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Review reviewHigh

CVE-2026-31674

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: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

CVSS
7.1
EPSS
0.12%
2.45% percentile
CISA KEV
Not listed
Published
2026.04.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check() Reject rt match rules whose addrnr exceeds IP6T_RT_HOPS. rt_mt6() expects addrnr to stay within the bounds of rtinfo->addrs[]. Validate addrnr during rule installation so malformed rules are rejected before the match logic can use an out-of-range value.

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
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 13e3e30ed3b5b67cc1db2bd58a5d09b0f07debfa, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < af9b7e2b765966457f4ec23be5bd34a141f89574, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 29ea965a1353bc8303877422f79c8211e9ba9c55, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < c6a503a9f4debc654e3a6a7ca1f7fce6a9953c59, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < ded71f5684df16fa645cca5bf4fe6b0cd8a46119, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d8795fde1f78669a87c87ac29fceab2f104daa8c, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a28ebf6f99de270d6338ccdc3b49f3e818f99b7b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 9d3f027327c2fa265f7f85ead41294792c3296ed, >= 2.6.12, >= V3.1.6, >= V3.1.5, >= 2.6.12.1 < 5.10.253, >= 5.11 < 5.15.203, >= 5.16 < 6.1.168, >= 6.2 < 6.6.131, >= 6.7 < 6.12.80, >= 6.13 < 6.18.21, >= 6.19 < 6.19.11, 2.6.12, 7.0
Fixed versions
5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
Not available
CVE-2026-31674 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW