Kernel: rsvp: out-of-bounds read in rsvp_classify()

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Summary

CVECVE-2023-42755
StatePUBLISHED
Assignerredhat
Source PriorityCVE Program / NVD first with legacy fallback
Published2023-10-05 19:15:11 UTC
Updated2026-10-15 00:16:37 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 5.5 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-125 | CWE-125 Out-of-bounds Read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Debian Debian Linux 10.0 All All All
Operating System Linux Linux Kernel All All All All
Operating System Redhat Enterprise Linux 8.0 All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.rt7.342.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 8 unaffected 0:4.18.0-553.el8_10 * rpm Not specified
CNA Red Hat Red Hat Enterprise Linux 6 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 7 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
CNA Red Hat Red Hat Enterprise Linux 9 Not specified Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected V1.1 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] [DLA 3623-1] linux-5.10 security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
cve-details af854a3a-2127-422b-91ae-364da2661108 access.redhat.com Third Party Advisory
2239847 – (CVE-2023-42755, ZDI-CAN-18387) CVE-2023-42755 kernel: rsvp: out-of-bounds read in rsvp_classify() af854a3a-2127-422b-91ae-364da2661108 bugzilla.redhat.com Issue Tracking, Patch, Third Party Advisory
oss-sec: [CVE-2023-42755] Linux kernel wild pointer access <= v6.2 af854a3a-2127-422b-91ae-364da2661108 seclists.org Exploit, Mailing List, Patch, Third Party Advisory
access.redhat.com/errata/RHSA-2024:3138 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
access.redhat.com/errata/RHSA-2024:2950 af854a3a-2127-422b-91ae-364da2661108 access.redhat.com
cert-portal.siemens.com/productcert/html/ssa-794697.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
lists.debian.org/debian-lts-announce/2024/01/msg00004.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

SourceTimeEvent
CNA2023-09-20T00:00:00.000ZReported to Red Hat.
CNA2023-09-25T00:00:00.000ZMade public.

Workarounds

CNA: This flaw can be mitigated by preventing the affected `cls_rsvp` kernel module from being loaded. For instructions on how to blacklist a kernel module, please see https://access.redhat.com/solutions/41278.

Legacy QID Mappings

  • 199841 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6444-1)
  • 199842 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6440-1)
  • 199843 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6439-1)
  • 199844 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-1)
  • 199845 Ubuntu Security Notification for Linux kernel (BlueField) Vulnerabilities (USN-6442-1)
  • 199846 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6441-1)
  • 199847 Ubuntu Security Notification for Linux kernel (OEM) Vulnerabilities (USN-6443-1)
  • 199848 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6446-1)
  • 199849 Ubuntu Security Notification for Linux kernel (Azure) Vulnerabilities (USN-6440-2)
  • 199854 Ubuntu Security Notification for Linux kernel (GCP) Vulnerabilities (USN-6441-2)
  • 199855 Ubuntu Security Notification for Linux kernel (AWS) Vulnerabilities (USN-6439-2)
  • 199858 Ubuntu Security Notification for Linux kernel (Intel IoTG) Vulnerabilities (USN-6445-2)
  • 199859 Ubuntu Security Notification for Linux kernel (StarFive) Vulnerabilities (USN-6444-2)
  • 199861 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6446-2)
  • 199864 Ubuntu Security Notification for Linux kernel (HWE) Vulnerabilities (USN-6440-3)
  • 199868 Ubuntu Security Notification for Linux kernel (Oracle) Vulnerabilities (USN-6446-3)
  • 199872 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6441-3)
  • 199874 Ubuntu Security Notification for Linux kernel Vulnerabilities (USN-6460-1)
  • 199883 Ubuntu Security Notification for Linux kernel (NVIDIA) Vulnerabilities (USN-6466-1)
  • 356357 Amazon Linux Security Advisory for kernel : ALAS-2023-1838
  • 356371 Amazon Linux Security Advisory for kernel : ALAS2023-2023-356
  • 356469 Amazon Linux Security Advisory for kernel : ALAS2KERNEL-5.10-2023-041
  • 379043 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX3-SA-2023:0136)
  • 379435 Alibaba Cloud Linux Security Update for cloud-kernel (ALINUX2-SA-2024:0012)
  • 6000265 Debian Security Update for linux-5.10 (DLA 3623-1)
  • 6000429 Debian Security Update for linux (DLA 3710-1)
  • 6140221 AWS Bottlerocket Security Update for kernel (GHSA-6w3c-v8fq-96cp)
  • 907466 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (31269)
  • 907534 Common Base Linux Mariner (CBL-Mariner) Security Update for kernel (31269-1)

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