CVE-2026-90435RDMA/mlx5: Fix integer overflow of user QP buffer size
- 7.8HighCVSS base score
- 0.13%Exploitation in 30 daysEPSS · top 97% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 32 days later
· 32 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.13% · top 97% of all CVEs (15 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < d99622e40aaa910ade681dfd4dc0fa240a011331
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < c845e5e05140ea1bc64a5b1107942d93c876034d
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < 42fb8aefffff5b458aaa66803364a16e0ea44129
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < d7fa2ff72ad1861eac194a4e0075d504ba8c246e
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < f917707f0de0832b8ab582391b1f64e549995c6c
- affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c – < dec47e4b0fe34afdf38caa72b4408ba95502e5de
- affected 3.11
- unaffected < 3.11
- unaffected 5.10.270 – ≤ 5.10.*
- unaffected 5.15.221 – ≤ 5.15.*
- unaffected 6.1.188 – ≤ 6.1.*
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.110 – ≤ 6.12.*
- unaffected 6.18.52 – ≤ 6.18.*
- unaffected 7.2.6 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20 (opens in a new tab)
- https://git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331 (opens in a new tab)
- https://git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d (opens in a new tab)
- https://git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129 (opens in a new tab)
- https://git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e (opens in a new tab)
- https://git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77 (opens in a new tab)
- https://git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c (opens in a new tab)
- https://git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-82096 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-90435)Record last updated .