CVE-2024-42321

Service interruption via nftables packet tracing

Published Aug 17, 2024 · Updated May 11, 2026

Denial of service in the Linux kernel 5.2 and later allows local users to trigger a kernel warning through nftables packet tracing. nft_trace_init() calls __skb_get_hash() to identify traced packets, causing __skb_flow_dissect() to reach a WARN_ON_ONCE assertion when symmetric dissection is not requested. Low-privileged local access and active nftables tracing are required; the warning interrupts service where kernel warnings are configured to panic.

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

Denial of service in the Linux kernel 5.2 and later allows local users to trigger a kernel warning through nftables packet tracing. nft_trace_init() calls __skb_get_hash() to identify traced packets, causing __skb_flow_dissect() to reach a WARN_ON_ONCE assertion when symmetric dissection is not requested. Low-privileged local access and active nftables tracing are required; the warning interrupts service where kernel warnings are configured to panic.

The record

CVE
CVE-2024-42321
Published
Aug 17, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=5.2
  2. Affected versionversion=9b52e3f267a6835efd50ed9002d530666d16a411 <120f1c857a73e52132e473dee89b340440cb692b
  3. Affected versionversion=9b52e3f267a6835efd50ed9002d530666d16a411 <4afbac11f2f629d1e62817c4e210bdfaa7521107
  4. Affected versionversion=9b52e3f267a6835efd50ed9002d530666d16a411 <c5d21aabf1b31a79f228508af33aee83456bc1b0
  5. Affected versionversion=9b52e3f267a6835efd50ed9002d530666d16a411 <eb03d9826aa646577342a952d658d4598381c035

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.2; version=9b52e3f267a6835efd50ed9002d530666d16a411 <120f1c857a73e52132e473dee89b340440cb692b; version=9b52e3f267a6835efd50ed9002d530666d16a411 <4afbac11f2f629d1e62817c4e210bdfaa7521107; version=9b52e3f267a6835efd50ed9002d530666d16a411 <c5d21aabf1b31a79f228508af33aee83456bc1b0; version=9b52e3f267a6835efd50ed9002d530666d16a411 <eb03d9826aa646577342a952d658d4598381c035

Published CVSS scores

5.5UbuntuCVSS: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.

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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

T1499Endpoint Denial of Service

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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