CVE-2026-76642

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Source
https://cve.org/CVERecord?id=CVE-2026-76642
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-76642.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-76642
Aliases
  • GHSA-m25x-3hj9-m26f
Downstream
Published
2026-09-03T10:54:08.150Z
Modified
2026-09-04T03:47:25.965878737Z
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 CVSS Calculator
Summary
util-linux libmount Privilege Escalation via Failed Mount Helper
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.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/76xxx/CVE-2026-76642.json",
    "unresolved_ranges": [
        {
            "source": "AFFECTED_FIELD",
            "extracted_events": [
                {
                    "introduced": "2.39"
                },
                {
                    "fixed": "2.41.6"
                },
                {
                    "introduced": "2.42"
                },
                {
                    "fixed": "2.42.3"
                }
            ]
        },
        {
            "source": "CPE_FIELD",
            "extracted_events": [
                {
                    "introduced": "2.39"
                },
                {
                    "fixed": "2.41.6"
                },
                {
                    "introduced": "2.42"
                },
                {
                    "fixed": "2.42.3"
                }
            ]
        }
    ],
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
        "CWE-390"
    ]
}
References

Affected packages

Git / github.com/util-linux/util-linux

Affected ranges

Type
GIT
Repo
https://github.com/util-linux/util-linux
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
230de59ffbee328506d92d3534e66d56de1afe5d
Database specific
Show details 
{
    "source": "DESCRIPTION",
    "extracted_events": [
        {
            "introduced": "0"
        },
        {
            "fixed": "2.41.5"
        }
    ]
}

Affected versions

v2.*
v2.10f
v2.10m
v2.10s
v2.11b
v2.11f
v2.11m
v2.11n
v2.11o
v2.11q
v2.11r
v2.11t
v2.11u
v2.11v
v2.11w
v2.11x
v2.11y
v2.12
v2.12a
v2.12b
v2.12d
v2.12h
v2.12i
v2.12j
v2.12k
v2.12l
v2.12m
v2.12o
v2.12p
v2.12pre
v2.12q
v2.12q-pre1
v2.12q-pre2
v2.12r
v2.12r-pre1
v2.13
v2.13-pre1
v2.13-pre2
v2.13-pre3
v2.13-pre4
v2.13-pre5
v2.13-pre6
v2.13-pre7
v2.13-rc1
v2.13-rc2
v2.13-rc3
v2.14
v2.14-rc1
v2.14-rc2
v2.14-rc3
v2.15
v2.15-rc1
v2.15-rc2
v2.16
v2.16-rc1
v2.16-rc2
v2.17
v2.17-rc1
v2.17-rc2
v2.17-rc3
v2.18
v2.18-rc1
v2.18-rc2
v2.19
v2.19-rc1
v2.19-rc2
v2.19-rc3
v2.2
v2.20
v2.20-rc1
v2.20-rc2
v2.21
v2.21-rc1
v2.21-rc2
v2.22
v2.22-rc1
v2.22-rc2
v2.23
v2.23-rc1
v2.23-rc2
v2.24
v2.24-rc1
v2.24-rc2
v2.25
v2.25-rc1
v2.25-rc2
v2.26
v2.26-rc1
v2.26-rc2
v2.27
v2.27-rc1
v2.27-rc2
v2.28
v2.28-rc1
v2.28-rc2
v2.29
v2.29-rc1
v2.29-rc2
v2.30
v2.30-rc1
v2.30-rc2
v2.31
v2.31-rc1
v2.31-rc2
v2.32
v2.32-rc1
v2.32-rc2
v2.33
v2.33-rc1
v2.33-rc2
v2.34
v2.34-rc1
v2.34-rc2
v2.35
v2.35-rc1
v2.35-rc2
v2.36
v2.36-rc1
v2.36-rc2
v2.37
v2.37-rc1
v2.37-rc2
v2.38
v2.38-rc1
v2.38-rc2
v2.38-rc3
v2.38-rc4
v2.39
v2.39-rc1
v2.39-rc2
v2.39-rc3
v2.40-rc1
v2.41
v2.41-devel
v2.41-rc1
v2.41-rc2
v2.41-start
v2.41.1
v2.41.2
v2.41.2-rc1
v2.41.3
v2.41.4
v2.42-start
v2.5
v2.7.1
v2.8
v2.9i
v2.9v

Database specific

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