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CVE-2023-42755

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

publishedCWE-125

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.

Technical severity6.5 mediumCVSS 3.1 · CNA: redhat
Published2023-10-05Source updated 2026-11-07
Collected2026-11-073 attributed sources

Fixes and workarounds

Workaround

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.

Source: CNA: redhat

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: [email protected]

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: af854a3a-2127-422b-91ae-364da2661108

Fix

The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches.

Source: af854a3a-2127-422b-91ae-364da2661108

Affected products and versions

ProductVersionsAuthority
Red Hat Enterprise Linux 8
Red Hat
kernel-rt
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:4.18.0-553.rt7.342.el8_10; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 8
Red Hat
kernel
https://access.redhat.com/downloads/content/package-browser/ 		≥ 0:4.18.0-553.el8_10; < * (unaffected, rpm)
Other versions: affected 		CNA: redhat
Red Hat Enterprise Linux 6
Red Hat
kernel
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unknown 		CNA: redhat
Red Hat Enterprise Linux 7
Red Hat
kernel
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unknown 		CNA: redhat
Red Hat Enterprise Linux 7
Red Hat
kernel-rt
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unknown 		CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
kernel
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unaffected 		CNA: redhat
Red Hat Enterprise Linux 9
Red Hat
kernel-rt
https://access.redhat.com/downloads/content/package-browser/ 		Range not reported
Other versions: unaffected 		CNA: redhat
SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Siemens 		≥ V3.1.0; < V3.1.5 (affected, custom)
Other versions: unknown 		ADP: siemens-SADP
SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Siemens 		≥ V3.1.0; < V3.1.5 (affected, custom)
Other versions: unknown 		ADP: siemens-SADP
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Siemens 		≥ 0; < V1.1 (affected, custom)
Other versions: unknown 		ADP: siemens-SADP
SIPLUS S7-1500 CPU 1518-4 PN/DP MFP
Siemens 		≥ V3.1.0; < V3.1.5 (affected, custom)
Other versions: unknown 		ADP: siemens-SADP

Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.

NVD applicability configurations (3)

These expressions retain AND/OR operators, negation, and required environmental products. A listed product is not sufficient to establish exposure when additional conditions apply.

[
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
            "versionEndExcluding": "6.3",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  },
  {
    "negate": false,
    "nodes": [
      {
        "cpeMatch": [
          {
            "criteria": "cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*",
            "vulnerable": true
          }
        ],
        "negate": false,
        "operator": "OR"
      }
    ],
    "operator": "OR"
  }
]

CVSS assessments

Version / scoreVectorAuthority
3.1 / 6.5
medium		 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HCNA: redhat
3.1 / 5.5
medium		 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HNVD: [email protected]
3.1 / 6.5
medium		 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:HNVD: [email protected]

Exploit evidence

References

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