CVE-2024-38594

Kernel warning via reinitialized EST mutex

Published Jun 19, 2024 · Updated May 23, 2026

A locking flaw in the Linux stmmac EST code allows local users to trigger a kernel warning through privileged traffic-control changes. The tc_setup_taprio function clears the entire EST structure with memset, erasing its embedded initialized mutex before trying to lock it again. Reaching the path requires local privilege to reconfigure TAPRIO scheduling on an stmmac interface with EST support; the documented consequence is the invalid-lock warning.

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

A locking flaw in the Linux stmmac EST code allows local users to trigger a kernel warning through privileged traffic-control changes. The tc_setup_taprio function clears the entire EST structure with memset, erasing its embedded initialized mutex before trying to lock it again. Reaching the path requires local privilege to reconfigure TAPRIO scheduling on an stmmac interface with EST support; the documented consequence is the invalid-lock warning.

The record

CVE
CVE-2024-38594
Published
Jun 19, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 19, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=5.10.62 <5.11
  2. Affected versionversion=5.13.14 <5.14
  3. Affected versionversion=5.14
  4. Affected versionversion=5ce4cc16d47186f0b76254e6f27beea25bafc1d9
  5. Affected versionversion=b2091d47a14e8e6b3f03d792c1b25255d60b3219
  6. Affected versionversion=b2aae654a4794ef898ad33a179f341eb610f6b85 <36ac9e7f2e5786bd37c5cd91132e1f39c29b8197
  7. Affected versionversion=b2aae654a4794ef898ad33a179f341eb610f6b85 <487f9030b1ef34bab123f2df2a4ccbe01ba84416
  8. Affected versionversion=b2aae654a4794ef898ad33a179f341eb610f6b85 <6f476aff2d8da1a189621c4c16a76a6c534e4312
  9. Affected versionversion=b2aae654a4794ef898ad33a179f341eb610f6b85 <b538fefeb1026aad9dcdcbb410c42b56dff8aae9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10.62 <5.11; version=5.13.14 <5.14; version=5.14; version=5ce4cc16d47186f0b76254e6f27beea25bafc1d9; version=b2091d47a14e8e6b3f03d792c1b25255d60b3219; version=b2aae654a4794ef898ad33a179f341eb610f6b85 <36ac9e7f2e5786bd37c5cd91132e1f39c29b8197; version=b2aae654a4794ef898ad33a179f341eb610f6b85 <487f9030b1ef34bab123f2df2a4ccbe01ba84416; version=b2aae654a4794ef898ad33a179f341eb610f6b85 <6f476aff2d8da1a189621c4c16a76a6c534e4312; version=b2aae654a4794ef898ad33a179f341eb610f6b85 <b538fefeb1026aad9dcdcbb410c42b56dff8aae9

Published CVSS scores

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.

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

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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