Vulnerability in Samba's vfs_worm Module Affects File Protection Mechanism
CVE-2026-2340

6.5MEDIUM

Key Information:

Vendor

Red Hat
Status
Red Hat Enterprise Linux 10
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Vendor
CVE Published:
27 May 2026

What is CVE-2026-2340?

A vulnerability in the vfs_worm module of Samba allows authenticated users with write access to bypass write-once, read-many (WORM) protections. This flaw arises from insufficient validation during rename operations, enabling an attacker to overwrite a protected file by renaming a newly created file to match the name of the existing WORM-protected file. This compromise can lead to unauthorized modifications and potential data integrity risks, highlighting the need for timely patching and validation mechanisms to safeguard against such issues.

References

https://access.redhat.com/security/cve/CVE-2026-2340
vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2447318
issue-trackingx_refsource_REDHAT
https://bugzilla.samba.org/show_bug.cgi?id=15997

CVSS V3.1

Score:
6.5
Severity:
MEDIUM
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Red Hat would like to thank Pavel Kohout (Aisle Research) for reporting this issue.
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