---
id: CVE-2023-42755
title: >-
  A flaw was found in the IPv4 Resource Reservation Protocol (RSVP) classifier
  in the Linux kernel
summary: >-
  A flaw was found in the IPv4 Resource Reservation Protocol (RSVP) classifier
  in the Linux kernel. The xprt pointer may go beyond the linear part of the
  skb, leading to an out-of-bounds read in the `rsvp_classify` function. This
  issue may…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H'
cwe:
  - CWE-125
vendor: linux
product: linux_kernel
affected:
  - linux_kernel < 6.3
  - enterprise_linux = 8.0
  - debian_linux = 10.0
patched:
  - linux_kernel 6.3
published: '2023-10-05'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T00:16:37.623'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-42755'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:2950'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:3138'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/security/cve/CVE-2023-42755'
    label: secalert@redhat.com
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2239847'
    label: secalert@redhat.com
  - url: 'https://seclists.org/oss-sec/2023/q3/229'
    label: secalert@redhat.com
  - url: 'https://access.redhat.com/errata/RHSA-2024:2950'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/errata/RHSA-2024:3138'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://access.redhat.com/security/cve/CVE-2023-42755'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2239847'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html'
    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://seclists.org/oss-sec/2023/q3/229'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.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
epss: 0.00396
epssPercentile: 0.32074
ingestedAt: '2026-10-15T01:08:04.208Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2025-06-17T14:12:38.468496Z'
---

## Overview

A flaw was found in the IPv4 Resource Reservation Protocol (RSVP) classifier in the Linux kernel. The xprt pointer may go beyond the linear part of the skb, leading to an out-of-bounds read in the `rsvp_classify` function. This issue may allow a local user to crash the system and cause a denial of service.

## Affected

- `linux_kernel < 6.3`
- `enterprise_linux = 8.0`
- `debian_linux = 10.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.3`