CVE-2026-90435Hinoki check available

Kernel memory corruption via QP size overflow

Published Sep 17, 2026 · Updated Sep 18, 2026

Integer overflow in the Linux kernel's RDMA/mlx5 QP creation path allows local users to corrupt kernel memory through crafted queue sizes. set_user_buf_size() left-shifts user-controlled rq.wqe_cnt and rq.wqe_shift as signed integers, so overflow makes ib_umem_get() map less memory than the device can write. Exploitation requires local access to an mlx5 InfiniBand/RDMA uverbs device; the resulting undersized mapping permits out-of-bounds hardware writes and can compromise or crash the host.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Get started

Summary

What happened

Integer overflow in the Linux kernel's RDMA/mlx5 QP creation path allows local users to corrupt kernel memory through crafted queue sizes. set_user_buf_size() left-shifts user-controlled rq.wqe_cnt and rq.wqe_shift as signed integers, so overflow makes ib_umem_get() map less memory than the device can write. Exploitation requires local access to an mlx5 InfiniBand/RDMA uverbs device; the resulting undersized mapping permits out-of-bounds hardware writes and can compromise or crash the host.

The record

CVE
CVE-2026-90435
Published
Sep 17, 2026
Updated
Sep 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.11
  2. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <42fb8aefffff5b458aaa66803364a16e0ea44129
  3. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <5b6cfc6d7ff0959dd9766fdc24286a253b59ca77
  4. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <c845e5e05140ea1bc64a5b1107942d93c876034d
  5. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20
  6. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d7fa2ff72ad1861eac194a4e0075d504ba8c246e
  7. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d99622e40aaa910ade681dfd4dc0fa240a011331
  8. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <dec47e4b0fe34afdf38caa72b4408ba95502e5de
  9. Affected versionversion=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <f917707f0de0832b8ab582391b1f64e549995c6c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.11; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <42fb8aefffff5b458aaa66803364a16e0ea44129; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <5b6cfc6d7ff0959dd9766fdc24286a253b59ca77; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <c845e5e05140ea1bc64a5b1107942d93c876034d; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d7fa2ff72ad1861eac194a4e0075d504ba8c246e; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <d99622e40aaa910ade681dfd4dc0fa240a011331; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <dec47e4b0fe34afdf38caa72b4408ba95502e5de; version=e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c <f917707f0de0832b8ab582391b1f64e549995c6c

Published CVSS scores

7.1Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
7.8Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Get started to see how Hinoki identifies affected software and validates exploitability in your environment.

Get started