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CVE-2026-13351— net: Maliciously fragmented IPv6 packets can prevent receiving/processing future incoming packets

Quick assessment

Affected
zephyrproject-rtos Zephyr
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.

Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 4.3及之前版本存在资源管理错误漏洞，该漏洞源于IPv6网络栈处理片段标头时未释放RX网络数据包缓冲区，可能导致通过发送少量恶意碎片化的IPv6数据包耗尽所有RX缓冲槽，导致设备停止接收流量，造成拒绝服务。

CVSS 7.5 · High EPSS 0.49% · P40

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject-rtos Zephyr *≤ 4.3 affected
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I. Basic Information for CVE-2026-13351

Vulnerability Information
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Vulnerability Title
net: Maliciously fragmented IPv6 packets can prevent receiving/processing future incoming packets
Source: CVE Program / CVE List V5
Vulnerability Description
Zephyr's IPv6 network stack can be prevented from receiving or processing future incoming packets by sending a small number of maliciously fragmented IPv6 packets. When such a packet is handled by the fragment-header processing path, the associated RX network packet buffer (allocated from a memory slab) is not released back to the pool. Repeating the malicious packet exhausts all RX buffer slots, after which the device can no longer obtain RX buffers and stops receiving traffic, resulting in a denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 4.3及之前版本存在资源管理错误漏洞，该漏洞源于IPv6网络栈处理片段标头时未释放RX网络数据包缓冲区，可能导致通过发送少量恶意碎片化的IPv6数据包耗尽所有RX缓冲槽，导致设备停止接收流量，造成拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject-rtos Zephyr * ~ 4.3 -

II. Public POCs for CVE-2026-13351

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III. Intelligence Information for CVE-2026-13351

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Vendor Advisories for CVE-2026-13351 (1)

IV. Related Vulnerabilities

Same product: Zephyr
Same vendor: zephyrproject-rtos
Same weakness: CWE-772

V. Comments for CVE-2026-13351

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