# CVE-2026-2340

## Summary

- **CVE ID:** CVE-2026-2340
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-280
- **Published:** May 27, 2026
- **Last Modified:** Sep 10, 2026

## Description

A flaw was found in Samba’s vfs_worm module. The module is intended to provide write-once, read-many (WORM) protections by preventing modification of files after a configurable grace period. Due to insufficient validation during rename operations, an authenticated user with write access to a share could overwrite a protected file by renaming a newly created file over the existing WORM-protected file.

## Affected Products

- Red Hat — Red Hat Enterprise Linux 10 (0:4.23.5-109.el10_2)
- Red Hat — Red Hat Enterprise Linux 9 (0:4.23.5-10.el9_8)
- Red Hat — Red Hat Enterprise Linux 9.6 Extended Update Support (0:4.21.3-14.el9_6.1)
- Red Hat — Red Hat Enterprise Linux 8 (0:4.19.4-16.el8_10)
- Red Hat — Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support (0:4.15.5-16.el8_6.1)
- Red Hat — Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On (0:4.15.5-16.el8_6.1)
- Red Hat — Red Hat Enterprise Linux 10.0 Extended Update Support (0:4.21.3-114.el10_0.1)
- Red Hat — Red Hat Enterprise Linux 8.8 Telecommunications Update Service (0:4.17.5-7.el8_8.1)
- Red Hat — Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions (0:4.17.5-7.el8_8.1)
- Red Hat — Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions (0:4.17.5-105.el9_2.5)
- Red Hat — Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions (0:4.19.4-105.el9_4.4)
- Red Hat — Red Hat OpenShift Container Platform 4.19 (4.19.9.6.202606241344-0)
- Red Hat — Red Hat OpenShift Container Platform 4.18 (418.94.202608142238-0)
- Red Hat — Red Hat OpenShift Container Platform 4.14 (414.92.202608172040-0)
- Red Hat — Red Hat OpenShift Container Platform 4.15 (415.92.202608180329-0)
- Red Hat — Red Hat OpenShift Container Platform 4.16 (416.94.202608150307-0)
- Red Hat — Red Hat OpenShift Container Platform 4.12 (412.86.202608241157-0)
- Red Hat — Red Hat OpenShift Container Platform 4.17 (417.94.202608250221-0)
- Red Hat — Red Hat OpenShift Container Platform 4.16 (416.94.202609011112-0)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-2340)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2447318)
- [CNA](https://bugzilla.samba.org/show_bug.cgi?id=15997)
- [CNA](https://access.redhat.com/errata/RHSA-2026:22963)
- [CNA](https://access.redhat.com/errata/RHSA-2026:25049)
- [CNA](https://access.redhat.com/errata/RHSA-2026:25979)
- [CNA](https://access.redhat.com/errata/RHSA-2026:22644)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28057)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28054)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28055)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28056)
- [CNA](https://access.redhat.com/errata/RHSA-2026:28053)
- [CNA](https://access.redhat.com/errata/RHSA-2026:29863)
- [CNA](https://access.redhat.com/errata/RHSA-2026:57483)
- [CNA](https://access.redhat.com/errata/RHSA-2026:56786)
- [CNA](https://access.redhat.com/errata/RHSA-2026:56853)
- [CNA](https://access.redhat.com/errata/RHSA-2026:56911)
- [CNA](https://access.redhat.com/errata/RHSA-2026:59831)
- [CNA](https://access.redhat.com/errata/RHSA-2026:60019)
- [CNA](https://access.redhat.com/errata/RHSA-2026:62549)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.94%
- **EPSS Percentile:** 58.8

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._