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CVE-2026-111734— Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()

Quick assessment

Affected
RT-Labs P-Net
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 1.0.3 之前的 P-Net 版本中， 函数在读取 EtherType、任何 VLAN 标签以及 PROFINET FrameID 之前，未对接收到的以太网帧长度进行验证。由于 VLAN 标签循环缺乏上限，当接收到截断的帧或仅由 VLAN 标签组成的帧时，该函数会读取超出接收缓冲区末尾的数据。这可能导致系统崩溃（拒绝服务）或泄露内存内容。

CVSS 7.1 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
RT-Labs P-Net < 1.0.3 affected
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I. Basic Information for CVE-2026-111734

Vulnerability Information
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Vulnerability Title
Missing length validation of EtherType, VLAN and FrameID fields in pf_eth_recv()
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
RT-Labs P-Net 0 ~ 1.0.3 -

II. Public POCs for CVE-2026-111734

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III. Intelligence Information for CVE-2026-111734

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Other References for CVE-2026-111734 (1)

Same Patch Batch · RT-Labs · 2026-10-29 · 11 CVEs total

CVE-2026-111732 9.3 CRITICAL Out-of-bounds write when parsing AR Vendor Block requests
CVE-2026-111733 8.7 HIGH NULL pointer dereference on implicit read of AR specific record index
CVE-2026-111736 8.7 HIGH NULL pointer dereference on implicit read of user specific record index
CVE-2026-111731 8.7 HIGH Infinite loop when reading PDPortDataCheck record of subslot 0
CVE-2026-112200 8.7 HIGH Resource exhaustion from unreleased AR and RPC session on RPC requests with incorrect endi
CVE-2026-115793 8.7 HIGH Resource exhaustion from RPC sessions kept for requests to unknown interface
CVE-2026-111730 7.2 HIGH Out-of-bounds write in CheckPeers block parser due to unvalidated peer station name length
CVE-2026-111735 7.1 HIGH Integer underflow leads to out-of-bounds read in pf_cpm_c_data_ind()
CVE-2026-115795 5.3 MEDIUM Out-of-bounds read of DCP block header in DCP Set and Identify request parsing
CVE-2026-115794 2.3 LOW Alarm data length not validated against received frame length

IV. Related Vulnerabilities

Same product: P-Net
Same vendor: RT-Labs
Same weakness: CWE-125