---
id: CVE-2026-89606
title: 'ecryptfs: reject too-small tag 70 packets'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ecryptfs: reject too-small tag 70 packets

  ecryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the
  parsed packet body size to derive the encrypted filen…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-191
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    df5f375a6151ef71f636da044bcef90c26697255
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    5668121974eb7f7aa82793a9d0d13abadb8904dc
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    2e5afed9503dd1d85004c09503adc2cb584c0188
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    414a0f04feb06f03523edf7e2a8be1d7f1a9b160
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    9d88391bbed76eb091cddd50b0af87b1c6f22589
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    b31da1ecf13929a8d7f8d2727843d2fe35396b75
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    d2869768eab5648e6edc05f47e0716e5328e6681
  - >-
    Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab <
    e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f
  - Linux 2.6.29
published: '2026-09-11'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:49:37.417Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-89606'
references:
  - 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'
  - 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
tags:
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00139
epssPercentile: 0.03214
scores:
  cna: 7.8
  vendor: 7
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

ecryptfs: reject too-small tag 70 packets

ecryptfs_parse_tag_70_packet() subtracts fixed metadata fields from the
parsed packet body size to derive the encrypted filename size.  A
malformed packet with a body smaller than those fixed fields can underflow
that size calculation.

Reject tag 70 packets before the subtraction unless the body contains the
signature, cipher code, and at least one byte of encrypted filename data.

## Affected

- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < df5f375a6151ef71f636da044bcef90c26697255`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < 5668121974eb7f7aa82793a9d0d13abadb8904dc`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < 2e5afed9503dd1d85004c09503adc2cb584c0188`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < 414a0f04feb06f03523edf7e2a8be1d7f1a9b160`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < 9d88391bbed76eb091cddd50b0af87b1c6f22589`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < b31da1ecf13929a8d7f8d2727843d2fe35396b75`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < d2869768eab5648e6edc05f47e0716e5328e6681`
- `Linux >= 9c79f34f7ee71cd28272332b424ca64b2be006ab < e97bbe1b2bd82ec2ae37ad2e4965b4d3e78bbf7f`
- `Linux 2.6.29`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## 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)