Answer in brief
CVE-2026-43035 records a Medium severity (CVSS 5.5) vulnerability in net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak. 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 | >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <903c3405cfcc7700260e456ab66a5867586c9e69 || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <71a3eda7e850ae844cb8993065f4e410c11a46ce || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3 || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <e35f5195cd44ff4053fbc5d71ea97681728a0099 || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <d6db08484c6cb3d4ad696246f9d288eceba2a078 || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <906997ea3766c24fbbf9cc4bf17c047315bbd138 || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <1091b3c174441a52fdbb92e2fe00338f9371a91c || >=32a4f5ecd7381f30ae3bb36dea77a150ba68af2e <e6e3eb5ee89ac4c163d46429391c889a1bb5e404 | 903c3405cfcc7700260e456ab66a5867586c9e69, 71a3eda7e850ae844cb8993065f4e410c11a46ce, 4ae5d23f51fb91d7d1140c6f1ba77ab0756054c3, e35f5195cd44ff4053fbc5d71ea97681728a0099, d6db08484c6cb3d4ad696246f9d288eceba2a078, 906997ea3766c24fbbf9cc4bf17c047315bbd138, 1091b3c174441a52fdbb92e2fe00338f9371a91c, e6e3eb5ee89ac4c163d46429391c889a1bb5e404 |
| Linux/Linuxgeneric | 4.19 | 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
Sep 8, 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: net: sched: cls_api: fix tc_chain_fill_node to initialize tcm_info to zero to prevent an info-leak When building netlink messages, tc_chain_fill_node() never initializes the tcm_info field of struct tcmsg. Since the allocation is not zeroed, kernel heap memory is leaked to userspace through this 4-byte field. The fix simply zeroes tcm_info alongside the other fields that are already initialized.
Quoted source text, attributed separately from HOL analysis.