Bug 2531347 (CVE-2026-88833) - CVE-2026-88833 busybox: busybox: udhcpc integer underflow in DHCP packet length calculation causes denial of service
Summary: CVE-2026-88833 busybox: busybox: udhcpc integer underflow in DHCP packet leng...
Keywords:
Status: NEW
Alias: CVE-2026-88833
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-10 09:47 UTC by OSIDB Bzimport
Modified: 2026-10-13 13:51 UTC (History)
1 user (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-09-10 09:47:03 UTC 
A vulnerability was found in the BusyBox DHCP client (networking/udhcp/dhcpc.c), specifically in d4_recv_raw_packet(). The function trusts the attacker-controlled IP tot_len field to calculate the payload size. When a malicious DHCP packet is sent with IP tot_len set to 20, the subtraction underflows to a negative value, wraps to a massive unsigned value, and is passed to memcpy(), causing an immediate segfault.

Remote code execution is not practical because the oversized memcpy faults immediately. The attack requires Layer 2 network adjacency.
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