CVE-2023-49298Public exploitNetwork attack vector

Copied-file corruption via incomplete dirty-dnode check

Published Nov 24, 2023 · Updated Nov 3, 2025

File corruption in OpenZFS 2.1.13 and earlier and 2.2.0 through 2.2.1 allows attackers to replace copied file data with zeros. The dnode_is_dirty check can ignore dirty data records, causing lseek with SEEK_DATA to report no data and cp to punch a full-file hole. Reachability requires a concurrent append to a newly created ZFS file while sparse-copy logic scans it; zeroed access-control files can disable protections.

CVSS severity7.5
High
EPSS probability1.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

File corruption in OpenZFS 2.1.13 and earlier and 2.2.0 through 2.2.1 allows attackers to replace copied file data with zeros. The dnode_is_dirty check can ignore dirty data records, causing lseek with SEEK_DATA to report no data and cp to punch a full-file hole. Reachability requires a concurrent append to a newly created ZFS file while sparse-copy logic scans it; zeroed access-control files can disable protections.

The record

CVE
CVE-2023-49298
Published
Nov 24, 2023
Updated
Nov 3, 2025
Vendor
OpenZFS
Product
OpenZFS
Classifications
CWE-639, T1565.001
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record 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=0 <=2.1.13
  2. Affected versionversion=2.2.0 <=2.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

OpenZFS · OpenZFSversion=0 <=2.1.13; version=2.2.0 <=2.2.1

Published CVSS scores

7.5NISTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
7.5UbuntuCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-639Authorization Bypass Through User-Controlled Key
T1565.001Stored Data Manipulation

Public exploit references

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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