CVE-2026-88833
Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service
- State
- Published
- Severity
- 6.5 Medium
- Published
- Oct 13, 2026
- Updated
- Oct 16, 2026
- Reserved
- Sep 10, 2026
Description
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | redhat |
Weaknesses
- CWE-191 Integer Underflow (Wrap or Wraparound)
Affected Products
| Product | Versions |
|---|---|
Red Hat Hardened ImagesRed Hat |
References
- https://access.redhat.com/security/cve/CVE-2026-88833vdb-entry
- RHBZ#2531347issue-tracking
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