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Review reviewHigh

CVE-2026-23351

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: nft_set_pipapo: split gc into unlink and reclaim phase Yiming Qian reports Use-after-free in the pipapo set type: Under a large number of expired elements, commit-time GC can run for a very long time in a non-preemptible context, triggering soft lockup warnings and RCU stall reports (local denial of service). We must split GC in an unlink and a reclaim phase. We cannot queue elements for freeing until pointers have been swapped. Expired elements are still exposed to both the packet path and userspace dumpers via...

CVSS
7.8
EPSS
0.13%
2.58% percentile
CISA KEV
Not listed
Published
2026.03.25
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: netfilter: nft_set_pipapo: split gc into unlink and reclaim phase Yiming Qian reports Use-after-free in the pipapo set type: Under a large number of expired elements, commit-time GC can run for a very long time in a non-preemptible context, triggering soft lockup warnings and RCU stall reports (local denial of service). We must split GC in an unlink and a reclaim phase. We cannot queue elements for freeing until pointers have been swapped. Expired elements are still exposed to both the packet path and userspace dumpers via...

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
>= 3c4287f62044a90e73a561aa05fc46e62da173da < 65ca51b9fb85477ab92a04295aed34b38f7c062e, >= 3c4287f62044a90e73a561aa05fc46e62da173da < c0f1f85097ac2b6e7d750fe4d05807985cd3fd3a, >= 3c4287f62044a90e73a561aa05fc46e62da173da < 16f3595c0441d87dfa005c47d8f95be213afaa9e, >= 3c4287f62044a90e73a561aa05fc46e62da173da < 7864c667aed01a58b87ca518a631322cd0ac34c0, >= 3c4287f62044a90e73a561aa05fc46e62da173da < c12d570d71920903a1a0468b7d13b085203d0c93, >= 3c4287f62044a90e73a561aa05fc46e62da173da < 500a50a301ce962b019ab95053ac70264fec2c21, >= 3c4287f62044a90e73a561aa05fc46e62da173da < aff13667708dfa0dce136b8efd81baa9fa6ef261, >= 3c4287f62044a90e73a561aa05fc46e62da173da < 9df95785d3d8302f7c066050117b04cd3c2048c2, >= 5.6, >= V3.1.6, >= V3.1.5, >= 5.6.1 < 5.10.253, >= 5.11 < 5.15.203, >= 5.16 < 6.1.167, >= 6.2 < 6.6.130, >= 6.7 < 6.12.77, >= 6.13 < 6.18.17, >= 6.19 < 6.19.7, 5.6, 7.0
Fixed versions
5.10.253, 5.15.203, 6.1.167, 6.6.130, 6.12.77, 6.18.17, 6.19.7

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
CWE-416