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  4. CVE 2026 23392 netfilter nftables release flowtable after rcu
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High ยท CVSS 7.8CVE-2026-23392

netfilter: nf_tables: release flowtable after rcu grace period on errorCVE-2026-23392

Answer in brief

CVE-2026-23392 records a High severity (CVSS 7.8) vulnerability in netfilter: nf_tables: release flowtable after rcu grace period on error. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Mar 25, 2026Updated Oct 30, 2026Source checked Nov 4, 2026First seen by HOL Jul 14, 2026Material review Oct 30, 2026
Upstream Advisory

Key facts

Risk
High ยท CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
22 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:4.16:-:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <d2632de96ccb066e0131ad1494241b9c281c60b8 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <adee3436ccd29f1e514c028899e400cbc6d84065 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <7e3955b282eae20d61c75e499c75eade51c20060 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <c8092edb9a11f20f95ccceeb9422b7dd0df337bd || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <e78a2dcc7cfb87b64a631441ca7681492b347ef6 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <d73f4b53aaaea4c95f245e491aa5eeb8a21874ced2632de96ccb066e0131ad1494241b9c281c60b8, adee3436ccd29f1e514c028899e400cbc6d84065, 7e3955b282eae20d61c75e499c75eade51c20060, c8092edb9a11f20f95ccceeb9422b7dd0df337bd, e78a2dcc7cfb87b64a631441ca7681492b347ef6, d73f4b53aaaea4c95f245e491aa5eeb8a21874ce
Linux/Linuxgeneric4.16Not reported
Linux/Linuxgeneric>=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <29538fb3f412f3ce5ad9f97fe7fd84952dacd3af || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <ec0f801e5ce0162fc4fea95607c716b264d283fb || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <d2632de96ccb066e0131ad1494241b9c281c60b8 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <adee3436ccd29f1e514c028899e400cbc6d84065 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <7e3955b282eae20d61c75e499c75eade51c20060 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <c8092edb9a11f20f95ccceeb9422b7dd0df337bd || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <e78a2dcc7cfb87b64a631441ca7681492b347ef6 || >=3b49e2e94e6ebb8b23d0955d9e898254455734f8 <d73f4b53aaaea4c95f245e491aa5eeb8a21874ce29538fb3f412f3ce5ad9f97fe7fd84952dacd3af, ec0f801e5ce0162fc4fea95607c716b264d283fb, d2632de96ccb066e0131ad1494241b9c281c60b8, adee3436ccd29f1e514c028899e400cbc6d84065, 7e3955b282eae20d61c75e499c75eade51c20060, c8092edb9a11f20f95ccceeb9422b7dd0df337bd, e78a2dcc7cfb87b64a631441ca7681492b347ef6, d73f4b53aaaea4c95f245e491aa5eeb8a21874ce
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.5 <**
Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.5 <**
Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric>=V3.1.7 <**
Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric>=0 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.6 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.5 <**
Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric>=V3.1.7 <**

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to d2632de96ccb066e0131ad1494241b9c281c60b8; Linux/Linux to 29538fb3f412f3ce5ad9f97fe7fd84952dacd3af; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP to *; Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to *; Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFP to * if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Mar 25, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 30, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Jul 14, 2026

Sources and claim methodology

  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencecert-portal.siemens.com
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: release flowtable after rcu grace period on error Call synchronize_rcu() after unregistering the hooks from error path, since a hook that already refers to this flowtable can be already registered, exposing this flowtable to packet path and nfnetlink_hook control plane. This error path is rare, it should only happen by reaching the maximum number hooks or by failing to set up to hardware offload, just call synchronize_rcu(). There is a check for already used device hooks by different flowtable that could result in EEXIST at this late stage. The hook parser can be updated to perform this check earlier to this error path really becomes rarely exercised. Uncovered by KASAN reported as use-after-free from nfnetlink_hook path when dumping hooks.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Nov 4, 2026
References
12 linked sources
Open source record