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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HAffected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < d99622e40aaa910ade681dfd4dc0fa240a011331; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < c845e5e05140ea1bc64a5b1107942d93c876034d; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < 42fb8aefffff5b458aaa66803364a16e0ea44129; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < d7fa2ff72ad1861eac194a4e0075d504ba8c246e; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < f917707f0de0832b8ab582391b1f64e549995c6c; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < dec47e4b0fe34afdf38caa72b4408ba95502e5de |
| Linux | Linux | 3.11 |
References
- https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129
- https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77
- https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d
- https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20
- https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e
- https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331
- https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de
- https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c
Timeline
- Published
- Sep 17, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Received