---
title: "CVE-2026-89691: Linux Kernel - Information Disclosure"
description: "Linux kernel contains an information disclosure vulnerability in nfsd4_release_compoundargs() caused by not clearing opcnt on compound arg release, letting attackers leak adjacent kernel memory via netlink, exploit requires crafted RPC requests."
url: https://panop.io/threat-heartbeat/CVE-2026-89691/
---

# CVE-2026-89691 Linux Kernel - Information Disclosure

Linux kernel contains an information disclosure vulnerability in nfsd4\_release\_compoundargs() caused by not clearing opcnt on compound arg release, letting attackers leak adjacent kernel memory via netlink, exploit requires crafted RPC requests.

CVSS base score 7.1 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Required

EPSS

0.12% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-89691)

## Details

Type

Information Disclosure

Impact

Information Disclosure

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/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 containing the fix.

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-2026-89691](https://nvd.nist.gov/vuln/detail/CVE-2026-89691)
- [https://git.kernel.org/stable/c/58bcdfb2b2e412088839ae740b1a95154dc0b8d0](https://git.kernel.org/stable/c/58bcdfb2b2e412088839ae740b1a95154dc0b8d0)
- [https://git.kernel.org/stable/c/ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a](https://git.kernel.org/stable/c/ae4c38555e81563b8dc5eae55ffd70f0ea97aa5a)
- [https://git.kernel.org/stable/c/c1a4f7b1848f95302df598217e1c7a1410c2d0c5](https://git.kernel.org/stable/c/c1a4f7b1848f95302df598217e1c7a1410c2d0c5)
- [https://git.kernel.org/stable/c/e879148867bd4c4cac42e063ffaffa187dddc6fe](https://git.kernel.org/stable/c/e879148867bd4c4cac42e063ffaffa187dddc6fe)

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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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