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CVE-2026-78408— Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority

Quick assessment

Affected
Red Hat Red Hat Hardened Images
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.

util-linux是util-linux组织开源的一套操作系统基础工具集。 util-linux存在资源管理错误漏洞，该漏洞源于util-linux的nsenter --join-cgroup选项以root身份打开目标cgroup.procs文件，并在后续命名空间和凭据更改及execve()过程中保持该文件描述符打开，可能导致非特权用户迁移并终止不相关的root进程。

CVSS 7.9 · High EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1078 · Valid Accounts

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat Enterprise Linux 10 any affected
Red Hat Red Hat Enterprise Linux 7 any unaffected
Red Hat Red Hat Enterprise Linux 8 any unaffected
Red Hat Red Hat Enterprise Linux 9 any unaffected
any unaffected
any unaffected
Red Hat Red Hat Hardened Images 2.42.2-3.4.hum1< * unaffected
Red Hat Red Hat OpenShift Container Platform 4 any unaffected
any unaffected
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I. Basic Information for CVE-2026-78408

Vulnerability Information
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Vulnerability Title
Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority
Source: CVE Program / CVE List V5
Vulnerability Description
The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
缺失文件描述符或句柄在有效生命周期之后的释放处理
Source: CVE Program / CVE List V5
Vulnerability Title
util-linux 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
util-linux是util-linux组织开源的一套操作系统基础工具集。 util-linux存在资源管理错误漏洞，该漏洞源于util-linux的nsenter --join-cgroup选项以root身份打开目标cgroup.procs文件，并在后续命名空间和凭据更改及execve()过程中保持该文件描述符打开，可能导致非特权用户迁移并终止不相关的root进程。
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 Hardened Images 2.42.2-3.4.hum1 ~ * cpe:/a:redhat:hummingbird:1
Red Hat Red Hat Enterprise Linux 10 - cpe:/o:redhat:enterprise_linux:10
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
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat Enterprise Linux 9 - cpe:/o:redhat:enterprise_linux:9
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4
Red Hat Red Hat OpenShift Container Platform 4 - cpe:/a:redhat:openshift:4

II. Public POCs for CVE-2026-78408

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III. Intelligence Information for CVE-2026-78408

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Vendor Advisories for CVE-2026-78408 (4)

Same Patch Batch · Red Hat · 2026-09-02 · 8 CVEs total

CVE-2026-66786 9.1 CRITICAL Submariner: submariner: ipsec.conf stanza injection via remote-supplied cablename and subn
CVE-2026-84838 7.8 HIGH Rpm: command injection in rpmuncompress via unescaped filenames passed to popen()
CVE-2026-84837 7.8 HIGH Rpm: command injection in `rpmbuild -t*` (`gettarspec`) via unescaped tarball path
CVE-2026-78410 7.8 HIGH Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.own
CVE-2026-78409 7.0 HIGH Util-linux: util-linux: x-mount.subdir detached-tree resolution can escape via intermediat
CVE-2026-82968 6.4 MEDIUM Keycloak-services: keycloak-services: cross-session email verification proof not bound to
CVE-2026-53683 4.3 MEDIUM Freeipa: idm: idm/freeipa web ui - client-side open redirect in reset_password.html

IV. Related Vulnerabilities

Same product: Red Hat Hardened Images
Same vendor: Red Hat
Same weakness: CWE-775

V. Comments for CVE-2026-78408

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