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Review reviewHigh

CVE-2026-31417

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: net/x25: Fix overflow when accumulating packets Add a check to ensure that `x25_sock.fraglen` does not overflow. The `fraglen` also needs to be resetted when purging `fragment_queue` in `x25_clear_queues()`.

CVSS
7.5
EPSS
0.45%
36.9% percentile
CISA KEV
Not listed
Published
2026.04.13
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.45%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net/x25: Fix overflow when accumulating packets Add a check to ensure that `x25_sock.fraglen` does not overflow. The `fraglen` also needs to be resetted when purging `fragment_queue` in `x25_clear_queues()`.

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 < 96fc16370b0bceb289c7e0479bd0540b81e257aa, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 798d613afb64b01a203f448fb0f43c37c6afe79d, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 6e568835ea54a3e1d08e310e34f95d434e739477, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 1734bd85c5e0a7a801295b729efb56b009cb8fc3, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 4e2d1bcef78d21247fe8fef13bc7ed95885df2b5, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 8c92969c197b91c134be27dc3afb64ab468853a9, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f953f11ccf4afe6feb635c08145f4240d9a6b544, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < a1822cb524e89b4cd2cf0b82e484a2335496a6d9, >= 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 < 6.6.134, >= 6.7 < 6.12.81, >= 6.13 < 6.18.22, >= 6.19 < 6.19.12, 2.6.12, 7.0
Fixed versions
5.10.253, 5.15.203, 6.1.168, 6.6.134, 6.12.81, 6.18.22, 6.19.12

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:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
CWE-191
CVE-2026-31417 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW