2026-09-17T18:32:05Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90435"
},
{
"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"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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