---
id: CVE-2026-89607
title: >-
  kernel: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet
  (CVE-2026-89607)
summary: >-
  A flaw was found in ecryptfs in the Linux kernel. The parse_tag_3_packet()
  function does not properly validate the size of the encrypted key, allowing an
  oversized key to be processed. This improper validation leads to out-of-bounds
  writes…
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-787
vendor: Red Hat
product: Red Hat Enterprise Linux 6
affected:
  - enterprise_linux 6
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T09:42:44+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89607'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532523'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89607'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89607'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89607.mbox
  - url: 'https://git.kernel.org/stable/c/2cd21340163494d312836c77c9fbfe2530b3d075'
  - url: 'https://git.kernel.org/stable/c/e2152d491ae62d96a32ed59778680a242af1fbc6'
  - url: 'https://git.kernel.org/stable/c/d2802414081184f79a619ede178aeef3aa989793'
  - url: 'https://git.kernel.org/stable/c/33e050cac841498b5175f0f385eee903fd98863c'
  - url: 'https://git.kernel.org/stable/c/ccd13eff0e7356d2aa28b127b577e4e5ad4563f5'
  - url: 'https://git.kernel.org/stable/c/14cb36a500a5a3afbc955dbf69dabc565f1a3b26'
  - url: 'https://git.kernel.org/stable/c/a419c9ebfc9a40ee56aaad6dc68bfd67d400817b'
  - url: 'https://git.kernel.org/stable/c/5babe9c177c364521e3e682b949c5a8c47f4a441'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00176
epssPercentile: 0.06286
scores:
  vendor: 7
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

A flaw was found in ecryptfs in the Linux kernel. The parse_tag_3_packet() function does not properly validate the size of the encrypted key, allowing an oversized key to be processed. This improper validation leads to out-of-bounds writes, corrupting critical data structures within the ecryptfs_auth_tok and ecryptfs_crypt_stat structs. A local attacker could potentially exploit this memory corruption to achieve privilege escalation or cause a denial of service.

## Vendor advisories

- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 6 · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89607.json)

**kernel: ecryptfs: reject oversized encrypted_key_size in parse_tag_3_packet** — rated Important by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- 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

Refer to the advisory for fix availability.