CVE-2025-22064

Service interruption via dormant-table hook rollback

Published Apr 16, 2025 · Updated May 23, 2026

Improper hook cleanup in the Linux kernel allows local users to interrupt service through a crafted nftables chain update. In nf_tables_updchain, an error after updating a dormant table sets the unregister flag even though no netdev hook was registered, so rollback calls __nf_unregister_net_hook on an unregistered hook. Exploitation requires local low-privilege access able to send nftables netlink updates; the observed result is a kernel warning and availability loss, without reported data access or modification.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper hook cleanup in the Linux kernel allows local users to interrupt service through a crafted nftables chain update. In nf_tables_updchain, an error after updating a dormant table sets the unregister flag even though no netdev hook was registered, so rollback calls __nf_unregister_net_hook on an unregistered hook. Exploitation requires local low-privilege access able to send nftables netlink updates; the observed result is a kernel warning and availability loss, without reported data access or modification.

The record

CVE
CVE-2025-22064
Published
Apr 16, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Apr 16, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=6.3.3 <6.4
  2. Affected versionversion=6.4
  3. Affected versionversion=b9703ed44ffbfba85c103b9de01886a225e14b38 <03d1fb457b696c18fe15661440c4f052b2374e7e
  4. Affected versionversion=b9703ed44ffbfba85c103b9de01886a225e14b38 <6134d1ea1e1408e8e7c8c26545b3b301cbdf1eda
  5. Affected versionversion=b9703ed44ffbfba85c103b9de01886a225e14b38 <688c15017d5cd5aac882400782e7213d40dc3556
  6. Affected versionversion=b9703ed44ffbfba85c103b9de01886a225e14b38 <ce571eba07d54e3637bf334bc48376fbfa55defe
  7. Affected versionversion=b9703ed44ffbfba85c103b9de01886a225e14b38 <feb1fa2a03a27fec7001e93e4223be4120d1784b
  8. Affected versionversion=d131ce7a319d3bff68d5a9d5509bb22e4ce33946

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.3.3 <6.4; version=6.4; version=b9703ed44ffbfba85c103b9de01886a225e14b38 <03d1fb457b696c18fe15661440c4f052b2374e7e; version=b9703ed44ffbfba85c103b9de01886a225e14b38 <6134d1ea1e1408e8e7c8c26545b3b301cbdf1eda; version=b9703ed44ffbfba85c103b9de01886a225e14b38 <688c15017d5cd5aac882400782e7213d40dc3556; version=b9703ed44ffbfba85c103b9de01886a225e14b38 <ce571eba07d54e3637bf334bc48376fbfa55defe; version=b9703ed44ffbfba85c103b9de01886a225e14b38 <feb1fa2a03a27fec7001e93e4223be4120d1784b; version=d131ce7a319d3bff68d5a9d5509bb22e4ce33946

Published CVSS scores

5.5OracleCVSS: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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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