CVE-2026-111734

Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()

Published Oct 29, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed
Description
P-Net before 1.0.3 does not validate the length of a received Ethernet frame in pf_eth_recv() before reading the EtherType, any VLAN tags and the PROFINET FrameID. The VLAN tag loop had no upper bound, so a truncated frame, or a frame consisting only of VLAN tags, makes the function read past the end of the receive buffer. This can cause a crash (denial of service) or disclose memory content.

Remediation

Vendor Solution

Upgrade to P-Net 1.0.3 or later.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Rt-labs
Rt-labs p-net
Vendors & Products Rt-labs
Rt-labs p-net
Type Values Removed Values Added
Description P-Net before 1.0.3 does not validate the length of a received Ethernet frame in pf_eth_recv() before reading the EtherType, any VLAN tags and the PROFINET FrameID. The VLAN tag loop had no upper bound, so a truncated frame, or a frame consisting only of VLAN tags, makes the function read past the end of the receive buffer. This can cause a crash (denial of service) or disclose memory content.
Title Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()
Weaknesses CWE-125
References
Metrics cvssV4_0

{'score': 7.1, 'vector': 'CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
rt-labs
Published
Updated
Nov 5, 2026, 9:22 PM
Reserved
Oct 16, 2026, 3:50 PM
Status
Deferred
Published
Oct 29, 2026, 4:17 PM
Modified
Nov 5, 2026, 10:17 PM