CVE-2025-39806 remediation guide

Linux Linux, SIMATIC CN 4100, linux kernel

In the Linux kernel, the following vulnerability has been resolved: HID: multitouch: fix slab out-of-bounds access in mt_report_fixup() A malicious HID device can trigger a slab out-of-bounds during mt_report_fixup() by passing in report descriptor smaller than 607 bytes. mt_report_fixup() attempts to patch byte offset 607 of the descriptor with 0x25 by first checking if byte offset 607 is 0x15 however it lacks bounds checks to verify if the descriptor is big enough before conducting this check. Fix this bug by ensuring the descriptor size is at least 608 bytes before accessing it. Below is...

Open CVE record

ProductLinux Linux, SIMATIC CN 4100, linux kernel

Affected versions>= 7d91a0b2151a9c3b61d44c85c8eba930eddd1dd0 < 4263e5851779f7d8ebfbc9cc7d2e9b0217adba8d, >= 45ec9f17ce46417fc4eccecf388c99e81fb7fcc1 < 7ab7311c43ae19c66c53ccd8c5052a9072a4e338, >= 1d5c7d0a49ec9d8786f266ac6d1d7c4960e1787b < d4e6e2680807671e1c73cd6a986b33659ce92f2b, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < 3055309821dd3da92888f88bad10f0324c3c89fe, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < c13e95587583d018cfbcc277df7e02d41902ac5a, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < 0379eb8691b9c4477da0277ae0832036ca4410b4, >= d189e24a42b8bd0ece3d28801d751bf66dba8e92, >= 5.15.168 < 5.15.191, >= 6.1.111 < 6.1.150, >= 6.6.52 < 6.6.104, >= 6.10.11 < 6.11, >= 6.11, < V5.0, >= 6.11.1 < 6.12.45, >= 6.13 < 6.16.5, 6.11, 6.17, 11.0

Fixed versions5.15.191, 6.1.150, 6.6.104, 6.11, 6.12.45, 6.16.5

Priority basisReview · CVSS 7.1 · EPSS 0.22%

Identify the affected asset

Confirm whether Linux Linux, SIMATIC CN 4100, linux kernel is installed, record the deployed version and installation path, and identify exposed interfaces.

Record the product name, package or appliance identifier, and installed version.
Identify internet-facing, administrative, API, and internal access paths.
Preserve the pre-change configuration and relevant service logs.

Validate the affected-version match

Compare the deployed version with the affected range: >= 7d91a0b2151a9c3b61d44c85c8eba930eddd1dd0 < 4263e5851779f7d8ebfbc9cc7d2e9b0217adba8d, >= 45ec9f17ce46417fc4eccecf388c99e81fb7fcc1 < 7ab7311c43ae19c66c53ccd8c5052a9072a4e338, >= 1d5c7d0a49ec9d8786f266ac6d1d7c4960e1787b < d4e6e2680807671e1c73cd6a986b33659ce92f2b, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < 3055309821dd3da92888f88bad10f0324c3c89fe, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < c13e95587583d018cfbcc277df7e02d41902ac5a, >= c8000deb68365b461b324d68c7ea89d730f0bb85 < 0379eb8691b9c4477da0277ae0832036ca4410b4, >= d189e24a42b8bd0ece3d28801d751bf66dba8e92, >= 5.15.168 < 5.15.191, >= 6.1.111 < 6.1.150, >= 6.6.52 < 6.6.104, >= 6.10.11 < 6.11, >= 6.11, < V5.0, >= 6.11.1 < 6.12.45, >= 6.13 < 6.16.5, 6.11, 6.17, 11.0. Treat incomplete inventory results as unresolved.

Prioritize with independent signals

The CVSS severity warrants an early asset and exposure review. Combine this signal with asset criticality, exposure, compensating controls, and business impact.

Apply supported remediation

Follow the vendor advisory or supported update path. Current fixed-version status: 5.15.191, 6.1.150, 6.6.104, 6.11, 6.12.45, 6.16.5. Preserve configuration and rollback material before change.

Verify the result

Confirm the resulting version, service health, authentication and access paths, monitoring coverage, and relevant security logs.

Confirm the expected version and package state.
Run a functional health check for critical service paths.
Review authentication, error, application, and security monitoring logs.
Reassess exposure if the supported fix cannot be applied.

Operational boundary

This page does not replace the vendor advisory, support contract, change-management process, or recovery plan. Do not infer that an asset is unaffected from an incomplete inventory query or a missing fixed-version field.