CVE & CISA-KEV Catalog

CVE-2026-76642

MEDIUM
7.8
CVSS v3
NVD

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.

CWE-390

How to fix

Remediation Available
util-linuxDebian
Fixed in:2.42.3-1CVE-2026-76642
utilRed Hat / RHEL
Fixed in:linux-main@x86_64RHSA-2026:63162
Fixed in:linux-main@srcRHSA-2026:63162
Fixed in:linux-main@aarch64RHSA-2026:63162
utilRocky
Fixed in:linux-main@aarch64RHSA-2026:63162
Fixed in:linux-main@x86_64RHSA-2026:63162
Fixed in:linux-main@srcRHSA-2026:63162

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Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

0.18%probability of exploitation in 30 days
7thpercentile

Low risk: more likely to be exploited than 7% of all known CVEs.

References

Related Vulnerabilities

Other CWE-390 vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2024-30255Medium5.388%-Fix
CVE-2024-27919High7.587%--
CVE-2025-26465Medium6.87.7%-Fix
CVE-2019-5051High8.83.9%-Fix
CVE-2021-40391Critical9.83.0%-Fix
CVE-2017-7485Medium5.92.0%--

Common questions

How do I fix CVE-2026-76642?

Published advisories record a fix for 3 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2026-76642 being actively exploited?

Not that we know of. CVE-2026-76642 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.18% is the estimated probability that it will be exploited in the next 30 days. That is higher than 7% of all scored CVEs.

How severe is CVE-2026-76642?

CVE-2026-76642 has a CVSS v3 base score of 7.8, rated moderate. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2026-76642 affect?

Published advisories record a fix for util-linux (Debian), util (Red Hat / RHEL), util (Rocky). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-09-03.