CVE-2022-48974

Kernel warning via non-atomic conntrack statistics update

Published Oct 21, 2024 · Updated May 11, 2026

A concurrency flaw in Linux kernel 5.19 through 6.0.12 allows local users to trigger a kernel warning through conntrack netlink requests. Failed extension validation in nf_conntrack_hash_check_insert() and __nf_conntrack_confirm() increments per-CPU statistics non-atomically while execution is preemptible. Low-privileged local access and a failing conntrack extension check are required; the published assessment limits direct impact to availability.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A concurrency flaw in Linux kernel 5.19 through 6.0.12 allows local users to trigger a kernel warning through conntrack netlink requests. Failed extension validation in nf_conntrack_hash_check_insert() and __nf_conntrack_confirm() increments per-CPU statistics non-atomically while execution is preemptible. Low-privileged local access and a failing conntrack extension check are required; the published assessment limits direct impact to availability.

The record

CVE
CVE-2022-48974
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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

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=5.19
  2. Affected versionversion=c56716c69ce1ac320432fb1ea5654196ba24d2f8 <9464d0b68f11a9bc768370c3260ec02b3550447b
  3. Affected versionversion=c56716c69ce1ac320432fb1ea5654196ba24d2f8 <d9bf1138a5db419db13bd9fcd3a7178d6bb20f7c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=c56716c69ce1ac320432fb1ea5654196ba24d2f8 <9464d0b68f11a9bc768370c3260ec02b3550447b; version=c56716c69ce1ac320432fb1ea5654196ba24d2f8 <d9bf1138a5db419db13bd9fcd3a7178d6bb20f7c

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.

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

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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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