CVE-2026-74358

Local service interruption via misaddressed wait keys

Published Aug 15, 2026 · Updated Aug 15, 2026

Availability flaw in Linux kernel ext4 fast commits from 6.16 allows local users to interrupt service through filesystem activity. The FC_COMMITTING and FC_FLUSHING_DATA wait and wake paths use raw EXT4_STATE bits instead of the upper-half i_flags mapping required on 64-bit systems. The path requires a 64-bit kernel and an ext4 filesystem with fast commits enabled; the reported consequence is system instability or service interruption.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability flaw in Linux kernel ext4 fast commits from 6.16 allows local users to interrupt service through filesystem activity. The FC_COMMITTING and FC_FLUSHING_DATA wait and wake paths use raw EXT4_STATE bits instead of the upper-half i_flags mapping required on 64-bit systems. The path requires a 64-bit kernel and an ext4 filesystem with fast commits enabled; the reported consequence is system instability or service interruption.

The record

CVE
CVE-2026-74358
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-1102, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=6.16
  2. Affected versionversion=857d32f2618166765ce9306a246d0745afc76859 <8b3bc93fee6771775243665a0cf31857d6659775
  3. Affected versionversion=857d32f2618166765ce9306a246d0745afc76859 <d06df6e447a8510f86db44b2522d5375362a9499
  4. Affected versionversion=857d32f2618166765ce9306a246d0745afc76859 <e82d515092a0cf2bca92f399d5c330c324879cea

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.16; version=857d32f2618166765ce9306a246d0745afc76859 <8b3bc93fee6771775243665a0cf31857d6659775; version=857d32f2618166765ce9306a246d0745afc76859 <d06df6e447a8510f86db44b2522d5375362a9499; version=857d32f2618166765ce9306a246d0745afc76859 <e82d515092a0cf2bca92f399d5c330c324879cea

Published CVSS scores

5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:L

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.

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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 exploitUnconfirmed

Weakness, pattern, technique

CWE-1102Reliance on Machine-Dependent Data Representation
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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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