CVE-2026-88833

DHCP-client crash via unchecked IP packet length

Published Oct 13, 2026 · Updated Oct 13, 2026

Integer underflow in udhcpc in Red Hat Hardened Images allows remote attackers on the same network segment to crash the DHCP client. Raw DHCP processing replaces a validated packet length with the IP header's untrusted length without checking the minimum again, so header subtraction underflows and produces an oversized memory copy. Exploitation requires the raw-packet receive path and same-segment access; the reported consequence is client termination and loss of network connectivity.

CVSS severity6.5
Medium
EPSS probability0.19%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in udhcpc in Red Hat Hardened Images allows remote attackers on the same network segment to crash the DHCP client. Raw DHCP processing replaces a validated packet length with the IP header's untrusted length without checking the minimum again, so header subtraction underflows and produces an oversized memory copy. Exploitation requires the raw-packet receive path and same-segment access; the reported consequence is client termination and loss of network connectivity.

The record

CVE
CVE-2026-88833
Published
Oct 13, 2026
Updated
Oct 13, 2026
Vendor
libuser Project
Product
Red Hat Hardened Images
Classifications
CWE-191, T1499.004
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 13, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 13, 2026Record 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 vectoradjacent
Required privilegesunauthenticated

What is affected?

libuser Project · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

6.5Red HatCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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