CVE-2026-74603
Received Received - Intake

Buffer Over-Read in Linux Kernel PTP OCP Driver

Publication date: 2026-08-22

Last updated on: 2026-08-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: ptp: ocp: Fix board ID over-read The EEPROM board ID is a fixed 13-byte field and is not guaranteed to contain a NUL terminator. Passing it directly to devlink_info_version_fixed_put() treats it as a C string and may read beyond the field. Format at most OCP_BOARD_ID_LEN bytes into the existing local buffer before reporting the ID. Use a precision limit because the snprintf() output size alone does not bound the source string scan.

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Meta Information

Published
2026-08-22
Last Modified
2026-08-22
Generated
2026-08-22
AI Q&A
2026-08-22
EPSS Evaluated
N/A
NVD
CVE-2026-74603
EUVD
EUVD-2026-64540

Affected Vendors & Products

Currently, no data is known.

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Exploitability

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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves an over-read issue in the PTP OCP driver. The EEPROM board ID is a fixed 13-byte field without guaranteed NUL termination. When passed to devlink_info_version_fixed_put(), it is treated as a C string, potentially reading beyond the 13-byte limit and causing memory access issues.

Detection Guidance

This vulnerability is specific to the Linux kernel's PTP OCP driver and involves an over-read of the EEPROM board ID. Detection requires checking the kernel version and the presence of the affected driver. Use commands like 'uname -a' to check the kernel version and 'lsmod | grep ptp_ocp' to verify if the driver is loaded.

Impact Analysis

This vulnerability could lead to memory corruption or crashes in systems using the affected Linux kernel component. It may cause instability or denial of service if exploited maliciously or triggered by specific hardware configurations.

Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If the ptp_ocp driver is not in use, consider unloading it with 'rmmod ptp_ocp' to prevent potential exploitation.

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