CVE-2024-26844

Local service interruption via bidirectional iterator misuse

Published Apr 17, 2024 · Updated May 11, 2026

Iterator direction confusion in the Linux block layer allows local users to interrupt service through a crafted SCSI request. The block request mapper builds one iov_iter for an SG_DXFER_TO_FROM_DEV request, then uses that iterator for both user-to-kernel and kernel-to-user copies despite its single direction. Reaching the warning requires low-privileged local access able to submit the bidirectional request, and the supported consequence is service interruption rather than data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Iterator direction confusion in the Linux block layer allows local users to interrupt service through a crafted SCSI request. The block request mapper builds one iov_iter for an SG_DXFER_TO_FROM_DEV request, then uses that iterator for both user-to-kernel and kernel-to-user copies despite its single direction. Reaching the warning requires low-privileged local access able to submit the bidirectional request, and the supported consequence is service interruption rather than data disclosure or modification.

The record

CVE
CVE-2024-26844
Published
Apr 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 17, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=4.0
  2. Affected versionversion=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <0f1bae071de9967602807472921829a54b2e5956
  3. Affected versionversion=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <13f3956eb5681a4045a8dfdef48df5dc4d9f58a6
  4. Affected versionversion=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <8fc80874103a5c20aebdc2401361aa01c817f75b
  5. Affected versionversion=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <cbaf9be337f7da25742acfce325119e3395b1f1b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.0; version=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <0f1bae071de9967602807472921829a54b2e5956; version=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <13f3956eb5681a4045a8dfdef48df5dc4d9f58a6; version=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <8fc80874103a5c20aebdc2401361aa01c817f75b; version=9124d3fe21b0947b03f4b87bcfb7acd675d6e85b <cbaf9be337f7da25742acfce325119e3395b1f1b

Published CVSS scores

5.5UbuntuCVSS: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

T1499Endpoint Denial of Service

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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