Answer in brief
CVE-2025-23131 records a Unknown severity vulnerability in dlm: prevent NPD when writing a positive value to event_done. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). 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 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=8511a2728ab82cab398e39d019f5cf1246021c1c <a1c41aebb184d9228a440dcb6761224e65b0e49a || >=8511a2728ab82cab398e39d019f5cf1246021c1c <ee28d99d789b077565cbe0377374d1e826c64d93 || >=8511a2728ab82cab398e39d019f5cf1246021c1c <c7837e2c96559663c33f43da403d9cf3cf77cfa7 || >=8511a2728ab82cab398e39d019f5cf1246021c1c <7109d69bec6edce546dc870e66bd2b668a3d5549 || >=8511a2728ab82cab398e39d019f5cf1246021c1c <10b7a59814765d18d43555c9cef4eb3048b7e8a3 || >=8511a2728ab82cab398e39d019f5cf1246021c1c <b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c || >=8511a2728ab82cab398e39d019f5cf1246021c1c <8e2bad543eca5c25cd02cbc63d72557934d45f13 | a1c41aebb184d9228a440dcb6761224e65b0e49a, ee28d99d789b077565cbe0377374d1e826c64d93, c7837e2c96559663c33f43da403d9cf3cf77cfa7, 7109d69bec6edce546dc870e66bd2b668a3d5549, 10b7a59814765d18d43555c9cef4eb3048b7e8a3, b73c4ad4d387fe5bc988145bd9f1bc0de76afd5c, 8e2bad543eca5c25cd02cbc63d72557934d45f13 |
| Linux/Linuxgeneric | 2.6.31 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Apr 16, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Oct 15, 2026
In the Linux kernel, the following vulnerability has been resolved: dlm: prevent NPD when writing a positive value to event_done do_uevent returns the value written to event_done. In case it is a positive value, new_lockspace would undo all the work, and lockspace would not be set. __dlm_new_lockspace, however, would treat that positive value as a success due to commit 8511a2728ab8 ("dlm: fix use count with multiple joins"). Down the line, device_create_lockspace would pass that NULL lockspace to dlm_find_lockspace_local, leading to a NULL pointer dereference. Treating such positive values as successes prevents the problem. Given this has been broken for so long, this is unlikely to break userspace expectations.
Quoted source text, attributed separately from HOL analysis.