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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2025-21646 Detail

Description

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.


Metrics

 
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CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/7673030efe0f8ca1056d3849d61784c6caa052af kernel.org Patch 
https://git.kernel.org/stable/c/7922b1f058fe24a93730511dd0ae2e1630920096 kernel.org Patch 
https://git.kernel.org/stable/c/7cb3e77e9b4e6ffa325a5559393d3283c9af3d01 kernel.org Patch 
https://git.kernel.org/stable/c/8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8 kernel.org Patch 
https://git.kernel.org/stable/c/9340385468d056bb700b8f28df236b81fc86a079 kernel.org Patch 
https://git.kernel.org/stable/c/aabe47cf5ac5e1db2ae0635f189d836f67024904 kernel.org Patch 
https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html CVE
https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html CVE

Weakness Enumeration

CWE-ID CWE Name Source
NVD-CWE-noinfo Insufficient Information cwe source acceptance level NIST  

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Change History

5 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-21646
NVD Published Date:
01/19/2025
NVD Last Modified:
11/03/2025
Source:
kernel.org