---
title: "CVE-2026-90413: Linux Kernel - Out-of-Bounds Read"
description: "Linux kernel contains a buffer over-read vulnerability in IB/isert due to accepting login PDUs declaring more data than received, letting remote attackers cause out-of-bounds read, exploit requires crafted login PDUs with mismatched declared length."
url: https://panop.io/threat-heartbeat/CVE-2026-90413/
---

# CVE-2026-90413 Linux Kernel - Out-of-Bounds Read

Linux kernel contains a buffer over-read vulnerability in IB/isert due to accepting login PDUs declaring more data than received, letting remote attackers cause out-of-bounds read, exploit requires crafted login PDUs with mismatched declared length.

CVSS base score 9.1 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.82% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-90413)

## Details

Type

Out-of-Bounds Read

Impact

Information Disclosure, Denial Of Service

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 fix for IB/isert login PDU length validation.

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-2026-90413](https://nvd.nist.gov/vuln/detail/CVE-2026-90413)
- [https://git.kernel.org/stable/c/b1f3313e7b3e396e4985fea5c709477387e0a065](https://git.kernel.org/stable/c/b1f3313e7b3e396e4985fea5c709477387e0a065)
- [https://git.kernel.org/stable/c/c345d9d0b3eefc990bb90cf565325785aab06aab](https://git.kernel.org/stable/c/c345d9d0b3eefc990bb90cf565325785aab06aab)
- [https://git.kernel.org/stable/c/0d9c0586af703890afe1bd0cfe641e3a3af1c32d](https://git.kernel.org/stable/c/0d9c0586af703890afe1bd0cfe641e3a3af1c32d)
- [https://git.kernel.org/stable/c/228aaa620fe6a7bc8b5b21dd348b4836b1760c61](https://git.kernel.org/stable/c/228aaa620fe6a7bc8b5b21dd348b4836b1760c61)
- [https://git.kernel.org/stable/c/2488b5b4827e5415768afc8daf097e8eb83c98df](https://git.kernel.org/stable/c/2488b5b4827e5415768afc8daf097e8eb83c98df)
- [https://git.kernel.org/stable/c/44fe800ec13386c88bd5b32bcd1deaa1e17535d5](https://git.kernel.org/stable/c/44fe800ec13386c88bd5b32bcd1deaa1e17535d5)
- [https://git.kernel.org/stable/c/48812c8103071d550d9ab4a3431be5bdc52255bc](https://git.kernel.org/stable/c/48812c8103071d550d9ab4a3431be5bdc52255bc)
- [https://git.kernel.org/stable/c/71ec8bbfa4a183f1e623662f9cfbcd702e433bdb](https://git.kernel.org/stable/c/71ec8bbfa4a183f1e623662f9cfbcd702e433bdb)

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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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