CVE-2023-52587

Hard lockup via unlocked multicast-list iteration

Published Mar 6, 2024 · Updated May 11, 2026

Improper locking in Linux kernel IP over InfiniBand support allows local users to cause a hard system lockup during multicast cleanup. In ipoib_mcast_join_task(), the code releases priv->lock while iterating priv->multicast_list, allowing ipoib_mcast_dev_flush() to move the current entry to another list. Local low-privileged access and an active IPoIB interface are required; if the race occurs, the iterator spins forever and hard-locks the host.

CVSS severity5.5
Medium
EPSS probability0.31%
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 Linux kernel IP over InfiniBand support allows local users to cause a hard system lockup during multicast cleanup. In ipoib_mcast_join_task(), the code releases priv->lock while iterating priv->multicast_list, allowing ipoib_mcast_dev_flush() to move the current entry to another list. Local low-privileged access and an active IPoIB interface are required; if the race occurs, the iterator spins forever and hard-locks the host.

The record

CVE
CVE-2023-52587
Published
Mar 6, 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. Mar 6, 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=4.1
  2. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <342258fb46d66c1b4c7e2c3717ac01e10c03cf18
  3. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <4c8922ae8eb8dcc1e4b7d1059d97a8334288d825
  4. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <4f973e211b3b1c6d36f7c6a19239d258856749f9
  5. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <5108a2dc2db5630fb6cd58b8be80a0c134bc310a
  6. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <615e3adc2042b7be4ad122a043fc9135e6342c90
  7. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <7c7bd4d561e9dc6f5b7df9e184974915f6701a89
  8. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <ac2630fd3c90ffec34a0bfc4d413668538b0e8f2
  9. Affected versionversion=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <ed790bd0903ed3352ebf7f650d910f49b7319b34

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <342258fb46d66c1b4c7e2c3717ac01e10c03cf18; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <4c8922ae8eb8dcc1e4b7d1059d97a8334288d825; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <4f973e211b3b1c6d36f7c6a19239d258856749f9; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <5108a2dc2db5630fb6cd58b8be80a0c134bc310a; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <615e3adc2042b7be4ad122a043fc9135e6342c90; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <7c7bd4d561e9dc6f5b7df9e184974915f6701a89; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <ac2630fd3c90ffec34a0bfc4d413668538b0e8f2; version=d2fe937ce6ce23daf5fb214e45432dbb631581b7 <ed790bd0903ed3352ebf7f650d910f49b7319b34

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.

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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-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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