CVE-2024-27415

Kernel crash via shared conntrack confirmation race

Published May 17, 2024 · Updated Aug 5, 2026

Race condition in Linux bridge netfilter allows local users to crash the kernel through bridged multicast or broadcast traffic. nf_confirm races because bridge and macvlan clones retain the same unconfirmed nf_conn entry while the normal receive path and broadcast worker confirm it concurrently. Reachability requires bridge netfilter, macvlan forwarding, and rules that drop clones before postrouting confirmation; a successful race interrupts service.

CVSS severity4.7
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux bridge netfilter allows local users to crash the kernel through bridged multicast or broadcast traffic. nf_confirm races because bridge and macvlan clones retain the same unconfirmed nf_conn entry while the normal receive path and broadcast worker confirm it concurrently. Reachability requires bridge netfilter, macvlan forwarding, and rules that drop clones before postrouting confirmation; a successful race interrupts service.

The record

CVE
CVE-2024-27415
Published
May 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CAPEC-26, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 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

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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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b1414d5e94e477edff1d2c79030f1d742625ea0
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62e7151ae3eb465e0ab52a20c941ff33bb6332e9
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c3f28599652acf431a2211168de4a583f30b6d5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80cd0487f630b5382734997c3e5e3003a77db315
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cb734975b0ffa688ff6cc0eed463865bf07b6c01
  6. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b1414d5e94e477edff1d2c79030f1d742625ea0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <62e7151ae3eb465e0ab52a20c941ff33bb6332e9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7c3f28599652acf431a2211168de4a583f30b6d5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80cd0487f630b5382734997c3e5e3003a77db315; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cb734975b0ffa688ff6cc0eed463865bf07b6c01; version=2.6.12

Published CVSS scores

8.8kernel.orgCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.7NIST NVDCVSS:3.1/AV:L/AC:H/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.

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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

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CAPEC-26Leveraging Race Conditions
T1499.004Application 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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