---
id: CVE-2026-53268
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: conntrack_irc: fix possible out-of-bounds read

  When parsing fails after we've matched the command string we
  should bail out instead of trying to match a dif…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: conntrack_irc: fix possible out-of-bounds read

  When parsing fails after we've matched the command string we
  should bail out instead of trying to match a dif…
severity: high
cvss: 8.2
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H'
cwe:
  - CWE-125
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 2.6.20, < 5.10.259'
  - 'linux_kernel >= 5.11, < 5.15.210'
  - 'linux_kernel >= 5.16, < 6.1.176'
  - 'linux_kernel >= 6.2, < 6.6.143'
  - 'linux_kernel >= 6.7, < 6.12.94'
  - 'linux_kernel >= 6.13, < 6.18.36'
  - 'linux_kernel >= 6.19, < 7.0.13'
  - linux_kernel = 7.1
patched:
  - linux_kernel 7.0.13
published: '2026-06-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T09:18:15.393'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53268'
references:
  - url: 'https://git.kernel.org/stable/c/0afc802160af0df61ed374fdb97fb34cfe5cdf2f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4cdda7f868f48e2f81579371584fdbdce37df2c8'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/573810f61bcd6b6815e2ff53bbdd2b9c9d747176'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/66eba0ffce3b7e11449946b4cbbef8ea36112f56'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7c34f91305292083253df6a9f6c8ede02d4ccaea'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8a1d6e40dedfe1068aee094d851bd69e289c9fd6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/9e5da2379f968a3ea5a6e38921ab6201576466dc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ddddd8271359961e403d11c90c9ba9fc38914f7e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53268.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-53268'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2492770'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-53268'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-53268'
  - url: >-
      https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53268-9545@gregkh/T
  - url: 'https://access.redhat.com/errata/RHSA-2026:59723'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68531'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68532'
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00387
epssPercentile: 0.29924
ingestedAt: '2026-09-08T15:33:26.945Z'
scores:
  nvd: 8.2
  vendor: 7
---

## Overview

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

netfilter: conntrack_irc: fix possible out-of-bounds read

When parsing fails after we've matched the command string we
should bail out instead of trying to match a different command.

This helper should be deprecated, given prevalence of TLS I doubt it has
any relevance in 2026.

## Affected

- `linux_kernel >= 2.6.20, < 5.10.259`
- `linux_kernel >= 5.11, < 5.15.210`
- `linux_kernel >= 5.16, < 6.1.176`
- `linux_kernel >= 6.2, < 6.6.143`
- `linux_kernel >= 6.7, < 6.12.94`
- `linux_kernel >= 6.13, < 6.18.36`
- `linux_kernel >= 6.19, < 7.0.13`
- `linux_kernel = 7.1`

## Remediation

Upgrade past the affected range:

- `linux_kernel 7.0.13`

## Vendor advisories

- **RHSA-2026:59723** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux BaseOS (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9), Red Hat Enterprise Linux Real Time for NFV (v. 9), Red Hat Enterprise Linux Real Time (v. 9) · released 2026-08-26 · [advisory](https://access.redhat.com/errata/RHSA-2026:59723)
- **RHSA-2026:68531** · Red Hat · fixed in: Red Hat Enterprise Linux BaseOS (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68531)
- **RHSA-2026:68532** · Red Hat · fixed in: Red Hat Enterprise Linux NFV (v. 8), Red Hat Enterprise Linux RT (v. 8) · released 2026-09-17 · [advisory](https://access.redhat.com/errata/RHSA-2026:68532)
- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 9 · updated 2026-09-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53268.json)