CVE-2026-98484Hinoki check available

Rule-matching failure via stale catchall elements

Published Oct 18, 2026 · Updated Oct 18, 2026

Linux nf_tables has an expiration-check flaw that allows local users to disrupt catchall matching via set updates. nft_setelem_catchall_insert() and nft_setelem_catchall_deactivate() treat expired entries as live candidates, blocking reinsertion or selecting stale entries for deletion despite their absence from dumps. Triggering requires firewall-management privileges and timed catchall elements; matching failures persist until garbage collection, without a reported kernel crash.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Linux nf_tables has an expiration-check flaw that allows local users to disrupt catchall matching via set updates. nft_setelem_catchall_insert() and nft_setelem_catchall_deactivate() treat expired entries as live candidates, blocking reinsertion or selecting stale entries for deletion despite their absence from dumps. Triggering requires firewall-management privileges and timed catchall elements; matching failures persist until garbage collection, without a reported kernel crash.

The record

CVE
CVE-2026-98484
Published
Oct 18, 2026
Updated
Oct 18, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 18, 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=5.13
  2. Affected versionversion=aaa31047a6d25da0fa101da1ed544e1247949b40 <12cf803edfffef96f6415f0b5dbc7ec88842ea0f
  3. Affected versionversion=aaa31047a6d25da0fa101da1ed544e1247949b40 <2f07da3881525f7cbfed1ced2796c71a201505b9
  4. Affected versionversion=aaa31047a6d25da0fa101da1ed544e1247949b40 <4fb8b1ccc475651e480e509de126bb9ce7f3cff9
  5. Affected versionversion=aaa31047a6d25da0fa101da1ed544e1247949b40 <70194dc37670bd08e44b471389861cc01bd3a3c9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.13; version=aaa31047a6d25da0fa101da1ed544e1247949b40 <12cf803edfffef96f6415f0b5dbc7ec88842ea0f; version=aaa31047a6d25da0fa101da1ed544e1247949b40 <2f07da3881525f7cbfed1ced2796c71a201505b9; version=aaa31047a6d25da0fa101da1ed544e1247949b40 <4fb8b1ccc475651e480e509de126bb9ce7f3cff9; version=aaa31047a6d25da0fa101da1ed544e1247949b40 <70194dc37670bd08e44b471389861cc01bd3a3c9

Published CVSS scores

No CVSS assessment is available in this record.

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.

Activity data is delayed. The latest report is Sep 28, 2026.

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

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
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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