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9.0 Critical

CVE-2026-4408 Samba: remote code execution in samr

Description

A flaw was found in Samba. A remote attacker can exploit a misconfiguration in Samba file servers and classic domain controllers that use the "check password script" feature. If this script is configured with the %u substitution character, the client-controlled username is passed without proper escaping of shell meta-characters. This vulnerability allows an attacker to achieve remote command execution on the affected system. This issue primarily affects non-standard configurations where the "check password script" is used with %u and the samba-dcerpcd service is started as a system service.

CVSS 3.1 detail

Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitable remotely over the network, without an account and without any user action; an attacker can seriously compromise confidentiality, integrity or availability.

Attack vector
Network
Attack complexity
High
Privileges required
None
Interaction
None
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

Affected products and versions

Product Affected versions Fixed in
Red Hat Enterprise Linux 10 Versions not published
Red Hat Enterprise Linux 6 Versions not published
Red Hat Enterprise Linux 7 Versions not published
Red Hat Enterprise Linux 8 Versions not published
Red Hat Enterprise Linux 9 Versions not published
Red Hat OpenShift Container Platform 4 Versions not published
Red Hat Enterprise Linux 9.6 Extended Update Support Versions not published
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support Versions not published
Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On Versions not published
Show the 54 other branches
Product Affected versions Fixed in
Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support Versions not published
Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On Versions not published
Red Hat Enterprise Linux 10.0 Extended Update Support Versions not published
Red Hat Enterprise Linux 8.8 Telecommunications Update Service Versions not published
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux 7 Extended Lifecycle Support Versions not published
Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions Versions not published
Red Hat Enterprise Linux Server (v. 7 ELS) Versions not published
Red Hat Enterprise Linux Server ResilientStorage (v. 7 ELS) Versions not published
Red Hat Enterprise Linux Server Optional (v. 7 ELS) Versions not published
Red Hat Enterprise Linux AppStream EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux AppStream (v. 10) Versions not published
Red Hat Enterprise Linux AppStream (v. 8) Versions not published
Red Hat Enterprise Linux AppStream AUS (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream TUS (v.8.8) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.2) Versions not published
Red Hat Enterprise Linux AppStream E4S (v.9.4) Versions not published
Red Hat Enterprise Linux AppStream EUS (v.9.6) Versions not published
Red Hat Enterprise Linux AppStream (v. 9) Versions not published
Red Hat Enterprise Linux BaseOS EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux BaseOS (v. 10) Versions not published
Red Hat Enterprise Linux BaseOS (v. 8) Versions not published
Red Hat Enterprise Linux BaseOS AUS (v.8.4) Versions not published
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.4) Versions not published
Red Hat Enterprise Linux BaseOS AUS (v.8.6) Versions not published
Red Hat Enterprise Linux BaseOS EUS EXTENSION (v.8.6) Versions not published
Red Hat Enterprise Linux BaseOS E4S (v.8.8) Versions not published
Red Hat Enterprise Linux BaseOS TUS (v.8.8) Versions not published
Red Hat Enterprise Linux BaseOS E4S (v.9.2) Versions not published
Red Hat Enterprise Linux BaseOS E4S (v.9.4) Versions not published
Red Hat Enterprise Linux BaseOS EUS (v.9.6) Versions not published
Red Hat Enterprise Linux BaseOS (v. 9) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) Versions not published
Red Hat Enterprise Linux CRB (v. 8) Versions not published
Red Hat CodeReady Linux Builder EUS (v.9.6) Versions not published
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) Versions not published
Red Hat Enterprise Linux Resilient Storage E4S (v.9.2) Versions not published
Red Hat Enterprise Linux Resilient Storage E4S (v.9.4) Versions not published
Red Hat Enterprise Linux Resilient Storage EUS (v.9.6) Versions not published
Red Hat Enterprise Linux Resilient Storage (v. 9) Versions not published
Red Hat OpenShift Container Platform 4.21 4.21 earliest → < 4.21.9.6.202606241859-0 4.21.9.6.202606241859-0
Red Hat OpenShift Container Platform 4.20 4.20 earliest → < 4.20.9.6.202606241928-0 4.20.9.6.202606241928-0
Red Hat OpenShift Container Platform 4.19 4.19 earliest → < 4.19.9.6.202606241344-0 4.19.9.6.202606241344-0
Red Hat OpenShift Container Platform 4.18 418.94 earliest → < 418.94.202608142238-0 418.94.202608142238-0
Red Hat OpenShift Container Platform 4.14 414.92 earliest → < 414.92.202608172040-0 414.92.202608172040-0
Red Hat OpenShift Container Platform 4.15 415.92 earliest → < 415.92.202608180329-0 415.92.202608180329-0
Red Hat OpenShift Container Platform 4.16 416.94 earliest → < 416.94.202608150307-0 416.94.202608150307-0
Red Hat OpenShift Container Platform 4.12 412.86 earliest → < 412.86.202608241157-0 412.86.202608241157-0
Red Hat OpenShift Container Platform 4.17 417.94 earliest → < 417.94.202608250221-0 417.94.202608250221-0
Red Hat OpenShift Container Platform 4.13 413.92 earliest → < 413.92.202609080414-0 413.92.202609080414-0

References

Timeline

  1. Published
  2. Last modified

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