Answer in brief
CVE-2025-21728 records a Unknown severity vulnerability in bpf: Send signals asynchronously if !preemptible. 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 | >=fd29a0242f86b2d95ad666aa9f92a3d0f7bfdab6 <feba1308bc5e8e04cee751d39fae8a9b407a9034 || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <ce51eab2070e295d298f42a2f1db269cd1b56d55 || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4 || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <be42a09fe898635b0093c0c8dac1bfabe225c240 || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <eeef8e65041a031bd8a747a392c14b76a123a12c || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <78b97783496b454435639937db3303e900a24d3f || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <092fc76b7ab4163e008f9cde596a58dad2108260 || >=1bc7896e9ef44fd77858b3ef0b8a6840be3a4494 <87c544108b612512b254c8f79aa5c0a8546e2cc4 || 7930d01afb7281edd9782971e0cca6fe587c7a7b || >=5.4.33 <5.4.291 || >=5.5.18 <5.6 | feba1308bc5e8e04cee751d39fae8a9b407a9034, ce51eab2070e295d298f42a2f1db269cd1b56d55, e306eaaa3d78b462db5f5b11e0171f9d2b6ca3f4, be42a09fe898635b0093c0c8dac1bfabe225c240, eeef8e65041a031bd8a747a392c14b76a123a12c, 78b97783496b454435639937db3303e900a24d3f, 092fc76b7ab4163e008f9cde596a58dad2108260, 87c544108b612512b254c8f79aa5c0a8546e2cc4, 5.4.291, 5.6 |
| Linux/Linuxgeneric | 5.6 | Not reported |
| Siemens/SIMATIC S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 CPU 1518F-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
| Siemens/SIPLUS S7-1500 CPU 1518-4 PN/DP MFPgeneric | >=V3.1.5 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Jul 14, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 6, 2026
In the Linux kernel, the following vulnerability has been resolved: bpf: Send signals asynchronously if !preemptible BPF programs can execute in all kinds of contexts and when a program running in a non-preemptible context uses the bpf_send_signal() kfunc, it will cause issues because this kfunc can sleep. Change `irqs_disabled()` to `!preemptible()`.
Quoted source text, attributed separately from HOL analysis.