CVE-2026-90435RDMA/mlx5: Fix integer overflow of user QP buffer size
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before d99622e40aaa910ade681dfd4dc0fa240a011331; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before c845e5e05140ea1bc64a5b1107942d93c876034d; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before 42fb8aefffff5b458aaa66803364a16e0ea44129; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before d7fa2ff72ad1861eac194a4e0075d504ba8c246e; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before f917707f0de0832b8ab582391b1f64e549995c6c; from e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c before dec47e4b0fe34afdf38caa72b4408ba95502e5de | CNA record |
References
- https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20
- https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331
- https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d
- https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129
- https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e
- https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77
- https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c
- https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.