CVE-2026-78410Public exploitHinoki check available

Local privilege escalation via unpinned bind source

Published Sep 2, 2026 · Updated Sep 3, 2026

Time-of-check time-of-use race in util-linux mount(8) 2.39 through 2.42.2 allows local users to alter root-owned path metadata. Restricted bind handling authorizes an fstab source as a pathname, then open_tree re-resolves it without a pinned descriptor before the privileged mount. Exploitation requires a SUID mount(8), a user-enabled bind or rbind entry with X-mount.owner, X-mount.group, or X-mount.mode, and a replaceable source or writable ancestor; root then applies ownership or mode changes to an attacker-selected directory.

CVSS severity7.8
High
EPSS probability0.10%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
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Summary

What happened

Time-of-check time-of-use race in util-linux mount(8) 2.39 through 2.42.2 allows local users to alter root-owned path metadata. Restricted bind handling authorizes an fstab source as a pathname, then open_tree re-resolves it without a pinned descriptor before the privileged mount. Exploitation requires a SUID mount(8), a user-enabled bind or rbind entry with X-mount.owner, X-mount.group, or X-mount.mode, and a replaceable source or writable ancestor; root then applies ownership or mode changes to an attacker-selected directory.

The record

CVE
CVE-2026-78410
Published
Sep 2, 2026
Updated
Sep 3, 2026
Vendor
389 Directory Server
Product
Red Hat Enterprise Linux 10
Classifications
CWE-367, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 2, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

389 Directory Server · Red Hat Enterprise Linux 10Affected versions are unavailable in this record.
389 Directory Server · Red Hat Hardened ImagesAffected versions are unavailable in this record.

Published CVSS scores

7.8Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1068Exploitation for Privilege Escalation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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