CVE-2021-3322: Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassembly in Zephyr

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-10-12 · updated 2026-06-17
Weakness: CWE-476

Description

Unexpected Pointer Aliasing in IEEE 802154 Fragment Reassembly in Zephyr. Zephyr versions >= >=2.4.0 contain NULL Pointer Dereference (CWE-476). For more information, see https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3

Affected products

zephyrproject zephyr: from 2.4.0 before 2.5.0 — fixed in 2.5.0

How to fix

Upgrade to a fixed version: zephyrproject zephyr 2.5.0. Check the vendor advisory for mitigations.

References

http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3
http://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-p86r-gc4r-4mq3

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