DEBIAN-CVE-2026-76642

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Source
https://security-tracker.debian.org/tracker/CVE-2026-76642
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76642.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-76642
Upstream
Published
2026-09-03T13:06:08Z
Modified
2026-11-01T20:00:08Z
Severity
  • 8.5 (High) CVSS_V4 - CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X CVSS Calculator
Summary
[none]
Details

util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.

References

Affected packages

Debian:13 / util-linux

Package

Name
util-linux
Purl
pkg:deb/debian/util-linux?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.41-5
2.41.1-1
2.41.1-2
2.41.1-3
2.41.1-4
2.41.2-1
2.41.2-2
2.41.2-3
2.41.2-4
2.41.3-1
2.41.3-2
2.41.3-3
2.41.3-4
2.41.5-0+deb13u1
2.42~rc1-1
2.42~rc1-2
2.42~rc1-3
2.42~rc2-1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42.1-1
2.42.1-2
2.42.1-3
2.42.1-4
2.42.1-5
2.42.1-6
2.42.2-1
2.42.2-2
2.42.2-3
2.42.2-4
2.42.3-1
2.42.4-1

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76642.json"

Debian:14 / util-linux

Package

Name
util-linux
Purl
pkg:deb/debian/util-linux?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
2.42.3-1

Affected versions

2.*
2.41-5
2.41.1-1
2.41.1-2
2.41.1-3
2.41.1-4
2.41.2-1
2.41.2-2
2.41.2-3
2.41.2-4
2.41.3-1
2.41.3-2
2.41.3-3
2.41.3-4
2.42~rc1-1
2.42~rc1-2
2.42~rc1-3
2.42~rc2-1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42.1-1
2.42.1-2
2.42.1-3
2.42.1-4
2.42.1-5
2.42.1-6
2.42.2-1
2.42.2-2
2.42.2-3
2.42.2-4

Ecosystem specific 

{
    "urgency": "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-76642.json"