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CVE-2026-90435

7.8 · HIGH

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 use…

Published Sep 17, 2026EPSS 0.13%

Overview

CVE-2026-90435 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129Refgit.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77Refgit.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034dRefgit.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20Refgit.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246eRefgit.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331Refgit.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5deRefgit.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c

How CyberStrike helps

Frequently asked questions

What is CVE-2026-90435?

CVE-2026-90435 is a high-severity vulnerability. It was published on September 17, 2026 and has a CVSS 3.1 base score of 7.8 (HIGH).

How severe is CVE-2026-90435?

This vulnerability has a CVSS 3.1 base score of 7.8, rated HIGH. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-90435?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-90435?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-90435 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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