UBUNTU-CVE-2026-76642

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Source
https://ubuntu.com/security/CVE-2026-76642
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-76642
Upstream
Published
2026-09-03T13:06:00Z
Modified
2026-09-16T14:01:59Z
Severity
  • 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • 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 CVSS Calculator
  • Ubuntu - medium
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

Ubuntu:14.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=trusty

Affected ranges

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

Affected versions

2.*
2.20.1-5.1ubuntu9
2.20.1-5.1ubuntu10
2.20.1-5.1ubuntu11
2.20.1-5.1ubuntu12
2.20.1-5.1ubuntu13
2.20.1-5.1ubuntu14
2.20.1-5.1ubuntu15
2.20.1-5.1ubuntu16
2.20.1-5.1ubuntu17
2.20.1-5.1ubuntu18
2.20.1-5.1ubuntu19
2.20.1-5.1ubuntu20
2.20.1-5.1ubuntu20.1
2.20.1-5.1ubuntu20.2
2.20.1-5.1ubuntu20.3
2.20.1-5.1ubuntu20.4
2.20.1-5.1ubuntu20.6
2.20.1-5.1ubuntu20.7
2.20.1-5.1ubuntu20.9

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.20.1-5.1ubuntu20.9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:18.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=bionic

Affected ranges

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

Affected versions

2.*
2.30.1-0ubuntu4
2.30.2-0.1ubuntu1
2.30.2-0.1ubuntu2
2.30.2-0.1ubuntu3
2.31.1-0.4ubuntu2
2.31.1-0.4ubuntu3
2.31.1-0.4ubuntu3.1
2.31.1-0.4ubuntu3.2
2.31.1-0.4ubuntu3.3
2.31.1-0.4ubuntu3.4
2.31.1-0.4ubuntu3.5
2.31.1-0.4ubuntu3.6
2.31.1-0.4ubuntu3.7

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "fdisk",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "rfkill",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "setpriv",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.31.1-0.4ubuntu3.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:22.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=jammy

Affected ranges

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

Affected versions

2.*
2.36.1-8ubuntu1
2.37.2-4ubuntu1
2.37.2-4ubuntu2
2.37.2-4ubuntu3
2.37.2-4ubuntu3.3
2.37.2-4ubuntu3.4
2.37.2-4ubuntu3.5
2.37.2-4ubuntu3.6

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdextrautils",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "eject",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "fdisk",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "rfkill",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.37.2-4ubuntu3.6"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.37.2-4ubuntu3.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:24.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=noble

Affected ranges

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

Affected versions

2.*
2.39.1-4ubuntu2
2.39.2-6ubuntu1
2.39.3-6ubuntu2
2.39.3-9ubuntu2
2.39.3-9ubuntu4
2.39.3-9ubuntu6
2.39.3-9ubuntu6.1
2.39.3-9ubuntu6.2
2.39.3-9ubuntu6.3
2.39.3-9ubuntu6.4
2.39.3-9ubuntu6.5
2.39.3-9ubuntu6.6

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdextrautils",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "eject",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "fdisk",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "rfkill",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "util-linux-extra",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.39.3-9ubuntu6.6"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.39.3-9ubuntu6.6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:26.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=resolute

Affected ranges

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

Affected versions

2.*
2.41-4ubuntu4
2.41.2-4ubuntu1
2.41.2-4ubuntu2
2.41.2-4ubuntu3
2.41.3-3ubuntu1
2.41.3-3ubuntu2
2.41.3-3ubuntu2.2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdextrautils",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "eject",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "fdisk",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "lastlog2",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "liblastlog2-2",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libpam-lastlog2",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "login",
            "binary_version":  "1:4.16.0-2+really2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "rfkill",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "util-linux-extra",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.41.3-3ubuntu2.2"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.41.3-3ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:Pro:16.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

2.*
2.26.2-6ubuntu3
2.27-3ubuntu1
2.27.1-1ubuntu2
2.27.1-1ubuntu3
2.27.1-1ubuntu4
2.27.1-3ubuntu1
2.27.1-4ubuntu1
2.27.1-6ubuntu1
2.27.1-6ubuntu2
2.27.1-6ubuntu3
2.27.1-6ubuntu3.1
2.27.1-6ubuntu3.2
2.27.1-6ubuntu3.3
2.27.1-6ubuntu3.4
2.27.1-6ubuntu3.6
2.27.1-6ubuntu3.7
2.27.1-6ubuntu3.8
2.27.1-6ubuntu3.9
2.27.1-6ubuntu3.10
2.27.1-6ubuntu3.10+esm2

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.27.1-6ubuntu3.10+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
Ubuntu:Pro:20.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=esm-infra%2Ffocal

Affected ranges

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

Affected versions

2.*
2.34-0.1ubuntu2
2.34-0.1ubuntu4
2.34-0.1ubuntu5
2.34-0.1ubuntu6
2.34-0.1ubuntu7
2.34-0.1ubuntu8
2.34-0.1ubuntu9
2.34-0.1ubuntu9.1
2.34-0.1ubuntu9.3
2.34-0.1ubuntu9.4
2.34-0.1ubuntu9.5
2.34-0.1ubuntu9.6
2.34-0.1ubuntu9.6+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "bsdutils",
            "binary_version":  "1:2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "fdisk",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "libblkid1",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "libfdisk1",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "libmount1",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "libsmartcols1",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "libuuid1",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "mount",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "rfkill",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "util-linux",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "util-linux-locales",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        },
        {
            "binary_name":  "uuid-runtime",
            "binary_version":  "2.34-0.1ubuntu9.6+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"