Answer in brief
CVE-2026-43089 records a Unknown severity vulnerability in xfrm_user: fix info leak in build_mapping(). 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 | >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <521385cbd50ca9474396d88462fcdfa6489685d9 || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32 || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <d3125c541a96fb3c0fc7210112684baf22b6c24d || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <5a1a4b049ddde41466ccac0daeec326254b133f2 || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <700c9622b23c33b5933e6dcea816492c064e4e10 || >=3a2dfbe8acb154905fdc2fd03ec56df42e6c4cc4 <1beb76b2053b68c491b78370794b8ff63c8f8c02 | 521385cbd50ca9474396d88462fcdfa6489685d9, c2779ae9a3e5a044e5ccd564681511bbbcc5fc0f, 72a8de41c3eb4dcf22bf3b674ea38fb2f75d6f32, d3125c541a96fb3c0fc7210112684baf22b6c24d, 5a1a4b049ddde41466ccac0daeec326254b133f2, f779a6b6cdb6e12baa0663063ac59ab2a8f20c0c, 700c9622b23c33b5933e6dcea816492c064e4e10, 1beb76b2053b68c491b78370794b8ff63c8f8c02 |
| Linux/Linuxgeneric | 2.6.29 | 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: xfrm_user: fix info leak in build_mapping() struct xfrm_usersa_id has a one-byte padding hole after the proto field, which ends up never getting set to zero before copying out to userspace. Fix that up by zeroing out the whole structure before setting individual variables.
Quoted source text, attributed separately from HOL analysis.