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CVE Record

CVE-2025-71268: btrfs: fix reservation leak in some error paths when inserting inline extent

In the Linux kernel, the following vulnerability has been resolved: btrfs: fix reservation leak in some error paths when inserting inline extent If we fail to allocate a path or join a transaction, we return from __cow_file_range_inline() without freeing the reserved qgroup data, resulting in a leak. Fix this by ensuring we call btrfs_qgroup_free_data() in such cases.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel btrfs accounting leak. Under certain error conditions, storage quota reservation data is not released. The public record does not quantify impact, but kernel resource leaks can affect reliability. Prioritize systems using btrfs and plan normal kernel patching unless vendor guidance raises urgency.

Executive priority

Treat this as a near-term kernel maintenance item for Linux assets using btrfs. Escalate priority if btrfs supports critical services, shared hosting, or vendor advisories later assign higher severity or exploitation evidence.

Technical view

In btrfs __cow_file_range_inline(), failures allocating a path or joining a transaction could return without btrfs_qgroup_free_data(), leaking reserved qgroup data. Stable commits add cleanup in those error paths. The public record does not state privilege requirements, reachable configurations, CVSS, or CWE.

Likely exposure

Exposure is most relevant to Linux systems running affected kernel builds and using btrfs. The qgroup cleanup detail suggests quota-group accounting is involved, but the provided sources do not define required mount options, distro status, or affected deployment patterns.

Exploitation context

No active exploitation is supported by the supplied sources, and KEV is false. The record describes a kernel error-path resource leak, not a public exploit chain. Attacker prerequisites and practical trigger conditions are not provided.

Researcher notes

Triage should focus on btrfs inline extent insertion error paths and qgroup reservation cleanup. Confirm whether downstream kernels include one of the stable fixes or an equivalent backport. The bundle lacks reproducer details, exploitability analysis, CVSS, CWE, and distro-specific status.

Mitigation direction

  • Apply kernel updates containing the referenced stable btrfs fixes.
  • Check Linux distribution advisories for equivalent backported fixes.
  • Prioritize btrfs hosts supporting critical storage or multi-tenant workloads.
  • Monitor vendor guidance for severity, impact, and configuration-specific mitigations.

Validation and detection

  • Inventory Linux hosts using btrfs filesystems.
  • Compare running kernel builds against vendor-fixed packages or referenced stable commits.
  • Check whether btrfs quota-group features are enabled where relevant.
  • Review kernel and storage monitoring for resource pressure on btrfs hosts.
Prepared
Confidence
medium
Sources
7

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

These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.

ATT&CK lookup starting points

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CVE-2025-71268 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
6Source 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
LinuxLinux94ed938aba557aa798acf496f09afb289b619fcd, 94ed938aba557aa798acf496f09afb289b619fcd, 94ed938aba557aa798acf496f09afb289b619fcd, 94ed938aba557aa798acf496f09afb289b619fcd, 94ed938aba557aa798acf496f09afb289b619fcdunaffected
LinuxLinux4.4, 0, 6.1.163, 6.6.124, 6.12.70, 6.18.10, 6.19affected
Weakness

CWE details

No CWE listed

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