---
title: "CVE-2026-89743: Linux kernel misc: nsm - Information Disclosure"
description: "Linux kernel misc: nsm contains an out-of-bounds read caused by unbounded device-reported response length in nsm_sendrecv_msg_locked(), letting malicious backends disclose adjacent kernel heap, exploit requires malicious or buggy backend device."
url: https://panop.io/threat-heartbeat/CVE-2026-89743/
---

# CVE-2026-89743 Linux kernel misc: nsm - Information Disclosure

Linux kernel misc: nsm contains an out-of-bounds read caused by unbounded device-reported response length in nsm\_sendrecv\_msg\_locked(), letting malicious backends disclose adjacent kernel heap, exploit requires malicious or buggy backend device.

CVSS base score 7.7 /10

High

CISA KEV

Not listed

Public exploit

None known

EPSS

0.14% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89743)

## Details

Type

Information Disclosure

Impact

Information Disclosure

CVSS vector

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

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix for bounded response length in nsm\_sendrecv\_msg\_locked().

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-2026-89743](https://nvd.nist.gov/vuln/detail/CVE-2026-89743)
- [https://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30](https://git.kernel.org/stable/c/339f19b9a6171289b0e797deb8bda80b9a1fcc30)
- [https://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235](https://git.kernel.org/stable/c/808e530654a5354e6df78863a5d61e4d44e67235)
- [https://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294](https://git.kernel.org/stable/c/29e634a18957acda11383a15ab98a91c4ae9e294)
- [https://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf](https://git.kernel.org/stable/c/2aa0fb9c96f894a9c179a48e7522ea6705800adf)

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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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