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CVE-2026-76642 (GCVE-0-2026-76642)

Vulnerability from cvelistv5 – Published: 2026-09-03 10:54 – Updated: 2026-09-03 14:00
VLAI
Title
util-linux libmount Privilege Escalation via Failed Mount Helper
Summary
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.
Severity
8.5 (High)
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
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-03 14:00 UTC
CWE
  • CWE-390 - Detection of Error Condition Without Action
Assigner
References
Impacted products
Vendor Product Version CPE status
util-linux util-linux Affected: 2.39 , < 2.41.6 (custom)
Affected: 2.42 , < 2.42.3 (custom)
    cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*
    cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2026-09-02 00:00
Credits
Andreas Gabriel Berbescu Ivan Redondo Plaza
Show details on NVD website
To clipboard 

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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.