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VULNERABILITIES

CVE-2026-76642 Details

Description

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:7.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f CISA-ADP
https://github.com/util-linux/util-linux [email protected]
https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L476 [email protected]
https://github.com/util-linux/util-linux/blob/v2.42.2/libmount/src/context_mount.c#L892 [email protected]
https://github.com/util-linux/util-linux/commit/1d14676ea70003e9f5b2a6a76af0cadb1190411a [email protected]

see all 9 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-390Detection of Error Condition Without Action[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-76642
NVD Published Date:
Sep 3, 2026
NVD Last Modified:
Sep 24, 2026
Source:
[email protected]
CVE-2026-76642 Details - Not Deferred