CVE-2026-74401

Service interruption via misordered DLM send queue

Published Aug 15, 2026 · Updated Aug 15, 2026

Use-after-free in Linux kernel DLM 5.14 and later allows local users to interrupt service through heavy DLM message traffic. The message-queue insertion path can place a handle out of sequence, causing dlm_receive_ack to stop before older tail entries and mishandle their references. Reaching the condition requires CAP_SYS_ADMIN to create a lockspace and root access to its device node; the observed consequence is kernel availability loss.

CVSS severity5.5
Medium
EPSS probability0.44%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel DLM 5.14 and later allows local users to interrupt service through heavy DLM message traffic. The message-queue insertion path can place a handle out of sequence, causing dlm_receive_ack to stop before older tail entries and mishandle their references. Reaching the condition requires CAP_SYS_ADMIN to create a lockspace and root access to its device node; the observed consequence is kernel availability loss.

The record

CVE
CVE-2026-74401
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
admin

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

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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=489d8e559c6596eb08e16447d9830bc39afbe54e <4d45250b1d22960f86d83245be188b16e456218b
  2. Affected versionversion=489d8e559c6596eb08e16447d9830bc39afbe54e <6369619f1b665f12d8c99cc6ff733c64eb08b22e
  3. Affected versionversion=489d8e559c6596eb08e16447d9830bc39afbe54e <712714f818d83373847874ab0f8e426be79296cf
  4. Affected versionversion=489d8e559c6596eb08e16447d9830bc39afbe54e <ae9e534e502a0f48c12baf83608c5de0ff0eab11
  5. Affected versionversion=489d8e559c6596eb08e16447d9830bc39afbe54e <d2248cb70c070f8f04762872772e155b59016f17
  6. Affected versionversion=5.14

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=489d8e559c6596eb08e16447d9830bc39afbe54e <4d45250b1d22960f86d83245be188b16e456218b; version=489d8e559c6596eb08e16447d9830bc39afbe54e <6369619f1b665f12d8c99cc6ff733c64eb08b22e; version=489d8e559c6596eb08e16447d9830bc39afbe54e <712714f818d83373847874ab0f8e426be79296cf; version=489d8e559c6596eb08e16447d9830bc39afbe54e <ae9e534e502a0f48c12baf83608c5de0ff0eab11; version=489d8e559c6596eb08e16447d9830bc39afbe54e <d2248cb70c070f8f04762872772e155b59016f17; version=5.14

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
9.8UbuntuCVSS:3.1/AV:N/AC:L/PR:N/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.

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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