---
id: CVE-2023-6606
title: >-
  An out-of-bounds read vulnerability was found in smbCalcSize in
  fs/smb/client/netmisc.c in the Linux Kernel
summary: >-
  An out-of-bounds read vulnerability was found in smbCalcSize in
  fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local
  attacker to crash the system or leak internal kernel information.
severity: high
cvss: 7.1
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H'
cwe:
  - CWE-125
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 6.4.1, < 6.7'
  - linux_kernel = 6.4
  - linux_kernel = 6.7
  - enterprise_linux = 8.0
  - enterprise_linux = 9.0
  - enterprise_linux_eus = 9.2
  - enterprise_linux_eus = 9.4
  - enterprise_linux_server_aus = 9.2
  - enterprise_linux_server_aus = 9.4
  - >-
    enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions
    = 9.2
  - >-
    enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions
    = 9.2_ppc64le
patched:
  - linux_kernel 6.7
published: '2023-12-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T23:17:19.523'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-6606'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:0723'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0725'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0881'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0897'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:1188'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:1248'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:1404'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:2094'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-6606'
    label: secalert@redhat.com
  - url: 'https://bugzilla.kernel.org/show_bug.cgi?id=218218'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2253611'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:0723'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:0725'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:0881'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:0897'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:1188'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:1248'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:1404'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:2094'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-6606'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.kernel.org/show_bug.cgi?id=218218'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2253611'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/01/msg00004.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00016.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-794697.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00526
epssPercentile: 0.4318
ingestedAt: '2026-10-15T00:02:07.134Z'
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2023-12-11T21:20:47.767463Z'
---

## Overview

An out-of-bounds read vulnerability was found in smbCalcSize in fs/smb/client/netmisc.c in the Linux Kernel. This issue could allow a local attacker to crash the system or leak internal kernel information.

## Affected

- `linux_kernel >= 6.4.1, < 6.7`
- `linux_kernel = 6.4`
- `linux_kernel = 6.7`
- `enterprise_linux = 8.0`
- `enterprise_linux = 9.0`
- `enterprise_linux_eus = 9.2`
- `enterprise_linux_eus = 9.4`
- `enterprise_linux_server_aus = 9.2`
- `enterprise_linux_server_aus = 9.4`
- `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2`
- `enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions = 9.2_ppc64le`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.7`