CVE-2026-15779— Samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validation
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Samba是Samba组织开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在权限许可和访问控制问题漏洞，该漏洞源于samba的pam_winbind在mkhomedir启用时未验证目标主目录路径不是关键系统目录（如/），可能导致非特权用户通过sudo委托触发/目录所有权变更，从而导致严重拒绝服务（SSH、sudo和包管理器故障）。以下版本受到影响：Red Hat Enterprise Linux 10版本、Red Hat Enterprise Linux
Possible ATT&CK Techniques 2 AI
T1484 · Domain or Tenant Policy Modification T1068 · Exploitation for Privilege EscalationAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 6 | any |
unknown |
| Red Hat | Red Hat Enterprise Linux 7 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 8 | any |
affected |
| Red Hat | Red Hat Enterprise Linux 9 | any |
affected |
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I. Basic Information for CVE-2026-15779
Vulnerability Information
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Vulnerability Title
Samba-winbind: samba: pam_winbind mkhomedir chowns critical system paths without validation
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in samba's pam_winbind. When mkhomedir is enabled, pam_winbind chowns the target account's home directory without validating the path is not a critical system directory such as /. On affected systems, accounts with / as their home directory (a common default for system accounts) can have this triggered not only by root, but by a non-root user holding a narrow sudo delegation to run commands as that account, causing ownership of / to change and resulting in severe denial of service (SSH, sudo, and package-manager failures). The change does not grant write access to / (which ships with restrictive 0555 permissions on RHEL), so the impact is availability loss rather than further privilege escalation.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
关键资源的不正确权限授予
Source: CVE Program / CVE List V5
Vulnerability Title
Samba 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba是Samba组织开源的一个适用于 Linux 和 Unix 的标准 Windows 互操作性程序套件。 Samba存在权限许可和访问控制问题漏洞，该漏洞源于samba的pam_winbind在mkhomedir启用时未验证目标主目录路径不是关键系统目录（如/），可能导致非特权用户通过sudo委托触发/目录所有权变更，从而导致严重拒绝服务（SSH、sudo和包管理器故障）。以下版本受到影响：Red Hat Enterprise Linux 10版本、Red Hat Enterprise Linux
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
II. Public POCs for CVE-2026-15779
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2026-15779 (3)
Vendor Advisories for CVE-2026-15779 (2)
Same Patch Batch · Red Hat · 2026-07-15 · 4 CVEs total
| CVE-2026-12382 | 8.2 HIGH | Aap-gateway: missing requestheaderstoremove allows mtls bypass via subject header spoofing |
| CVE-2026-15809 | 7.8 HIGH | Github.com/cri-o/cri-o: fix bypass for cve-2022-4318 — /etc/passwd injection via home env |
| CVE-2026-14251 | 7.7 HIGH | Gitops-operator: gitops-operator: missing allowednamespace check in reconcilerhook for clu |
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V. Comments for CVE-2026-15779
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