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Review reviewHigh

CVE-2025-39901

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: i40e: remove read access to debugfs files The 'command' and 'netdev_ops' debugfs files are a legacy debugging interface supported by the i40e driver since its early days by commit 02e9c290814c ("i40e: debugfs interface"). Both of these debugfs files provide a read handler which is mostly useless, and which is implemented with questionable logic. They both use a static 256 byte buffer which is initialized to the empty string. In the case of the 'command' file this buffer is literally never used and simply wastes space. In th...

CVSS
7.1
EPSS
0.14%
4.02% percentile
CISA KEV
Not listed
Published
2025.10.01
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: i40e: remove read access to debugfs files The 'command' and 'netdev_ops' debugfs files are a legacy debugging interface supported by the i40e driver since its early days by commit 02e9c290814c ("i40e: debugfs interface"). Both of these debugfs files provide a read handler which is mostly useless, and which is implemented with questionable logic. They both use a static 256 byte buffer which is initialized to the empty string. In the case of the 'command' file this buffer is literally never used and simply wastes space. In th...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 02e9c290814cc143ceccecb14eac3e7a05da745e < ef40d9411469306e524e7887c51b709377e6ef65, >= 02e9c290814cc143ceccecb14eac3e7a05da745e < 70d3dad7d5ad077965d7a63eed1942b7ba49bfb4, >= 02e9c290814cc143ceccecb14eac3e7a05da745e < 7d190963b80f4cd99d7008615600aa7cc993c6ba, >= 02e9c290814cc143ceccecb14eac3e7a05da745e < 9fcdb1c3c4ba134434694c001dbff343f1ffa319, >= 3.12, >= 3.12 < 6.12.46, >= 6.13 < 6.16.6, 6.17
Fixed versions
6.12.46, 6.16.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125