---
id: CVE-2026-89606
title: 'kernel: ecryptfs: reject too-small tag 70 packets (CVE-2026-89606)'
summary: >-
  A flaw was found in ecryptfs, a component of the Linux kernel. This
  vulnerability allows a remote attacker to send a specially crafted tag 70
  packet with a body smaller than expected. This can lead to an integer
  underflow during size calcu…
severity: high
cvss: 7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: vendor
cwe: CWE-191
vendor: Red Hat
product: Red Hat Enterprise Linux 6
affected:
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T22:15:26+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89606'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532266'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89606'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89606'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89606.mbox
  - url: 'https://git.kernel.org/stable/c/df5f375a6151ef71f636da044bcef90c26697255'
  - url: 'https://git.kernel.org/stable/c/5668121974eb7f7aa82793a9d0d13abadb8904dc'
  - url: 'https://git.kernel.org/stable/c/2e5afed9503dd1d85004c09503adc2cb584c0188'
  - url: 'https://git.kernel.org/stable/c/414a0f04feb06f03523edf7e2a8be1d7f1a9b160'
  - url: 'https://git.kernel.org/stable/c/9d88391bbed76eb091cddd50b0af87b1c6f22589'
  - url: 'https://git.kernel.org/stable/c/b31da1ecf13929a8d7f8d2727843d2fe35396b75'
  - url: 'https://git.kernel.org/stable/c/d2869768eab5648e6edc05f47e0716e5328e6681'
  - url: 'https://git.kernel.org/stable/c/e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00138
epssPercentile: 0.03602
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

A flaw was found in ecryptfs, a component of the Linux kernel. This vulnerability allows a remote attacker to send a specially crafted tag 70 packet with a body smaller than expected. This can lead to an integer underflow during size calculation, potentially causing a denial of service (DoS) or system instability.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89606.json)

**kernel: ecryptfs: reject too-small tag 70 packets** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

- Red Hat Enterprise Linux 6

No fix planned:

- Red Hat Enterprise Linux 6

Not affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope