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… (CVE-2026-4408)
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.
AI Analysis
Technical Summary
This advisory covers security updates for Red Hat OpenShift Container Platform 4.20 and 4.21.22 that fix multiple vulnerabilities. The primary issues include a remote code execution vulnerability in Samba's SAMR protocol (CVE-2026-4408) and a kernel vulnerability related to net/sched act_pedit (CVE-2026-46331). The Samba vulnerability allows remote attackers to execute arbitrary code, while the kernel issue involves extending the writable skb range per key. Red Hat has released updated container images and RPM packages to address these vulnerabilities. Users should upgrade their OpenShift clusters to these updated versions to mitigate the risks.
Potential Impact
Successful exploitation of CVE-2026-4408 could allow remote code execution with high impact on confidentiality, integrity, and availability. The kernel vulnerability CVE-2026-46331 also impacts system stability and security. Both vulnerabilities pose significant risks to affected OpenShift Container Platform deployments if left unpatched.
Mitigation Recommendations
Red Hat has released updated container images and RPM packages that fix these vulnerabilities. Users of OpenShift Container Platform 4.20 and 4.21.22 should upgrade to these updated versions as soon as they are available in their release channels. Upgrades can be performed using the OpenShift CLI (oc) or the web console. Detailed upgrade instructions are provided in the official Red Hat documentation. Patch status is confirmed as fixed in these updated releases.
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… (CVE-2026-4408)
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 v3.1
Score 9.0critical
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers security updates for Red Hat OpenShift Container Platform 4.20 and 4.21.22 that fix multiple vulnerabilities. The primary issues include a remote code execution vulnerability in Samba's SAMR protocol (CVE-2026-4408) and a kernel vulnerability related to net/sched act_pedit (CVE-2026-46331). The Samba vulnerability allows remote attackers to execute arbitrary code, while the kernel issue involves extending the writable skb range per key. Red Hat has released updated container images and RPM packages to address these vulnerabilities. Users should upgrade their OpenShift clusters to these updated versions to mitigate the risks.
Potential Impact
Successful exploitation of CVE-2026-4408 could allow remote code execution with high impact on confidentiality, integrity, and availability. The kernel vulnerability CVE-2026-46331 also impacts system stability and security. Both vulnerabilities pose significant risks to affected OpenShift Container Platform deployments if left unpatched.
Mitigation Recommendations
Red Hat has released updated container images and RPM packages that fix these vulnerabilities. Users of OpenShift Container Platform 4.20 and 4.21.22 should upgrade to these updated versions as soon as they are available in their release channels. Upgrades can be performed using the OpenShift CLI (oc) or the web console. Detailed upgrade instructions are provided in the official Red Hat documentation. Patch status is confirmed as fixed in these updated releases.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:28058
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-4480"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6a3aab54eed863c81e3a3a37
Added to database: 06/23/2026, 15:50:44 UTC
Last enriched: 07/10/2026, 11:55:59 UTC
Last updated: 09/23/2026, 01:47:43 UTC
Views: 187
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