CVE-2026-43314

Task hangs via leaked device-mapper requests

Published May 8, 2026 · Updated May 8, 2026

Denial of service in the Linux Kernel device-mapper allows local users to hang tasks indefinitely through I/O timeout fault injection. The request-based dm path calls blk_should_fake_timeout even though dm has no timeout handler, so an injected timeout leaves the request uncompleted. Reachability requires permission to configure kernel fault injection, a dm device backed by an iSCSI slave, subsequent I/O, and removal of the iSCSI session.

CVSS severity5.5
Medium
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

Denial of service in the Linux Kernel device-mapper allows local users to hang tasks indefinitely through I/O timeout fault injection. The request-based dm path calls blk_should_fake_timeout even though dm has no timeout handler, so an injected timeout leaves the request uncompleted. Reachability requires permission to configure kernel fault injection, a dm device backed by an iSCSI slave, subsequent I/O, and removal of the iSCSI session.

The record

CVE
CVE-2026-43314
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-772, T1499
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

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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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4f9e7ca933a9fbf9912a384b061a00c77332cbf0
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8200fca818c1e2f65bc6cb16d934ff6049302197
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b307b6307f6459841312432bd4bc9519cbac97f5
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8a23d4c995ef4227bd4de64cd3910637ee6162e
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ece6720de9403260088209b0b92d45e0b49ff856
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3a9c95a15d2f4466acad5c68faeff79ca5e9f47

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4f9e7ca933a9fbf9912a384b061a00c77332cbf0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6cdb21e0c9fdee484feba14fc9e72e9d07daf9f3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8200fca818c1e2f65bc6cb16d934ff6049302197; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b307b6307f6459841312432bd4bc9519cbac97f5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c8a23d4c995ef4227bd4de64cd3910637ee6162e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cf2d06c9fd4b6521ea5b7f73c99c64c2c6f5e224; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ece6720de9403260088209b0b92d45e0b49ff856; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f3a9c95a15d2f4466acad5c68faeff79ca5e9f47

Published CVSS scores

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

CWE-772Missing Release of Resource after Effective Lifetime
T1499Endpoint Denial of Service

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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