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CVE-2026-88833— Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service

Quick assessment

Affected
Red Hat Red Hat Hardened Images
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 BusyBox 的 udhcpc DHCP 客户端中发现了一个漏洞。当处理原始 DHCP 数据包时，该客户端会用攻击者从 IP 头部控制的数据包长度值替换经过验证的数据包长度，而不再重新验证最小尺寸限制。这会导致在减去头部大小时发生整数下溢（underflow），从而引发后续使用极大长度值的内存拷贝操作。同一网段上的攻击者可以发送特制的恶意数据包，导致 DHCP 客户端崩溃，进而引发拒绝服务（DoS）并造成网络连接丢失。

CVSS 6.5 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
Red Hat Red Hat Hardened Images any affected
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I. Basic Information for CVE-2026-88833

Vulnerability Information
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Vulnerability Title
Busybox: busybox: udhcpc integer underflow in dhcp packet length calculation causes denial of service
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
整数下溢(超界折返)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat Hardened Images - cpe:/a:redhat:hummingbird:1

II. Public POCs for CVE-2026-88833

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III. Intelligence Information for CVE-2026-88833

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Vendor Advisories for CVE-2026-88833 (2)

Same Patch Batch · Red Hat · 2026-10-13 · 9 CVEs total

CVE-2026-109832 7.5 HIGH Gnome-remote-desktop: busy-wait dos in vnc tls i/o handlers (gnutls_e_again / gnutls_e_int
CVE-2026-109833 5.9 MEDIUM Gnome-remote-desktop: heap buffer overflow in gnome-remote-desktop vnc tls peek buffer han
CVE-2026-105460 5.5 MEDIUM Bluez: bluez: stack-based out-of-bounds read in btmon via unvalidated num_keys in return_l
CVE-2026-88838 5.5 MEDIUM Busybox: busybox: non-root mount option filter bypass allows clearing fstab security restr
CVE-2026-109976 4.7 MEDIUM Clevis: clevis: integer underflow in pkcs#11 data socket handler crashes daemon on unbound
CVE-2026-88834 3.7 LOW Busybox: busybox: httpd user existence oracle in non-default shadow-disabled builds
CVE-2026-110036 3.3 LOW Device-mapper-persistent-data: device-mapper-persistent-data: denial of service via crafte
CVE-2026-109854 2.5 LOW M17n-lib: uninitialized stack read in iso-2022 compound text utf-8 decoding

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-191

V. Comments for CVE-2026-88833

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