---
title: "CVE-2026-89541: Linux Kernel - Out-of-Bounds Read"
description: "Linux kernel contains an out-of-bounds read vulnerability in SUNRPC gss_unwrap_resp_priv due to improper length checks on RPCSEC_GSS opaque length, letting a crafted krb5p NFS server cause memory corruption, exploit requires crafted RPCSEC_GSS reply."
url: https://panop.io/threat-heartbeat/CVE-2026-89541/
---

# CVE-2026-89541 Linux Kernel - Out-of-Bounds Read

Linux kernel contains an out-of-bounds read vulnerability in SUNRPC gss\_unwrap\_resp\_priv due to improper length checks on RPCSEC\_GSS opaque length, letting a crafted krb5p NFS server cause memory corruption, exploit requires crafted RPCSEC\_GSS reply.

CVSS base score 9.8 /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-2026-89541)

## 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:H/A:H

Published

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix for hardened gss\_unwrap\_resp\_priv length checks.

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-2026-89541](https://nvd.nist.gov/vuln/detail/CVE-2026-89541)
- [https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50](https://git.kernel.org/stable/c/3691c4b3488d8ca046b9941e5be30c626dbbbb50)
- [https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f](https://git.kernel.org/stable/c/401f6a5b338d05bb1069ad814d9f77e3c367854f)
- [https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0](https://git.kernel.org/stable/c/81fd7654a8429718adfcb2a7e03496077f547ed0)
- [https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a](https://git.kernel.org/stable/c/85fa6b12e8f439739ac36ef2aad925f37c8b976a)
- [https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2](https://git.kernel.org/stable/c/87831b92112c81db251d46756d65daa4f91af6a2)
- [https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a](https://git.kernel.org/stable/c/89a15a50f84d32d4b99db86f957427fcbe20a99a)
- [https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273](https://git.kernel.org/stable/c/d395c30d570ca6168f0297b191709927d1258273)
- [https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269](https://git.kernel.org/stable/c/ebcbd2523a8524c3d24e111cdbed8e271d910269)

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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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