CVE-2022-49706

Local denial of service via zero-length iomap

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in Linux zonefs allows local users to hang readahead by reading a sequential zone file exactly at its current size. The zonefs_iomap_begin() read path labels that EOF request IOMAP_UNWRITTEN but returns a zero-length mapping, so iomap_readahead_iter() repeatedly returns without advancing. Exploitation requires local read access to a sequential file on a mounted zonefs instance, and the affected read remains stuck while consuming kernel execution time.

CVSS severity7.1
High
EPSS probability0.26%
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 zonefs allows local users to hang readahead by reading a sequential zone file exactly at its current size. The zonefs_iomap_begin() read path labels that EOF request IOMAP_UNWRITTEN but returns a zero-length mapping, so iomap_readahead_iter() repeatedly returns without advancing. Exploitation requires local read access to a sequential file on a mounted zonefs instance, and the affected read remains stuck while consuming kernel execution time.

The record

CVE
CVE-2022-49706
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-125, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE 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=5.6
  2. Affected versionversion=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <355be6131164c5bacf2e810763835aecb6e01fcb
  3. Affected versionversion=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <3a7f05f104347b407e865c10be2675cd833a4e48
  4. Affected versionversion=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <c1c1204c0d0c1dccc1310b9277fb2bd8b663d8fe
  5. Affected versionversion=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <c2f71b9bb398e2e573bdc2574149f42b45efe410

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <355be6131164c5bacf2e810763835aecb6e01fcb; version=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <3a7f05f104347b407e865c10be2675cd833a4e48; version=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <c1c1204c0d0c1dccc1310b9277fb2bd8b663d8fe; version=8dcc1a9d90c10fa4143e5c17821082e5e60e46a1 <c2f71b9bb398e2e573bdc2574149f42b45efe410

Published CVSS scores

7.1NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.1UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
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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