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CVE-2026-71401— wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read

Quick assessment

Affected
SUSE wicked
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 wicked 的 DHCPv4 数据包捕获代码中发现了一个整数下溢漏洞。 中的 函数在从 IP 总长度字段（ ）中减去 IP 头部长度（ ）之前，未验证 是否至少与 相等或更大。同一网络上的未认证攻击者可以借此在 wicked DHCPv4 客户端（wickedd-dhcp4）中触发对接收缓冲区的越界读取，并可能导致守护进程崩溃（具体取决于进程的内存布局）。目前尚未证实该漏洞会导致信息泄露。此问题影响 wicked 0.6.80 及之前的所有版本。

CVSS 5.3 · Medium

Affected Version Matrix 1

VendorProduct Version RangeStatus
SUSE wicked ≤ 0.6.80 affected
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I. Basic Information for CVE-2026-71401

Vulnerability Information
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Vulnerability Title
wicked: integer underflow of the UDP length in ni_capture_inspect_udp_header() leads to an out-of-bounds read
Source: CVE Program / CVE List V5
Vulnerability Description
An integer underflow was found in the DHCPv4 packet capture code of wicked. ni_capture_inspect_udp_header() in src/capture.c does not verify that the IP total length field (ip_len) is at least as large as the IP header length (ihl) before subtracting the header length. An unauthenticated attacker on the same network can thereby trigger an out-of-bounds read past the receive buffer in the wicked DHCPv4 client (wickedd-dhcp4), which can crash the daemon depending on the process memory layout. No information disclosure has been demonstrated. This issue affects wicked up to and including version 0.6.80.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
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
SUSE wicked 0 ~ 0.6.80 -

II. Public POCs for CVE-2026-71401

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III. Intelligence Information for CVE-2026-71401

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Patches & Fixes for CVE-2026-71401 (1)

Vendor Advisories for CVE-2026-71401 (1)

IV. Related Vulnerabilities

Same product: wicked
Same vendor: SUSE
Same weakness: CWE-191

V. Comments for CVE-2026-71401

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