CVE-2026-46150

Local fanotify policy bypass via unrelated detached mark

Published May 28, 2026 · Updated May 28, 2026

Improper permission handling in affected Linux Kernel releases beginning with 4.12 allows local users to bypass fanotify access controls. A race with a detached mark from another notification group makes fsnotify_get_mark_safe() return false, so the caller skips the permission event. Exploitation requires a local low-privilege account and a privileged fanotify policy in use, allowing reads, writes, or execution that policy would deny.

CVSS severity7.1
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper permission handling in affected Linux Kernel releases beginning with 4.12 allows local users to bypass fanotify access controls. A race with a detached mark from another notification group makes fsnotify_get_mark_safe() return false, so the caller skips the permission event. Exploitation requires a local low-privilege account and a privileged fanotify policy in use, allowing reads, writes, or execution that policy would deny.

The record

CVE
CVE-2026-46150
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1562.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.12
  2. Affected versionversion=abc77577a669f424c5d0c185b9994f2621c52aa4 <7746e3bd4cc19b5092e00d32d676e329bfcb6900
  3. Affected versionversion=abc77577a669f424c5d0c185b9994f2621c52aa4 <7baa02b0ae9d17ec5f08836d8ea88ce1927d0678
  4. Affected versionversion=abc77577a669f424c5d0c185b9994f2621c52aa4 <895ebbedf88318607c24acc0f591c74b165e1d0a
  5. Affected versionversion=abc77577a669f424c5d0c185b9994f2621c52aa4 <b7b24b28c8cd55844cab908f4f39dded638d5538
  6. Affected versionversion=abc77577a669f424c5d0c185b9994f2621c52aa4 <f130790f1acc8399f32652846c875a251efd040f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.12; version=abc77577a669f424c5d0c185b9994f2621c52aa4 <7746e3bd4cc19b5092e00d32d676e329bfcb6900; version=abc77577a669f424c5d0c185b9994f2621c52aa4 <7baa02b0ae9d17ec5f08836d8ea88ce1927d0678; version=abc77577a669f424c5d0c185b9994f2621c52aa4 <895ebbedf88318607c24acc0f591c74b165e1d0a; version=abc77577a669f424c5d0c185b9994f2621c52aa4 <b7b24b28c8cd55844cab908f4f39dded638d5538; version=abc77577a669f424c5d0c185b9994f2621c52aa4 <f130790f1acc8399f32652846c875a251efd040f

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1562.001Impair Defenses: Disable or Modify Tools

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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