Answer in brief
CVE-2026-31414 records a Critical severity (CVSS 9.8) vulnerability in netfilter: nf_conntrack_expect: use expect->helper. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (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.
Answer in brief
CVE-2026-31414 records a Critical severity (CVSS 9.8) vulnerability in netfilter: nf_conntrack_expect: use expect->helper. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (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.
CVSS is 9.8. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <e7ccaa0a62a8ff2be5d521299ce79390c318d306 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <4bd1b3d839172724b33d8d02c5a4ff6a1c775417 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <b53294bff19e56ada2f230ceb8b1ffde61cc3817 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <3dfd3f7712b5a800f2ba632179e9b738076a51f0 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <f01794106042ee27e54af6fdf5b319a2fe3df94d | 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781, e7ccaa0a62a8ff2be5d521299ce79390c318d306, 4bd1b3d839172724b33d8d02c5a4ff6a1c775417, b53294bff19e56ada2f230ceb8b1ffde61cc3817, 3dfd3f7712b5a800f2ba632179e9b738076a51f0, f01794106042ee27e54af6fdf5b319a2fe3df94d |
| Linux/Linuxgeneric | 2.6.30 | Not reported |
| 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 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| 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 <* | * |
Published upstream
Apr 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.8. 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.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic), Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <e7ccaa0a62a8ff2be5d521299ce79390c318d306 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <4bd1b3d839172724b33d8d02c5a4ff6a1c775417 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <b53294bff19e56ada2f230ceb8b1ffde61cc3817 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <3dfd3f7712b5a800f2ba632179e9b738076a51f0 || >=ea781f197d6a835cbb93a0bf88ee1696296ed8aa <f01794106042ee27e54af6fdf5b319a2fe3df94d | 847cb7fe26c5ce5dce0d1a41fac1ea488b7f1781, e7ccaa0a62a8ff2be5d521299ce79390c318d306, 4bd1b3d839172724b33d8d02c5a4ff6a1c775417, b53294bff19e56ada2f230ceb8b1ffde61cc3817, 3dfd3f7712b5a800f2ba632179e9b738076a51f0, f01794106042ee27e54af6fdf5b319a2fe3df94d |
| Linux/Linuxgeneric | 2.6.30 | Not reported |
| 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 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| 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 <* | * |
Published upstream
Apr 13, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jul 14, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_conntrack_expect: use expect->helper Use expect->helper in ctnetlink and /proc to dump the helper name. Using nfct_help() without holding a reference to the master conntrack is unsafe. Use exp->master->helper in ctnetlink path if userspace does not provide an explicit helper when creating an expectation to retain the existing behaviour. The ctnetlink expectation path holds the reference on the master conntrack and nf_conntrack_expect lock and the nfnetlink glue path refers to the master ct that is attached to the skb.
Quoted source text, attributed separately from HOL analysis.