CVE-2025-62525
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-10-22

Last updated on: 2025-10-30

Assigner: GitHub, Inc.

Description
OpenWrt Project is a Linux operating system targeting embedded devices. Prior to version 24.10.4, local users could read and write arbitrary kernel memory using the ioctls of the ltq-ptm driver which is used to drive the datapath of the DSL line. This only effects the lantiq target supporting xrx200, danube and amazon SoCs from Lantiq/Intel/MaxLinear with the DSL in PTM mode. The DSL driver for the VRX518 is not affected. ATM mode is also not affected. Most VDSL lines use PTM mode and most ADSL lines use ATM mode. OpenWrt is normally running as a single user system, but some services are sandboxed. This vulnerability could allow attackers to escape a ujail sandbox or other contains. This is fixed in OpenWrt 24.10.4. There are no workarounds.
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Meta Information
Published
2025-10-22
Last Modified
2025-10-30
Generated
2026-06-16
AI Q&A
2025-10-22
EPSS Evaluated
2026-06-14
NVD
CVE-2025-62525
EUVD
EUVD-2025-35592
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
openwrt openwrt to 24.10.4 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
CWE-20 The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
CWE-125 The product reads data past the end, or before the beginning, of the intended buffer.
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Executive Summary

This vulnerability exists in the ltq-ptm driver used by OpenWrt on certain Lantiq/Intel/MaxLinear SoCs operating DSL lines in PTM mode. It allows local users to read and write arbitrary kernel memory through the driver's ioctl interface due to improper input validation and out-of-bounds memory access. This can lead to privilege escalation and potentially escaping sandboxed environments. [4]

Impact Analysis

An attacker with local access could exploit this vulnerability to read and write kernel memory arbitrarily, leading to privilege escalation. This could allow them to escape sandboxed environments like ujail, potentially gaining higher system privileges and causing high availability impact on the device. [4]

Detection Guidance

This vulnerability affects OpenWrt systems running versions prior to 24.10.4 on Lantiq target devices using the ltq-ptm driver for DSL lines in PTM mode. Detection involves verifying the OpenWrt version and the presence of the vulnerable ltq-ptm driver. You can check the OpenWrt version with the command `cat /etc/openwrt_release` or `opkg list-installed | grep openwrt`. To check if the ltq-ptm driver is loaded, use `lsmod | grep ltq_ptm`. Since the vulnerability involves ioctl calls allowing arbitrary kernel memory read/write, direct detection via commands is limited. Monitoring for unusual kernel memory access or sandbox escapes may help. No specific detection commands are provided in the resources. [4]

Mitigation Strategies

The immediate mitigation step is to upgrade OpenWrt to version 24.10.4 or later, where the vulnerability has been fixed. There are no workarounds available. Ensuring that your device is not running a vulnerable version and applying the official patches or updates is critical. Additionally, limiting local user access to the device can reduce risk, as the vulnerability requires local user privileges. [4]

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