CVE-2026-97561Network attack vector

Ownership spoofing via unchecked SMB SID remapping

Published Sep 25, 2026 · Updated Sep 25, 2026

Improper ownership mapping in the Linux SMB client before 7.2.7 allows remote attackers to dictate local file ownership metadata. Three POSIX and ACL conversion paths call sid_to_id() without honoring forced UID or GID mount flags, replacing configured identifiers with server-supplied mappings. Exposure requires an administrator to mount an attacker-controlled SMB share with forceuid or forcegid; the flaw falsifies client-side ownership metadata rather than changing server-side ownership.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper ownership mapping in the Linux SMB client before 7.2.7 allows remote attackers to dictate local file ownership metadata. Three POSIX and ACL conversion paths call sid_to_id() without honoring forced UID or GID mount flags, replacing configured identifiers with server-supplied mappings. Exposure requires an administrator to mount an attacker-controlled SMB share with forceuid or forcegid; the flaw falsifies client-side ownership metadata rather than changing server-side ownership.

The record

CVE
CVE-2026-97561
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <7.2.7
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <18a72975e9f35aadecc75b031f693f2d1f49308f
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1b74f8f8c1d13190b09fe623b729d36b7ac22a8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <7.2.7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <18a72975e9f35aadecc75b031f693f2d1f49308f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1b74f8f8c1d13190b09fe623b729d36b7ac22a8

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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