CVE-2026-88833
Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service
CVSS Score
6.5
EPSS Score
0.0%
EPSS Percentile
0th
A flaw was found in BusyBox's udhcpc DHCP client. When processing raw DHCP packets, the client replaces the validated packet length with an attacker-controlled value from the IP header without re-validating the minimum size. This leads to an integer underflow when subtracting header sizes, causing a subsequent memory copy with a massively oversized length. An attacker on the same network segment can send a specially crafted packet to crash the DHCP client, resulting in denial of service and loss of network connectivity.
| CWE | CWE-191 |
| Vendor | red hat |
| Product | red hat hardened images |
| Published | Oct 13, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Hardened Images
All versions affected References
Credits
Red Hat would like to thank Shubham Raj (Causal Security) for reporting this issue.