{"id":"CVE-2026-90435","title":"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 v…","summary":"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 v…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < d99622e40aaa910ade681dfd4dc0fa240a011331","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < c845e5e05140ea1bc64a5b1107942d93c876034d","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < 42fb8aefffff5b458aaa66803364a16e0ea44129","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < d7fa2ff72ad1861eac194a4e0075d504ba8c246e","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < f917707f0de0832b8ab582391b1f64e549995c6c","Linux >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c < dec47e4b0fe34afdf38caa72b4408ba95502e5de","Linux 3.11"],"published":"2026-09-17","updated":"2026-09-18","sourceUpdated":"2026-09-18T18:17:59.280","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-90435","references":[{"url":"https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00129,"epssPercentile":0.02909,"ingestedAt":"2026-09-17T16:21:47.790Z","slug":"CVE-2026-90435","body":"## Overview\n\nIn 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->sq.offset in\n_create_user_qp() before set_user_buf_size() is reached.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":207325,"id":"CVE-2026-90435","ts":1789757340843,"field":"cvss","old":null,"new":"7.8"},{"seq":207324,"id":"CVE-2026-90435","ts":1789757340843,"field":"severity","old":"none","new":"high"}]}