CVE-2026-19673 Zephyr OS - Out of Bounds Read/Write

Zephyr OS with CONFIG_NET_VLAN=y and VLAN enabled on Ethernet interfaces without hardware VLAN tag stripping contains a buffer length validation flaw in ethernet_recv() caused by improper length checks on VLAN tagged frames, letting remote attackers cause denial of service and out-of-bounds memory access, exploit requires crafted short VLAN tagged Ethernet frames.

CVSS base score 7.1 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Out of Bounds Read/Write
Impact
Denial Of Service, Information Disclosure, Data Tampering
CVSS vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Published
14 October 2026
Updated
15 October 2026
Weakness
CWE-125

Vendor fix

Update to a version that rejects frames with invalid VLAN tag lengths and validates header length against buffer length.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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