---
id: CVE-2026-89525
title: 'kernel: udf: reject VAT indexes equal to the entry count (CVE-2026-89525)'
summary: >-
  A flaw was found in the Linux kernel. A local attacker could craft a malicious
  Universal Disk Format (UDF) image to trigger an out-of-bounds read
  vulnerability in the `udf_get_pblock_virt15()` function. This occurs when the
  system attempts…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-1285
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-15'
sourceUpdated: '2026-09-15T06:19:18+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89525'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532509'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89525'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89525'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89525.mbox
  - url: 'https://git.kernel.org/stable/c/f64e01a90326bb85a3cc8aa0199931dc2f15b589'
  - url: 'https://git.kernel.org/stable/c/8a8c1c42a34349a0626d910abbad5a29136446b7'
  - url: 'https://git.kernel.org/stable/c/19f36c6453cd88fe6d60ef36ab1f1cad8ddf4ce4'
  - url: 'https://git.kernel.org/stable/c/b77b83f5529a26d084d64ece98abd6f0cc86e053'
  - url: 'https://git.kernel.org/stable/c/9193368408d792cec2057628d87862140fb1ce1c'
  - url: 'https://git.kernel.org/stable/c/b95c33a4e743874f1b0a45bf2aaa4da553552bd1'
  - url: 'https://git.kernel.org/stable/c/1bd7947f1463c21edafa256d0fbec5b99215e2b6'
  - url: 'https://git.kernel.org/stable/c/cac0cb07f29ccfb373fd4a36c81e908ef3ce608c'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0022
epssPercentile: 0.11147
ingestedAt: '2026-09-14T15:23:07.452Z'
---

## Overview

A flaw was found in the Linux kernel. A local attacker could craft a malicious Universal Disk Format (UDF) image to trigger an out-of-bounds read vulnerability in the `udf_get_pblock_virt15()` function. This occurs when the system attempts to read a Virtual Allocation Table (VAT) index equal to the entry count, bypassing a bounds check. This can lead to reading memory beyond the allocated table, potentially causing a kernel panic and a denial of service.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-09-15 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89525.json)

**kernel: udf: reject VAT indexes equal to the entry count** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-15.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- 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