CVE-2025-62525

Local privilege escalation via unsafe ltq-ptm ioctls

Published Oct 22, 2025 · Updated Oct 22, 2025

Kernel memory corruption in OpenWrt before 24.10.4 allows local users to read and write arbitrary kernel memory through ltq-ptm ioctls. The ptm_ioctl handlers dereference user-supplied pointers directly instead of using copy_to_user and copy_from_user, and they omit a CAP_NET_ADMIN check. Reachability is limited to Lantiq xrx200, danube, and amazon SoCs using DSL in PTM mode; it permits ujail sandbox escape, while VRX518 and ATM mode are unaffected.

CVSS severity7.9
High
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Kernel memory corruption in OpenWrt before 24.10.4 allows local users to read and write arbitrary kernel memory through ltq-ptm ioctls. The ptm_ioctl handlers dereference user-supplied pointers directly instead of using copy_to_user and copy_from_user, and they omit a CAP_NET_ADMIN check. Reachability is limited to Lantiq xrx200, danube, and amazon SoCs using DSL in PTM mode; it permits ujail sandbox escape, while VRX518 and ATM mode are unaffected.

The record

CVE
CVE-2025-62525
Published
Oct 22, 2025
Updated
Oct 22, 2025
Vendor
OpenWrt
Product
OpenWrt
Classifications
CWE-125, CWE-787, CWE-20, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 22, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 24.10.4

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

OpenWrt · OpenWrtversion=< 24.10.4

Published CVSS scores

8.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
7.9GitHub, Inc.CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
CWE-787Out-of-bounds Write
CWE-20Improper Input Validation
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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