CVE-2022-49558

Local service interruption via double hook unregistration

Published Feb 26, 2025 · Updated May 23, 2026

A double-unregistration flaw in Linux kernel nf_tables allows local users to interrupt service during network-namespace teardown. __nft_release_hooks unregisters netdev hooks during pre_exit, and the later NETDEV_UNREGISTER event unregisters the same hooks again. Low-privileged local access is required, and exposure depends on nf_tables flowtable hooks being released during network-namespace teardown.

CVSS severity5.5
Medium
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

A double-unregistration flaw in Linux kernel nf_tables allows local users to interrupt service during network-namespace teardown. __nft_release_hooks unregisters netdev hooks during pre_exit, and the later NETDEV_UNREGISTER event unregisters the same hooks again. Low-privileged local access is required, and exposure depends on nf_tables flowtable hooks being released during network-namespace teardown.

The record

CVE
CVE-2022-49558
Published
Feb 26, 2025
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0a0e5d47670b753d3dbf88f3c77a97a30864d9bd <3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82
  2. Affected versionversion=5.10.17 <5.10.198
  3. Affected versionversion=5.11
  4. Affected versionversion=5.4.99 <5.4.262
  5. Affected versionversion=767d1216bff82507c945e92fe719dff2083bb2f4 <86c0154f4c3a56c5db8b9dd09e3ce885382c2c19
  6. Affected versionversion=767d1216bff82507c945e92fe719dff2083bb2f4 <9c413a8c8bb49cc16796371805ecb260e885bb2b
  7. Affected versionversion=767d1216bff82507c945e92fe719dff2083bb2f4 <a3940dcf552f2393d1e8f263b386593f98abe829
  8. Affected versionversion=767d1216bff82507c945e92fe719dff2083bb2f4 <f9a43007d3f7ba76d5e7f9421094f00f2ef202f8
  9. Affected versionversion=b110391d1e806167254d3c7ae5d637191d913175 <b09e6ccf0d12f9356e8e3508d3e3dce126298538

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0a0e5d47670b753d3dbf88f3c77a97a30864d9bd <3fac8ce48fa9fd61ee9056d3ed48b2edefca8b82; version=5.10.17 <5.10.198; version=5.11; version=5.4.99 <5.4.262; version=767d1216bff82507c945e92fe719dff2083bb2f4 <86c0154f4c3a56c5db8b9dd09e3ce885382c2c19; version=767d1216bff82507c945e92fe719dff2083bb2f4 <9c413a8c8bb49cc16796371805ecb260e885bb2b; version=767d1216bff82507c945e92fe719dff2083bb2f4 <a3940dcf552f2393d1e8f263b386593f98abe829; version=767d1216bff82507c945e92fe719dff2083bb2f4 <f9a43007d3f7ba76d5e7f9421094f00f2ef202f8; version=b110391d1e806167254d3c7ae5d637191d913175 <b09e6ccf0d12f9356e8e3508d3e3dce126298538

Published CVSS scores

5.5NVDCVSS: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.

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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