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Review reviewHigh

CVE-2026-23231

Linux Linux, RUGGEDCOM RST2428P, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be w...

CVSS
7.8
EPSS
0.79%
52.7% percentile
CISA KEV
Not listed
Published
2026.03.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.79%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: fix use-after-free in nf_tables_addchain() nf_tables_addchain() publishes the chain to table->chains via list_add_tail_rcu() (in nft_chain_add()) before registering hooks. If nf_tables_register_hook() then fails, the error path calls nft_chain_del() (list_del_rcu()) followed by nf_tables_chain_destroy() with no RCU grace period in between. This creates two use-after-free conditions: 1) Control-plane: nf_tables_dump_chains() traverses table->chains under rcu_read_lock(). A concurrent dump can still be w...

Affected product and versions

Product
Linux Linux, RUGGEDCOM RST2428P, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Affected versions
>= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2a6586ecfa4ce1413daaafee250d2590e05f1a33, >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 7017745068a9068904e1e7a1b170a5785647cc81, >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < f3fe58ce37926a10115ede527d59b91bcc05400a, >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < dbd0af8083dd201f07c49110b2ee93710abdff28, >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 2f9a4ffeb763aec822f8ff3d1e82202d27d46d4b, >= 91c7b38dc9f0de4f7f444b796d14476bc12df7bc < 71e99ee20fc3f662555118cf1159443250647533, >= 3.16, < V4.0, >= V3.1.6, >= V3.1.5, >= 3.16 < 6.1.165, >= 6.2 < 6.6.128, >= 6.7 < 6.12.75, >= 6.13 < 6.18.14, >= 6.19 < 6.19.4
Fixed versions
6.1.165, 6.6.128, 6.12.75, 6.18.14, 6.19.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, RUGGEDCOM RST2428P, SIMATIC S7-1500 CPU 1518-4 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
CVE-2026-23231 — Linux Linux, RUGGEDCOM RST2428P, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | SECUFOCUS NOW