CVE-2025-21646

MEDIUM EPSS 9.9%
Published Jan 19, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jan 19, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
9.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Affected Products 11

VendorProductVersionRange
linuxlinux_kernel*≥5.8  –  <5.10.234
linuxlinux_kernel*≥5.11  –  <5.15.177
linuxlinux_kernel*≥5.16  –  <6.1.125
linuxlinux_kernel*≥6.2  –  <6.6.72
linuxlinux_kernel*≥6.7  –  <6.12.10
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any
linuxlinux_kernel6.13any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/7673030efe0f8ca1056d3849d61784c6caa052af
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7922b1f058fe24a93730511dd0ae2e1630920096
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7cb3e77e9b4e6ffa325a5559393d3283c9af3d01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9340385468d056bb700b8f28df236b81fc86a079
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aabe47cf5ac5e1db2ae0635f189d836f67024904
    Patch
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
  • lists.debian.org https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/7673030efe0f8ca1056d3849d61784c6caa052af
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7922b1f058fe24a93730511dd0ae2e1630920096
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7cb3e77e9b4e6ffa325a5559393d3283c9af3d01
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8fd56ad6e7c90ac2bddb0741c6b248c8c5d56ac8
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/9340385468d056bb700b8f28df236b81fc86a079
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aabe47cf5ac5e1db2ae0635f189d836f67024904
    Patch