Answer in brief
CVE-2025-21955 records a Unknown severity vulnerability in ksmbd: prevent connection release during oplock break notification. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <09aeab68033161cb54f194da93e51a11aee6144b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a4261bbc33fbf99b99c80aa3a2c5097611802980 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa || >=0626e6641f6b467447c81dd7678a69c66f7746cf <3aa660c059240e0c795217182cf7df32909dd917 | 09aeab68033161cb54f194da93e51a11aee6144b, a4261bbc33fbf99b99c80aa3a2c5097611802980, f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa, 3aa660c059240e0c795217182cf7df32909dd917 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Apr 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: ksmbd: prevent connection release during oplock break notification ksmbd_work could be freed when after connection release. Increment r_count of ksmbd_conn to indicate that requests are not finished yet and to not release the connection.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2025-21955 records a Unknown severity vulnerability in ksmbd: prevent connection release during oplock break notification. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (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). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=0626e6641f6b467447c81dd7678a69c66f7746cf <09aeab68033161cb54f194da93e51a11aee6144b || >=0626e6641f6b467447c81dd7678a69c66f7746cf <a4261bbc33fbf99b99c80aa3a2c5097611802980 || >=0626e6641f6b467447c81dd7678a69c66f7746cf <f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa || >=0626e6641f6b467447c81dd7678a69c66f7746cf <3aa660c059240e0c795217182cf7df32909dd917 | 09aeab68033161cb54f194da93e51a11aee6144b, a4261bbc33fbf99b99c80aa3a2c5097611802980, f17d1c63a76b0fe8e9c78023a86507a3a6d62cfa, 3aa660c059240e0c795217182cf7df32909dd917 |
| Linux/Linuxgeneric | 5.15 | Not reported |
Published upstream
Apr 1, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 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: ksmbd: prevent connection release during oplock break notification ksmbd_work could be freed when after connection release. Increment r_count of ksmbd_conn to indicate that requests are not finished yet and to not release the connection.
Quoted source text, attributed separately from HOL analysis.