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CVE-2026-12505— Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall

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 cifs-utils是Samba组织开源的一套CIFS网络文件系统工具。 Samba cifs-utils存在权限许可和访问控制问题漏洞，该漏洞源于cifs.upcall helper未能安全地丢弃root权限，可能导致本地低权限攻击者使用特制的request_key有效载荷，诱使root拥有的helper进入包含恶意NSS模块的自定义环境，从而以root用户执行任意命令，提升权限并完全破坏系统。

CVSS 7.8 · High EPSS 0.16% · P4

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 8

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 0:7.6-1.el10_2< * unaffected
Red Hat Red Hat Enterprise Linux 6 any unknown
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 0:7.0-5.el8_10< * unaffected
Red Hat Red Hat Enterprise Linux 9 0:7.6-2.el9_8< * unaffected
0:7.6-2.el9_8< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any affected
Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202607220526-0< * unaffected
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I. Basic Information for CVE-2026-12505

Vulnerability Information
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Vulnerability Title
Cifs-utils: local privilege escalation via forged cifs.spnego key description in cifs.upcall
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the cifs-utils package where the cifs.upcall helper fails to securely drop its root privileges before looking up user information inside a user-controlled environment. A local, low privileged attacker can exploit this by using a crafted request_key payload to trick the root-owned helper into entering a custom environment (namespace) containing a malicious NSS module. This forces the system to load the attacker's controlled NSS Module and configuration, allowing them to execute arbitrary commands as the root user, elevating their privileges and fully compromising the system.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
带着不必要的权限执行
Source: CVE Program / CVE List V5
Vulnerability Title
Samba cifs-utils 权限许可和访问控制问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Samba cifs-utils是Samba组织开源的一套CIFS网络文件系统工具。 Samba cifs-utils存在权限许可和访问控制问题漏洞，该漏洞源于cifs.upcall helper未能安全地丢弃root权限，可能导致本地低权限攻击者使用特制的request_key有效载荷，诱使root拥有的helper进入包含恶意NSS模块的自定义环境，从而以root用户执行任意命令，提升权限并完全破坏系统。
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 0:7.6-1.el10_2 ~ * cpe:/o:redhat:enterprise_linux:10.2
Red Hat Red Hat Enterprise Linux 8 0:7.0-5.el8_10 ~ * cpe:/a:redhat:enterprise_linux:8::crb
Red Hat Red Hat Enterprise Linux 9 0:7.6-2.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat Enterprise Linux 9 0:7.6-2.el9_8 ~ * cpe:/a:redhat:enterprise_linux:9::appstream
Red Hat Red Hat OpenShift Container Platform 4.22 4.22.9.8.202607220526-0 ~ * cpe:/a:redhat:openshift:4.22::el9
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 OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-12505

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III. Intelligence Information for CVE-2026-12505

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Vendor Advisories for CVE-2026-12505 (5)

Other References for CVE-2026-12505 (2)

IV. Related Vulnerabilities

Same product: Red Hat Enterprise Linux 10
Same vendor: Red Hat
Same weakness: CWE-250

V. Comments for CVE-2026-12505

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