# CVE-2026-101103: HMS Networks PEAK-System PCAN drivers kernel crash

Source: https://junglewise.ai/threats/cve-2026-109576-hms-networks-peak-system-pcan-windows-drivers  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-10-20. Updated: 2026-10-20  
License: CC BY 4.0 with a link back

CVE-2026-101103 · Severity: high · CVSS 5.5 · Published 2026-10-20

HMS Networks PEAK-System PCAN drivers for Windows CAN devices contain memory corruption flaws that can crash the operating system kernel. An attacker with local access to exploit these vulnerabilities could cause a denial of service, disrupting industrial control systems and connected equipment that rely on CAN communication.

Technologies: [HMS Networks PCAN Windows CAN device drivers](https://junglewise.ai/threats/technologies/pcan-windows-can-device-drivers), [HMS Networks PEAK-System Device Driver Setup](https://junglewise.ai/threats/technologies/peak-system-device-driver-setup). Vendors: [HMS Networks](https://junglewise.ai/threats/vendors/hms-networks).

## Quick answers

**Is CVE-2026-101103 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-101103 being exploited in the wild.

**How severe is CVE-2026-101103?** High severity, with a CVSS score of 5.5, published 20 October 2026.

**Which products and versions are affected?** HMS Networks PCAN Windows CAN device drivers <=5.1.2; HMS Networks PEAK-System Device Driver Setup <=5.1.2.1151.

**Is there a fix for CVE-2026-101103?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-101103 attacked?** It is attacked with local access.

**Am I affected by CVE-2026-101103?** Check whether you run HMS Networks PCAN Windows CAN device drivers or HMS Networks PEAK-System Device Driver Setup at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The PCAN drivers contain multiple memory safety issues including out-of-bounds writes, buffer overflows, array index validation failures, and improper pointer dereference handling. These vulnerabilities reside in the device driver kernel-mode code and can be triggered through crafted I/O control requests or device interactions. Local exploitation leads to kernel crash and denial of service.

## Affected products

- HMS Networks PEAK-System Device Driver Setup <=5.1.2.1151
- HMS Networks PCAN Windows CAN device drivers <=5.1.2

## Identifiers

- CVE-2026-101103
- CVE-2026-109576
- CVE-2026-103672
- CVE-2026-105960
- CVE-2026-110322
- CVE-2026-94188

## Timeline

- 2026-10-20: advisory: CISA ICS Advisory ICSA-26-293-01 published

## Related threats

- [HMS Networks PEAK-System PCAN untrusted pointer dereference](https://junglewise.ai/threats/cve-2026-110322-the-peak-system-pcan-type-0x4030-processing-path-fails-to)
- [HMS Networks PEAK-System PCAN buffer overflow in driver](https://junglewise.ai/threats/cve-2026-105960-peak-system-pcan-contains-a-vulnerable-operation-involving-a)
- [HMS Networks PEAK-System PCAN buffer overflow in DLC parser](https://junglewise.ai/threats/cve-2026-103672-the-peak-system-pcan-parser-indexes-a-length-table-using)
- [HMS Networks PEAK-System PCAN buffer overflow in diagnostic call](https://junglewise.ai/threats/cve-2026-101103-the-peak-system-pcan-diagnostic-call-did-not-validate-that-the)