CVE-2022-49698

Preemption-safety violation via per-CPU random state access

Published Feb 26, 2025 · Updated May 11, 2026

Concurrency error in Linux netfilter allows local users to trigger unsafe per-CPU random-state access through nft_numgen rules. The nft_ng_random_eval path calls the per-CPU prandom state from a preemptible local-output context, causing smp_processor_id() to run where migration is possible. Low-privileged local access and an exercised nft_numgen rule are required; published material documents the kernel warning but does not specify the resulting security consequence.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Concurrency error in Linux netfilter allows local users to trigger unsafe per-CPU random-state access through nft_numgen rules. The nft_ng_random_eval path calls the per-CPU prandom state from a preemptible local-output context, causing smp_processor_id() to run where migration is possible. Low-privileged local access and an exercised nft_numgen rule are required; published material documents the kernel warning but does not specify the resulting security consequence.

The record

CVE
CVE-2022-49698
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=4.18
  2. Affected versionversion=978d8f9055c3a7c35db2ac99cd2580b993396e33 <15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b
  3. Affected versionversion=978d8f9055c3a7c35db2ac99cd2580b993396e33 <6ce71f83f798be7e1ca68707fec449fbecb38852
  4. Affected versionversion=978d8f9055c3a7c35db2ac99cd2580b993396e33 <b1fd94e704571f98b21027340eecf821b2bdffba
  5. Affected versionversion=978d8f9055c3a7c35db2ac99cd2580b993396e33 <d0906b0fffc9f19bc42708ca3e84e2089088386c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.18; version=978d8f9055c3a7c35db2ac99cd2580b993396e33 <15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b; version=978d8f9055c3a7c35db2ac99cd2580b993396e33 <6ce71f83f798be7e1ca68707fec449fbecb38852; version=978d8f9055c3a7c35db2ac99cd2580b993396e33 <b1fd94e704571f98b21027340eecf821b2bdffba; version=978d8f9055c3a7c35db2ac99cd2580b993396e33 <d0906b0fffc9f19bc42708ca3e84e2089088386c

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

No sourced classifications are available.

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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