CVE-2026-43309

System hang via suspended dm-raid teardown

Published May 8, 2026 · Updated May 8, 2026

Denial of service in Linux kernel dm-raid allows local users to hang the system by removing a suspended RAID device tree. The dm-raid destructor calls md_stop(), which flushes the write-intent bitmap to metadata sub-devices that were already suspended, so the writes never complete. Triggering the indefinite block requires low-privileged local access, top-down suspension of a dm-raid tree with metadata, and removal of its top-level device.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel dm-raid allows local users to hang the system by removing a suspended RAID device tree. The dm-raid destructor calls md_stop(), which flushes the write-intent bitmap to metadata sub-devices that were already suspended, so the writes never complete. Triggering the indefinite block requires low-privileged local access, top-down suspension of a dm-raid tree with metadata, and removal of its top-level device.

The record

CVE
CVE-2026-43309
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24783dd06de870d646c25207bae186f78195f912
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <338378dfffbdbb8d37a18f0a0c0358812671f91e
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cefcb9297fbdb6d94b61787b4f8d84f55b741470

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <24783dd06de870d646c25207bae186f78195f912; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <338378dfffbdbb8d37a18f0a0c0358812671f91e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cefcb9297fbdb6d94b61787b4f8d84f55b741470

Published CVSS scores

5.5Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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 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

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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