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Review reviewHigh

CVE-2026-31403

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: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The /proc/fs/nfs/exports proc entry is created at module init and persists for the module's lifetime. exports_proc_open() captures the caller's current network namespace and stores its svc_export_cache in seq->private, but takes no reference on the namespace. If the namespace is subsequently torn down (e.g. container destruction after the opener does setns() to a different namespace), nfsd_net_exit() calls nfsd_export_shutdown() which frees the cache. Subs...

CVSS
7.8
EPSS
0.13%
2.60% percentile
CISA KEV
Not listed
Published
2026.04.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: NFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd The /proc/fs/nfs/exports proc entry is created at module init and persists for the module's lifetime. exports_proc_open() captures the caller's current network namespace and stores its svc_export_cache in seq->private, but takes no reference on the namespace. If the namespace is subsequently torn down (e.g. container destruction after the opener does setns() to a different namespace), nfsd_net_exit() calls nfsd_export_shutdown() which frees the cache. Subs...

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
>= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < 76740c28050dc6db2f5550f1325b00a11bbb3255, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < c7f406fb341d6747634b8b1fa5461656e5e56076, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < d1a19217995df9c7e4118f5a2820c5032fef2945, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < e3d77f935639e6ae4b381c80464c31df998d61f4, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < db4a9f99b12a7ee1c19d86c83a3b752c7effa6c6, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < 6a8d70e2ad6aad2c345a5048edcb8168036f97d6, >= 96d851c4d28de8cc83fe2bd5c6bc2eb8f253a6c5 < e7fcf179b82d3a3730fd8615da01b087cc654d0b, >= 3.9, >= V3.1.6, >= V3.1.5, >= 3.9 < 5.10.253, >= 5.11 < 6.1.167, >= 6.2 < 6.6.130, >= 6.7 < 6.12.78, >= 6.13 < 6.18.20, >= 6.19 < 6.19.10, 7.0
Fixed versions
5.10.253, 6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10

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:H/A:H
CWE
Not available