CVE-2023-42755Public exploit

Kernel crash via unchecked RSVP offset

Published Oct 5, 2023 · Updated Nov 8, 2025

Out-of-bounds read in the RSVP classifier in Red Hat Enterprise Linux 8 allows local users to crash the kernel via crafted filter data. rsvp_change accepts an unchecked user-controlled unsigned offset in TCA_RSVP_PINFO, and rsvp_classify adds it to the transport-header pointer before reading. A local low-privileged user must reach the traffic-control classifier; successful exploitation interrupts the entire host.

CVSS severity6.5
Medium
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in the RSVP classifier in Red Hat Enterprise Linux 8 allows local users to crash the kernel via crafted filter data. rsvp_change accepts an unchecked user-controlled unsigned offset in TCA_RSVP_PINFO, and rsvp_classify adds it to the transport-header pointer before reading. A local low-privileged user must reach the traffic-control classifier; successful exploitation interrupts the entire host.

The record

CVE
CVE-2023-42755
Published
Oct 5, 2023
Updated
Nov 8, 2025
Vendor
Red Hat
Product
Red Hat Enterprise Linux 8
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 8, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Red Hat · Red Hat Enterprise Linux 8Affected versions are unavailable in this record.

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.5Red Hat, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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