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CVE-2026-78410— Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection

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存在竞争条件问题漏洞，该漏洞源于受限绑定挂载在特权挂载前未固定从fstab获取的源路径，本地非特权用户若可替换授权源或可写祖先路径，则能重定向SUID mount(8)绑定其他主机目录，且当fstab条目设置了X-mount.owner、X-mount.group或X-mount.mode时，root会更改被重定向inode的所有权或模式。

CVSS 7.8 · High EPSS 0.16% · P4

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-2026-78410

Vulnerability Information
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Vulnerability Title
Util-linux: util-linux: restricted bind mounts do not pin the source, allowing x-mount.owner/group/mode redirection
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in util-linux. Restricted bind mounts take the source path from fstab but do not pin that source before the privileged mount. A local unprivileged user who can replace the authorized source or a writable ancestor can redirect SUID mount(8) to bind another host directory. If the fstab entry also sets X-mount.owner, X-mount.group, or X-mount.mode, root then changes ownership or mode on that redirected inode.
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
检查时间与使用时间(TOCTOU)的竞争条件
Source: CVE Program / CVE List V5
Vulnerability Title
util-linux 竞争条件问题漏洞
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存在竞争条件问题漏洞，该漏洞源于受限绑定挂载在特权挂载前未固定从fstab获取的源路径，本地非特权用户若可替换授权源或可写祖先路径，则能重定向SUID mount(8)绑定其他主机目录，且当fstab条目设置了X-mount.owner、X-mount.group或X-mount.mode时，root会更改被重定向inode的所有权或模式。
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-2026-78410

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III. Intelligence Information for CVE-2026-78410

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Vendor Advisories for CVE-2026-78410 (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-2026-78408 7.9 HIGH Util-linux: util-linux: nsenter --join-cgroup leaks root cgroup migration authority
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-2026-78409 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-367

V. Comments for CVE-2026-78410

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