---
title: "CVE-2026-90414: Linux Kernel IB/isert - Out-of-Bounds Read"
description: "Linux kernel IB/isert contains an out-of-bounds read vulnerability caused by accepting PDUs declaring more data than actually received, letting remote initiators cause memory corruption, exploit requires a malicious initiator after login."
url: https://panop.io/threat-heartbeat/CVE-2026-90414/
---

# CVE-2026-90414 Linux Kernel IB/isert - Out-of-Bounds Read

Linux kernel IB/isert contains an out-of-bounds read vulnerability caused by accepting PDUs declaring more data than actually received, letting remote initiators cause memory corruption, exploit requires a malicious initiator after login.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.51% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90414)

## Details

Type

Out-of-Bounds Read

Impact

Denial Of Service, Data Tampering

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Published

17 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the patch that validates PDU lengths against actual received data.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-90414](https://nvd.nist.gov/vuln/detail/CVE-2026-90414)
- [https://git.kernel.org/stable/c/bc58e9d3dc560220c57b8bdfc12af0cff1c8a43d](https://git.kernel.org/stable/c/bc58e9d3dc560220c57b8bdfc12af0cff1c8a43d)
- [https://git.kernel.org/stable/c/cf36fa5357a2fb25776a568d13a3653da7d99bcb](https://git.kernel.org/stable/c/cf36fa5357a2fb25776a568d13a3653da7d99bcb)
- [https://git.kernel.org/stable/c/274b1ad7e78338710864c4b4235bb1ce7e7107f9](https://git.kernel.org/stable/c/274b1ad7e78338710864c4b4235bb1ce7e7107f9)
- [https://git.kernel.org/stable/c/2a6b8f88fb7ee51714a1922a039225bdcaf12855](https://git.kernel.org/stable/c/2a6b8f88fb7ee51714a1922a039225bdcaf12855)
- [https://git.kernel.org/stable/c/352dc85324b29f5c85876f2666f3158b645e3f18](https://git.kernel.org/stable/c/352dc85324b29f5c85876f2666f3158b645e3f18)
- [https://git.kernel.org/stable/c/39da0b7e1f530347d284cebcfc5b5afa90a173bf](https://git.kernel.org/stable/c/39da0b7e1f530347d284cebcfc5b5afa90a173bf)
- [https://git.kernel.org/stable/c/957f92ea4022fb6af4618271615a2a21a7b5bef9](https://git.kernel.org/stable/c/957f92ea4022fb6af4618271615a2a21a7b5bef9)
- [https://git.kernel.org/stable/c/b4706722ed3ea72882b3c986a19b4a1ba66384c4](https://git.kernel.org/stable/c/b4706722ed3ea72882b3c986a19b4a1ba66384c4)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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