CVE-2024-38557

System hang via recursive LAG lock acquisition

Published Jun 19, 2024 · Updated May 11, 2026

Improper locking in affected Linux kernel builds allows local users to hang systems through an mlx5 LAG mode change. When an IB representor reload fails, the eswitch error path also unloads Ethernet representors and mlx5_lag_remove_netdev attempts to reacquire the LAG lock already held by mlx5_lag_disable_change. Reachability requires local permission to reconfigure an mlx5 eswitch and a failed slave IB representor load; the resulting deadlock interrupts the affected host.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in affected Linux kernel builds allows local users to hang systems through an mlx5 LAG mode change. When an IB representor reload fails, the eswitch error path also unloads Ethernet representors and mlx5_lag_remove_netdev attempts to reacquire the LAG lock already held by mlx5_lag_disable_change. Reachability requires local permission to reconfigure an mlx5 eswitch and a failed slave IB representor load; the resulting deadlock interrupts the affected host.

The record

CVE
CVE-2024-38557
Published
Jun 19, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, 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=5.15
  2. Affected versionversion=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <0f06228d4a2dcc1fca5b3ddb0eefa09c05b102c4
  3. Affected versionversion=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <0f320f28f54b1b269a755be2e3fb3695e0b80b07
  4. Affected versionversion=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <e93fc8d959e56092e2eca1e5511c2d2f0ad6807a
  5. Affected versionversion=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <f03c714a0fdd1f93101a929d0e727c28a66383fc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.15; version=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <0f06228d4a2dcc1fca5b3ddb0eefa09c05b102c4; version=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <0f320f28f54b1b269a755be2e3fb3695e0b80b07; version=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <e93fc8d959e56092e2eca1e5511c2d2f0ad6807a; version=598fe77df855feeeca9dfda2ffe622ac7724e5c3 <f03c714a0fdd1f93101a929d0e727c28a66383fc

Published CVSS scores

5.5NISTCVSS: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-667Improper Locking
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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