zephyrproject-rtos Zephyr up to 4.3 Network Packet release of resource

Summaryinfo

A vulnerability has been found in zephyrproject-rtos Zephyr up to 4.3 and classified as critical. Affected by this issue is some unknown functionality of the component Network Packet Handler. This manipulation causes release of resource. This vulnerability is tracked as CVE-2026-13351. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in zephyrproject-rtos Zephyr up to 4.3. It has been declared as critical. Affected by this vulnerability is an unknown part of the component Network Packet Handler. The manipulation with an unknown input leads to a release of resource vulnerability. The CWE definition for the vulnerability is CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. As an impact it is known to affect availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is known as CVE-2026-13351 since 06/25/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Project Management Software

Vendor

• zephyrproject-rtos

Name

• Zephyr

Version

• 4.0
• 4.1
• 4.2
• 4.3

License

• open-source

Website

• Product: https://github.com/zephyrproject-rtos/zephyr/

CPE 2.3info

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CPE 2.2info

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