CVE-2022-48643Public exploit

Kernel warning via nf_tables counter underflow

Published Apr 28, 2024 · Updated May 11, 2026

Integer underflow in Linux netfilter nf_tables allows local users to trigger a kernel warning through a crafted chain-add operation. During nf_tables_addchain(), nft_basechain_init() sets NFT_CHAIN_BASE before a later error invokes nf_tables_chain_destroy(), which decrements nft_counters_enabled before its matching increment. Reaching the path requires local low-privilege access; hosts configured to panic on kernel warnings can crash or reboot.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer underflow in Linux netfilter nf_tables allows local users to trigger a kernel warning through a crafted chain-add operation. During nf_tables_addchain(), nft_basechain_init() sets NFT_CHAIN_BASE before a later error invokes nf_tables_chain_destroy(), which decrements nft_counters_enabled before its matching increment. Reaching the path requires local low-privilege access; hosts configured to panic on kernel warnings can crash or reboot.

The record

CVE
CVE-2022-48643
Published
Apr 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-191, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 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

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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=43eb8949cfdffa764b92bc6c54b87cbe5b0003fe <921ebde3c0d22c8cba74ce8eb3cc4626abff1ccd
  2. Affected versionversion=5.10.140 <5.10.146
  3. Affected versionversion=5.15.64 <5.15.71
  4. Affected versionversion=5.19.6 <5.19.12
  5. Affected versionversion=6d7ddee503951641f3ec6f0e3269446970bbcdab <91aa52652f4b37089aff3cb53e83049d826fef6d
  6. Affected versionversion=98a621ef45e3605c7487f7fa6fec7df94697d6a2 <8bcad2a931313aeba076b76922d5813ef97d0a91
  7. Affected versionversion=c907dfe4eaca9665694a0340de1458a093abe354 <710e3f526bd23a0d33435dedc52c3144de284378

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=43eb8949cfdffa764b92bc6c54b87cbe5b0003fe <921ebde3c0d22c8cba74ce8eb3cc4626abff1ccd; version=5.10.140 <5.10.146; version=5.15.64 <5.15.71; version=5.19.6 <5.19.12; version=6d7ddee503951641f3ec6f0e3269446970bbcdab <91aa52652f4b37089aff3cb53e83049d826fef6d; version=98a621ef45e3605c7487f7fa6fec7df94697d6a2 <8bcad2a931313aeba076b76922d5813ef97d0a91; version=c907dfe4eaca9665694a0340de1458a093abe354 <710e3f526bd23a0d33435dedc52c3144de284378

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5Canonical UbuntuCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-191Integer Underflow (Wrap or Wraparound)
T1499Endpoint Denial of Service

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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