Answer in brief
CVE-2026-31682 records a Critical severity (CVSS 9.1) vulnerability in bridge: br_nd_send: linearize skb before parsing ND options. 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-2026-31682 records a Critical severity (CVSS 9.1) vulnerability in bridge: br_nd_send: linearize skb before parsing ND options. 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 9.1. 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 <c68433fd291c9e88c00292095172c62d1997d662 || >=ed842faeb2bd49256f00485402f3113205f91d30 <4f397b950c916e9a1f8a4fce04ea0110206cad47 || >=ed842faeb2bd49256f00485402f3113205f91d30 <bd91ec85aa4c77d645bd2739fc56784157a88ca2 || >=ed842faeb2bd49256f00485402f3113205f91d30 <658261898130da620fc3d0fbb0523efb3366cb55 || >=ed842faeb2bd49256f00485402f3113205f91d30 <2ba4caba423ed94d63006eb1d2227b0332ab7fcd || >=ed842faeb2bd49256f00485402f3113205f91d30 <9c55e41c73af5c4511070933b1bd25248521270c || >=ed842faeb2bd49256f00485402f3113205f91d30 <3a30f6469b058574f49efde61cd6f5d79e576053 || >=ed842faeb2bd49256f00485402f3113205f91d30 <a01aee7cafc575bb82f5529e8734e7052f9b16ea | c68433fd291c9e88c00292095172c62d1997d662, 4f397b950c916e9a1f8a4fce04ea0110206cad47, bd91ec85aa4c77d645bd2739fc56784157a88ca2, 658261898130da620fc3d0fbb0523efb3366cb55, 2ba4caba423ed94d63006eb1d2227b0332ab7fcd, 9c55e41c73af5c4511070933b1bd25248521270c, 3a30f6469b058574f49efde61cd6f5d79e576053, a01aee7cafc575bb82f5529e8734e7052f9b16ea |
| 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
Apr 25, 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: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.
Quoted source text, attributed separately from HOL analysis.
CVSS is 9.1. 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 <c68433fd291c9e88c00292095172c62d1997d662 || >=ed842faeb2bd49256f00485402f3113205f91d30 <4f397b950c916e9a1f8a4fce04ea0110206cad47 || >=ed842faeb2bd49256f00485402f3113205f91d30 <bd91ec85aa4c77d645bd2739fc56784157a88ca2 || >=ed842faeb2bd49256f00485402f3113205f91d30 <658261898130da620fc3d0fbb0523efb3366cb55 || >=ed842faeb2bd49256f00485402f3113205f91d30 <2ba4caba423ed94d63006eb1d2227b0332ab7fcd || >=ed842faeb2bd49256f00485402f3113205f91d30 <9c55e41c73af5c4511070933b1bd25248521270c || >=ed842faeb2bd49256f00485402f3113205f91d30 <3a30f6469b058574f49efde61cd6f5d79e576053 || >=ed842faeb2bd49256f00485402f3113205f91d30 <a01aee7cafc575bb82f5529e8734e7052f9b16ea | c68433fd291c9e88c00292095172c62d1997d662, 4f397b950c916e9a1f8a4fce04ea0110206cad47, bd91ec85aa4c77d645bd2739fc56784157a88ca2, 658261898130da620fc3d0fbb0523efb3366cb55, 2ba4caba423ed94d63006eb1d2227b0332ab7fcd, 9c55e41c73af5c4511070933b1bd25248521270c, 3a30f6469b058574f49efde61cd6f5d79e576053, a01aee7cafc575bb82f5529e8734e7052f9b16ea |
| 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
Apr 25, 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: linearize skb before parsing ND options br_nd_send() parses neighbour discovery options from ns->opt[] and assumes that these options are in the linear part of request. Its callers only guarantee that the ICMPv6 header and target address are available, so the option area can still be non-linear. Parsing ns->opt[] in that case can access data past the linear buffer. Linearize request before option parsing and derive ns from the linear network header.
Quoted source text, attributed separately from HOL analysis.