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Review reviewHigh

CVE-2025-40135

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.

CVSS
8.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.11.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 8.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < f0a54d00d2f36de40266f47c27989853e8588656, >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < f69fec6287565fdeb61f65e700a1184352306943, >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < bd0905e2122e3680968cd0741966983490bf2ed3, >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < f7f9e924f23684b4b23cd9f976cceab24a968e34, >= 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 < 9085e56501d93af9f2d7bd16f7fcfacdde47b99c, >= 4.13, >= V3.1.6, >= V3.1.5
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP 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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available