CVE-2026-90435

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20affected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < d99622e40aaa910ade681dfd4dc0fa240a011331affected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < c845e5e05140ea1bc64a5b1107942d93c876034daffected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < 42fb8aefffff5b458aaa66803364a16e0ea44129affected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < d7fa2ff72ad1861eac194a4e0075d504ba8c246eaffected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77affected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < f917707f0de0832b8ab582391b1f64e549995c6caffected
LinuxLinuxe126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < dec47e4b0fe34afdf38caa72b4408ba95502e5deaffected
LinuxLinux3.11affected
LinuxLinux0 < 3.11unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.52 <= 6.18.*unaffected
LinuxLinux7.2.6 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References