CVE-2024-27018

Kernel warning via repeated conntrack confirmation

Published May 1, 2024 · Updated Aug 5, 2026

Improper packet handling in affected Linux kernel releases allows local users to trigger warnings via promiscuous bridge traffic. The br_netfilter input path sends cloned packets intended for taps through br_nf_local_in, which confirms an already-associated conntrack object. Reachability requires a promiscuous bridge, br_netfilter processing, and traffic directed to a tap; published evidence demonstrates warning splats, not a crash.

CVSS severity7.8
High
EPSS probability0.64%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper packet handling in affected Linux kernel releases allows local users to trigger warnings via promiscuous bridge traffic. The br_netfilter input path sends cloned packets intended for taps through br_nf_local_in, which confirms an already-associated conntrack object. Reachability requires a promiscuous bridge, br_netfilter processing, and traffic directed to a tap; published evidence demonstrates warning splats, not a crash.

The record

CVE
CVE-2024-27018
Published
May 1, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=2b1414d5e94e477edff1d2c79030f1d742625ea0 <b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6
  2. Affected versionversion=5.15.151 <5.15.157
  3. Affected versionversion=6.1.81 <6.1.88
  4. Affected versionversion=62e7151ae3eb465e0ab52a20c941ff33bb6332e9 <43193174510ea4f3ce09b796e559a2fd9f148615
  5. Affected versionversion=62e7151ae3eb465e0ab52a20c941ff33bb6332e9 <751de2012eafa4d46d8081056761fa0e9cc8a178
  6. Affected versionversion=6.6.21 <6.6.29
  7. Affected versionversion=6.7.9 <6.8
  8. Affected versionversion=6.8
  9. Affected versionversion=7c3f28599652acf431a2211168de4a583f30b6d5 <dceb683ab87ca3666a9bb5c0158528b646faedc4
  10. Affected versionversion=80cd0487f630b5382734997c3e5e3003a77db315 <3f59ac29dea0921637053908fe99268d157bbb9d
  11. Affected versionversion=cb734975b0ffa688ff6cc0eed463865bf07b6c01

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2b1414d5e94e477edff1d2c79030f1d742625ea0 <b13db0d16bc7b2a52abcf5cb71334f63faa5dbd6; version=5.15.151 <5.15.157; version=6.1.81 <6.1.88; version=62e7151ae3eb465e0ab52a20c941ff33bb6332e9 <43193174510ea4f3ce09b796e559a2fd9f148615; version=62e7151ae3eb465e0ab52a20c941ff33bb6332e9 <751de2012eafa4d46d8081056761fa0e9cc8a178; version=6.6.21 <6.6.29; version=6.7.9 <6.8; version=6.8; version=7c3f28599652acf431a2211168de4a583f30b6d5 <dceb683ab87ca3666a9bb5c0158528b646faedc4; version=80cd0487f630b5382734997c3e5e3003a77db315 <3f59ac29dea0921637053908fe99268d157bbb9d; version=cb734975b0ffa688ff6cc0eed463865bf07b6c01

Published CVSS scores

7.8NIST NVDCVSS: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 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

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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