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CVE Record

CVE-2025-71204: smb/server: fix refcount leak in parse_durable_handle_context()

In the Linux kernel, the following vulnerability has been resolved: smb/server: fix refcount leak in parse_durable_handle_context() When the command is a replay operation and -ENOEXEC is returned, the refcount of ksmbd_file must be released.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a reference-count leak in the in-kernel SMB server. Under a replay-operation error path, the kernel fails to release a file reference. The public record does not provide CVSS, confirmed impact, or active exploitation evidence.

Executive priority

Handle as a monitored kernel maintenance item unless ksmbd is deployed on exposed servers. There is no public exploitation evidence in the bundle, but SMB-facing kernel code deserves timely patch validation once vendor packages are available.

Technical view

CVE-2025-71204 affects Linux ksmbd. In parse_durable_handle_context(), a replay operation returning -ENOEXEC can leave a ksmbd_file reference unreleased. The kernel stable fixes release the reference on that path. Source data does not describe privilege requirements, remote reachability, or crashability.

Likely exposure

Exposure is most relevant to Linux systems using the kernel SMB server, ksmbd. The bundle lists Linux as affected but does not clearly map all vulnerable release ranges to distribution packages. Systems not running ksmbd are less likely to exercise this code path.

Exploitation context

The source bundle marks KEV as false and provides no cited evidence of active exploitation or public weaponization. The record describes a fixed bug, not an exploit scenario. Treat exploitability as unproven from the available evidence.

Researcher notes

The key uncertainty is impact. A refcount leak may imply resource retention, but the record does not prove denial of service, privilege escalation, or remote exploitability. Analysis should focus on ksmbd replay handling and whether reachable requests can repeatedly trigger -ENOEXEC.

Mitigation direction

  • Apply Linux kernel updates that include the referenced stable fixes.
  • Check your distribution advisory for CVE-2025-71204 package status.
  • Disable ksmbd where the in-kernel SMB server is not required.
  • Restrict SMB exposure to trusted networks where business requirements allow.
  • Track vendor guidance because CVSS and impact details are incomplete.

Validation and detection

  • Inventory Linux hosts and kernel versions running SMB services.
  • Confirm whether ksmbd is loaded or enabled on each system.
  • Compare installed kernel packages with distribution CVE advisories.
  • Verify kernel changelogs include one of the referenced stable commits.
  • Prioritize internet-exposed or untrusted-network SMB servers for review.
Prepared
Confidence
medium
Sources
6

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-2025-71204 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
5Source 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
LinuxLinux8df4bcdb0a4232192b2445256c39b787d58ef14d, c8efcc786146a951091588e5fa7e3c754850cb3c, c8efcc786146a951091588e5fa7e3c754850cb3c, c8efcc786146a951091588e5fa7e3c754850cb3c, 6.6.32unaffected
LinuxLinux6.9, 0, 6.6.124, 6.12.70, 6.18.10, 6.19affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.