CVE-2026-88833 — Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service
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…
Published: 2026-10-13 · CVSS: 6.5 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7