Answer in brief
CVE-2025-21646 records a Unknown severity vulnerability in afs: Fix the maximum cell name length. 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.
Answer in brief
CVE-2025-21646 records a Unknown severity vulnerability in afs: Fix the maximum cell name length. 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 | >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <9340385468d056bb700b8f28df236b81fc86a079 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7cb3e77e9b4e6ffa325a5559393d3283c9af3d01 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <aabe47cf5ac5e1db2ae0635f189d836f67024904 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7673030efe0f8ca1056d3849d61784c6caa052af || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7922b1f058fe24a93730511dd0ae2e1630920096 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8 | 9340385468d056bb700b8f28df236b81fc86a079, 7cb3e77e9b4e6ffa325a5559393d3283c9af3d01, aabe47cf5ac5e1db2ae0635f189d836f67024904, 7673030efe0f8ca1056d3849d61784c6caa052af, 7922b1f058fe24a93730511dd0ae2e1630920096, 8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8 |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
Jan 19, 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: afs: Fix the maximum cell name length The kafs filesystem limits the maximum length of a cell to 256 bytes, but a problem occurs if someone actually does that: kafs tries to create a directory under /proc/net/afs/ with the name of the cell, but that fails with a warning: WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405 because procfs limits the maximum filename length to 255. However, the DNS limits the maximum lookup length and, by extension, the maximum cell name, to 255 less two (length count and trailing NUL). Fix this by limiting the maximum acceptable cellname length to 253. This also allows us to be sure we can create the "/afs/.<cell>/" mountpoint too. Further, split the YFS VL record cell name maximum to be the 256 allowed by the protocol and ignore the record retrieved by YFSVL.GetCellName if it exceeds 253.
Quoted source text, attributed separately from HOL analysis.
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 | >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <9340385468d056bb700b8f28df236b81fc86a079 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7cb3e77e9b4e6ffa325a5559393d3283c9af3d01 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <aabe47cf5ac5e1db2ae0635f189d836f67024904 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7673030efe0f8ca1056d3849d61784c6caa052af || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <7922b1f058fe24a93730511dd0ae2e1630920096 || >=c3e9f888263bb4df11cbd623ceced02081cb2f9f <8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8 | 9340385468d056bb700b8f28df236b81fc86a079, 7cb3e77e9b4e6ffa325a5559393d3283c9af3d01, aabe47cf5ac5e1db2ae0635f189d836f67024904, 7673030efe0f8ca1056d3849d61784c6caa052af, 7922b1f058fe24a93730511dd0ae2e1630920096, 8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8 |
| Linux/Linuxgeneric | 5.8 | Not reported |
Published upstream
Jan 19, 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: afs: Fix the maximum cell name length The kafs filesystem limits the maximum length of a cell to 256 bytes, but a problem occurs if someone actually does that: kafs tries to create a directory under /proc/net/afs/ with the name of the cell, but that fails with a warning: WARNING: CPU: 0 PID: 9 at fs/proc/generic.c:405 because procfs limits the maximum filename length to 255. However, the DNS limits the maximum lookup length and, by extension, the maximum cell name, to 255 less two (length count and trailing NUL). Fix this by limiting the maximum acceptable cellname length to 253. This also allows us to be sure we can create the "/afs/.<cell>/" mountpoint too. Further, split the YFS VL record cell name maximum to be the 256 allowed by the protocol and ignore the record retrieved by YFSVL.GetCellName if it exceeds 253.
Quoted source text, attributed separately from HOL analysis.