Answer in brief
CVE-2025-21826 records a High severity (CVSS 7.8) vulnerability in netfilter: nf_tables: reject mismatching sum of field_len with set key length. 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 - BIOS (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.
CVSS is 7.8. 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 - BIOS (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 | >=2d4c0798a1ef8db15b3277697ac2def4eda42312 <6b467c8feac759f4c5c86d708beca2aa2b29584f || >=77be8c495a3f841e88b46508cc20d3d7d3289da3 <5083a7ae45003456c253e981b30a43f71230b4a3 || >=9cb084df01e198119de477ac691d682fb01e80f3 <2ac254343d3cf228ae0738b2615fedf85d000752 || >=dc45bb00e66a33de1abb29e3d587880e1d4d9a7e <82e491e085719068179ff6a5466b7387cc4bbf32 || >=3ce67e3793f48c1b9635beb9bb71116ca1e51b58 <49b7182b97bafbd5645414aff054b4a65d05823d || >=3ce67e3793f48c1b9635beb9bb71116ca1e51b58 <ab50d0eff4a939d20c37721fd9766347efcdb6f6 || >=3ce67e3793f48c1b9635beb9bb71116ca1e51b58 <1b9335a8000fb70742f7db10af314104b6ace220 || ff67e3e488090908dc015ba04d7407d8bd467f7e || >=5.10.209 <5.10.235 || >=5.15.148 <5.15.179 || >=6.1.75 <6.1.129 || >=6.6.14 <6.6.76 || >=6.7.2 <6.8 | 6b467c8feac759f4c5c86d708beca2aa2b29584f, 5083a7ae45003456c253e981b30a43f71230b4a3, 2ac254343d3cf228ae0738b2615fedf85d000752, 82e491e085719068179ff6a5466b7387cc4bbf32, 49b7182b97bafbd5645414aff054b4a65d05823d, ab50d0eff4a939d20c37721fd9766347efcdb6f6, 1b9335a8000fb70742f7db10af314104b6ace220, 5.10.235, 5.15.179, 6.1.129, 6.6.76, 6.8 |
| Linux/Linuxgeneric | 6.8 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - BIOSgeneric | >=0 <* | * |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Mar 6, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject mismatching sum of field_len with set key length The field length description provides the length of each separated key field in the concatenation, each field gets rounded up to 32-bits to calculate the pipapo rule width from pipapo_init(). The set key length provides the total size of the key aligned to 32-bits. Register-based arithmetics still allows for combining mismatching set key length and field length description, eg. set key length 10 and field description [ 5, 4 ] leading to pipapo width of 12.
Quoted source text, attributed separately from HOL analysis.