CVE-2024-38593

Kernel crash via unchecked PTP worker cancellation

Published Jun 19, 2024 · Updated May 11, 2026

Denial of service in the Micrel LAN8841 PHY driver in Linux allows local users to crash the kernel by cycling an affected port. The lan8841_suspend function calls ptp_cancel_worker_sync with ptp_priv->ptp_clock even when that pointer was never initialized. Local users need control of a LAN8841 port on a kernel built without NETWORK_PHY_TIMESTAMPING; bringing the port up and down causes a kernel crash and service interruption.

CVSS severity5.5
Medium
EPSS probability0.22%
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 Micrel LAN8841 PHY driver in Linux allows local users to crash the kernel by cycling an affected port. The lan8841_suspend function calls ptp_cancel_worker_sync with ptp_priv->ptp_clock even when that pointer was never initialized. Local users need control of a LAN8841 port on a kernel built without NETWORK_PHY_TIMESTAMPING; bringing the port up and down causes a kernel crash and service interruption.

The record

CVE
CVE-2024-38593
Published
Jun 19, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 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=6.5
  2. Affected versionversion=cc75549548482ed653c23f212544e58cb38ea980 <3ddf170e4a604f5d4d9459a36993f5e92b53e8b0
  3. Affected versionversion=cc75549548482ed653c23f212544e58cb38ea980 <3fd4282d5f25c3c97fef3ef0b89b82ef4e2bc975
  4. Affected versionversion=cc75549548482ed653c23f212544e58cb38ea980 <64a47cf634ae44e92be24ebc982410841093bd7b
  5. Affected versionversion=cc75549548482ed653c23f212544e58cb38ea980 <aea27a92a41dae14843f92c79e9e42d8f570105c

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.5; version=cc75549548482ed653c23f212544e58cb38ea980 <3ddf170e4a604f5d4d9459a36993f5e92b53e8b0; version=cc75549548482ed653c23f212544e58cb38ea980 <3fd4282d5f25c3c97fef3ef0b89b82ef4e2bc975; version=cc75549548482ed653c23f212544e58cb38ea980 <64a47cf634ae44e92be24ebc982410841093bd7b; version=cc75549548482ed653c23f212544e58cb38ea980 <aea27a92a41dae14843f92c79e9e42d8f570105c

Published CVSS scores

5.5CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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 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 exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource
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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