Answer in brief
CVE-2026-31752 records a Medium severity (CVSS 5.5) vulnerability in bridge: br_nd_send: validate ND option lengths. 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-2026-31752 records a Medium severity (CVSS 5.5) vulnerability in bridge: br_nd_send: validate ND option lengths. 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 | >=ed842faeb2bd49256f00485402f3113205f91d30 <82a42eceec7c6bdb0e0da94c0542a173b7ea57f2 || >=ed842faeb2bd49256f00485402f3113205f91d30 <259466f76f5a2148aff11134e68f4b4c6d52725b || >=ed842faeb2bd49256f00485402f3113205f91d30 <ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a || >=ed842faeb2bd49256f00485402f3113205f91d30 <e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa || >=ed842faeb2bd49256f00485402f3113205f91d30 <c49b9256bbacb6a135654aebd12e4c0e87166b7c || >=ed842faeb2bd49256f00485402f3113205f91d30 <837392a38445729c22e03d3abcf33f07763efd85 || >=ed842faeb2bd49256f00485402f3113205f91d30 <e71303a9190496136e240c4f2872b7b0b16027a7 || >=ed842faeb2bd49256f00485402f3113205f91d30 <850837965af15707fd3142c1cf3c5bfaf022299b | 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2, 259466f76f5a2148aff11134e68f4b4c6d52725b, ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a, e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa, c49b9256bbacb6a135654aebd12e4c0e87166b7c, 837392a38445729c22e03d3abcf33f07763efd85, e71303a9190496136e240c4f2872b7b0b16027a7, 850837965af15707fd3142c1cf3c5bfaf022299b |
| Linux/Linuxgeneric | 4.15 | 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
May 1, 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: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.
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 | >=ed842faeb2bd49256f00485402f3113205f91d30 <82a42eceec7c6bdb0e0da94c0542a173b7ea57f2 || >=ed842faeb2bd49256f00485402f3113205f91d30 <259466f76f5a2148aff11134e68f4b4c6d52725b || >=ed842faeb2bd49256f00485402f3113205f91d30 <ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a || >=ed842faeb2bd49256f00485402f3113205f91d30 <e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa || >=ed842faeb2bd49256f00485402f3113205f91d30 <c49b9256bbacb6a135654aebd12e4c0e87166b7c || >=ed842faeb2bd49256f00485402f3113205f91d30 <837392a38445729c22e03d3abcf33f07763efd85 || >=ed842faeb2bd49256f00485402f3113205f91d30 <e71303a9190496136e240c4f2872b7b0b16027a7 || >=ed842faeb2bd49256f00485402f3113205f91d30 <850837965af15707fd3142c1cf3c5bfaf022299b | 82a42eceec7c6bdb0e0da94c0542a173b7ea57f2, 259466f76f5a2148aff11134e68f4b4c6d52725b, ee02d8991fd7bd86ed6ebd0deb4aab53feb0e43a, e0bfd6d4dc77ab345b6c65eef0cfe9b2f69085aa, c49b9256bbacb6a135654aebd12e4c0e87166b7c, 837392a38445729c22e03d3abcf33f07763efd85, e71303a9190496136e240c4f2872b7b0b16027a7, 850837965af15707fd3142c1cf3c5bfaf022299b |
| Linux/Linuxgeneric | 4.15 | 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
May 1, 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: bridge: br_nd_send: validate ND option lengths br_nd_send() walks ND options according to option-provided lengths. A malformed option can make the parser advance beyond the computed option span or use a too-short source LLADDR option payload. Validate option lengths against the remaining NS option area before advancing, and only read source LLADDR when the option is large enough for an Ethernet address.
Quoted source text, attributed separately from HOL analysis.