Zephyr
CVE-2026-1679
HIGH
Severity by source
AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H
Lifecycle Timeline
2DescriptionCVE.org
The eswifi socket offload driver copies user-provided payloads into a fixed buffer without checking available space; oversized sends overflow eswifi->buf, corrupting kernel memory (CWE-120). Exploit requires local code that can call the socket send API; no remote attacker can reach it directly.
AnalysisAI
Buffer overflow in Zephyr RTOS eswifi socket offload driver allows authenticated local attackers to corrupt kernel memory through oversized socket send operations. The vulnerability enables privilege escalation and denial of service via heap corruption, with high integrity and availability impact. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Local attacker with low-privilege user access to a system running the eswifi socket offload driver. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate despite the 7.3 CVSS score. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker with low-privileged local access to a Zephyr RTOS device running the eswifi driver crafts a malicious application that invokes the socket send() API with a payload exceeding the fixed eswifi->buf allocation. The oversized data triggers a buffer overflow, overwriting adjacent kernel memory structures such as function pointers, task control blocks, or heap metadata. … |
| Remediation | Apply the vendor-released patch from the Zephyr Project by upgrading to the fixed version specified in GitHub security advisory GHSA-qx3g-5g22-fq5w at https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-qx3g-5g22-fq5w. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Inventory all Zephyr RTOS deployments using eswifi socket offload functionality and assess exposure to authenticated local users. …
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Buffer overflow in Zephyr RTOS dns_unpack_name() function causing OOB writes. PoC available.
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Same weakness CWE-120 – Classic Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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