Answer in brief
CVE-2026-31418 records a Medium severity (CVSS 5.5) vulnerability in netfilter: ipset: drop logically empty buckets in mtype_del. 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-2026-31418 records a Medium severity (CVSS 5.5) vulnerability in netfilter: ipset: drop logically empty buckets in mtype_del. 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 5.5. 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 | >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <c098ff857e7ca923539164af5b3c2fe3e8f8afaf || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <58f3a14826d4e6b0d5421f1a64be280b48601ea2 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <6cea34d7ec6829b62f521a37a287f670144a2233 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <b7eef00f08b92b0b9efe8ae0df6d0005e6199323 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ceacaa76f221a6577aba945bb8873c2e640aeba4 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <9862ef9ab0a116c6dca98842aab7de13a252ae02 || 6c717726f341fd8f39a3ec2dcf5d98d9d28a2769 || d2997d64dfa65082236bca1efd596b6c935daf5e || >=5.4.24 <5.5 || >=5.5.8 <5.6 | c098ff857e7ca923539164af5b3c2fe3e8f8afaf, 58f3a14826d4e6b0d5421f1a64be280b48601ea2, ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb, 6cea34d7ec6829b62f521a37a287f670144a2233, b7eef00f08b92b0b9efe8ae0df6d0005e6199323, 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4, ceacaa76f221a6577aba945bb8873c2e640aeba4, 9862ef9ab0a116c6dca98842aab7de13a252ae02, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | 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: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.
Quoted source text, attributed separately from HOL analysis.
CVSS is 5.5. 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 | >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <c098ff857e7ca923539164af5b3c2fe3e8f8afaf || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <58f3a14826d4e6b0d5421f1a64be280b48601ea2 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <6cea34d7ec6829b62f521a37a287f670144a2233 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <b7eef00f08b92b0b9efe8ae0df6d0005e6199323 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <ceacaa76f221a6577aba945bb8873c2e640aeba4 || >=8af1c6fbd9239877998c7f5a591cb2c88d41fb66 <9862ef9ab0a116c6dca98842aab7de13a252ae02 || 6c717726f341fd8f39a3ec2dcf5d98d9d28a2769 || d2997d64dfa65082236bca1efd596b6c935daf5e || >=5.4.24 <5.5 || >=5.5.8 <5.6 | c098ff857e7ca923539164af5b3c2fe3e8f8afaf, 58f3a14826d4e6b0d5421f1a64be280b48601ea2, ad92ee87462f9a3061361d392e9dbfe2e5c1c9fb, 6cea34d7ec6829b62f521a37a287f670144a2233, b7eef00f08b92b0b9efe8ae0df6d0005e6199323, 68ca0eea0af02bed36c5e2c13e9fa1647c31a7d4, ceacaa76f221a6577aba945bb8873c2e640aeba4, 9862ef9ab0a116c6dca98842aab7de13a252ae02, 5.5, 5.6 |
| Linux/Linuxgeneric | 5.6 | 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: ipset: drop logically empty buckets in mtype_del mtype_del() counts empty slots below n->pos in k, but it only drops the bucket when both n->pos and k are zero. This misses buckets whose live entries have all been removed while n->pos still points past deleted slots. Treat a bucket as empty when all positions below n->pos are unused and release it directly instead of shrinking it further.
Quoted source text, attributed separately from HOL analysis.