Answer in brief
CVE-2026-43085 records a Unknown severity vulnerability in netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator. 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 1518F-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.
A CVSS score is not reported in the current record. 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 1518F-4 PN/DP MFP (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <296f18e1c3a87c915a92ed27832d5040a22d1072 || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <9e2182865de781c41ab16b7985e9d26dcefea867 || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <57cc509d82b46150a11dcecc8b25eaa177eda34d || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <368c22aea490f6f50df831b4f9e3623787686c5b || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <d1399632ba255d2e02c757af5d9f5d9279ce168c || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <d552bcfca323d175664d7444989b04f55666978a || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <15d209bccf9273b4a8b4e579ba0e92d065b6ec8c || >=29c5d4afba51c71cfeadd3f74f3c42e064483fb0 <1f3083aec8836213da441270cdb1ab612dd82cf4 | 296f18e1c3a87c915a92ed27832d5040a22d1072, 9e2182865de781c41ab16b7985e9d26dcefea867, 57cc509d82b46150a11dcecc8b25eaa177eda34d, 368c22aea490f6f50df831b4f9e3623787686c5b, d1399632ba255d2e02c757af5d9f5d9279ce168c, d552bcfca323d175664d7444989b04f55666978a, 15d209bccf9273b4a8b4e579ba0e92d065b6ec8c, 1f3083aec8836213da441270cdb1ab612dd82cf4 |
| Linux/Linuxgeneric | 2.6.23 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.6 <* | * |
Published upstream
May 6, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 8, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 8, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_log: initialize nfgenmsg in NLMSG_DONE terminator When batching multiple NFLOG messages (inst->qlen > 1), __nfulnl_send() appends an NLMSG_DONE terminator with sizeof(struct nfgenmsg) payload via nlmsg_put(), but never initializes the nfgenmsg bytes. The nlmsg_put() helper only zeroes alignment padding after the payload, not the payload itself, so four bytes of stale kernel heap data are leaked to userspace in the NLMSG_DONE message body. Use nfnl_msg_put() to build the NLMSG_DONE terminator, which initializes the nfgenmsg payload via nfnl_fill_hdr(), consistent with how __build_packet_message() already constructs NFULNL_MSG_PACKET headers.
Quoted source text, attributed separately from HOL analysis.