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Review reviewHigh

CVE-2025-39806

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...

CVSS
7.1
EPSS
0.22%
12.2% percentile
CISA KEV
Not listed
Published
2025.09.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.22%
Technical severityCVSS 7.1

Vulnerability overview

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...

Affected product and versions

Product
Linux 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 versions
5.15.191, 6.1.150, 6.6.104, 6.11, 6.12.45, 6.16.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC CN 4100, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125