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CVE Record

CVE-2025-71239: audit: add fchmodat2() to change attributes class

In the Linux kernel, the following vulnerability has been resolved: audit: add fchmodat2() to change attributes class fchmodat2(), introduced in version 6.6 is currently not in the change attribute class of audit. Calling fchmodat2() to change a file attribute in the same fashion than chmod() or fchmodat() will bypass audit rules such as: -w /tmp/test -p rwa -k test_rwa The current patch adds fchmodat2() to the change attributes class.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel audit logging gap. A file-permission change path introduced with fchmodat2() was not classified like chmod() and fchmodat(), so some attribute changes could avoid expected audit records. The issue is mainly about monitoring, compliance evidence, and forensic visibility, not a documented privilege-escalation flaw.

Executive priority

Treat this as a visibility and assurance issue. It should be prioritized for audited or high-trust Linux systems, but the provided sources do not support emergency handling as an actively exploited remote compromise path.

Technical view

Linux kernel audit omitted fchmodat2(), introduced in 6.6, from the change-attributes audit class. Audit watches such as write/read/attribute rules could miss permission or attribute changes made through that syscall. Upstream stable commits add fchmodat2() to the appropriate audit class.

Likely exposure

Systems running affected Linux kernels with auditd or kernel audit rules that rely on attribute-change logging are most relevant. Exposure is higher for regulated servers, shared Linux hosts, and environments where file permission changes are security-significant.

Exploitation context

The source bundle does not show KEV listing or active exploitation. The practical risk is stealthier local activity against audit coverage if an actor already has a way to call the affected syscall on an unpatched kernel.

Researcher notes

Evidence is concise: the vulnerability is the missing audit classification for fchmodat2(). There is no CVSS, CWE, or exploit confirmation in the bundle. Use upstream commits and distribution backport status to determine fixed kernels.

Mitigation direction

  • Apply Linux vendor kernel updates containing the upstream stable audit fix.
  • Check distribution advisories because package fixed versions may differ through backports.
  • Prioritize hosts where audit logs support compliance, detection, or investigations.
  • Use compensating file integrity or EDR monitoring until patched.
  • Review audit assumptions for attribute-change coverage on Linux 6.6-era and later kernels.

Validation and detection

  • Inventory Linux kernel versions on systems using auditd or kernel audit rules.
  • Confirm whether the vendor kernel includes one of the referenced stable fixes.
  • Identify audit rules that depend on attribute-change events for protected paths.
  • Validate in nonproduction that fchmodat2() attribute changes generate expected audit events after patching.
  • Confirm downstream SIEM detections still receive the expected audit records.
Prepared
Confidence
high
Sources
8

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

Conservative CVE-to-ATT&CK context

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CVE-2025-71239 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors
3Timeline events
0ADP providers
7Source links

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux09da082b07bbae1c11d9560c8502800039aebcea, 09da082b07bbae1c11d9560c8502800039aebcea, 09da082b07bbae1c11d9560c8502800039aebcea, 09da082b07bbae1c11d9560c8502800039aebcea, 09da082b07bbae1c11d9560c8502800039aebceaunaffected
LinuxLinux6.6, 0, 6.6.128, 6.12.75, 6.18.16, 6.19.6, 7.0affected
Weakness

CWE details

No CWE listed

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