CVE-2024-26987

System hang via hugetlb vmemmap lock inversion

Published May 1, 2024 · Updated May 11, 2026

Deadlock in Linux kernel branches before 6.1.88, 6.6.29, 6.8.8, and 6.9 allows local users to hang the system. The memory-failure path restores hugetlb vmemmap while holding pcp_batch_high_lock, then acquires cpu_hotplug_lock in the reverse order used by CPU bring-up. Affected code begins at 5.18; reachability requires local privileges, hugetlb_optimize_vmemmap, and a hard-offline request.

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

Deadlock in Linux kernel branches before 6.1.88, 6.6.29, 6.8.8, and 6.9 allows local users to hang the system. The memory-failure path restores hugetlb vmemmap while holding pcp_batch_high_lock, then acquires cpu_hotplug_lock in the reverse order used by CPU bring-up. Affected code begins at 5.18; reachability requires local privileges, hugetlb_optimize_vmemmap, and a hard-offline request.

The record

CVE
CVE-2024-26987
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=5.18
  2. Affected versionversion=a6b40850c442bf996e729e1d441d3dbc37cea171 <1983184c22dd84a4d95a71e5c6775c2638557dc7
  3. Affected versionversion=a6b40850c442bf996e729e1d441d3dbc37cea171 <49955b24002dc16a0ae2e83a57a2a6c863a1845c
  4. Affected versionversion=a6b40850c442bf996e729e1d441d3dbc37cea171 <5ef7ba2799a3b5ed292b8f6407376e2c25ef002e
  5. Affected versionversion=a6b40850c442bf996e729e1d441d3dbc37cea171 <882e1180c83f5b75bae03d0ccc31ccedfe5159de

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.18; version=a6b40850c442bf996e729e1d441d3dbc37cea171 <1983184c22dd84a4d95a71e5c6775c2638557dc7; version=a6b40850c442bf996e729e1d441d3dbc37cea171 <49955b24002dc16a0ae2e83a57a2a6c863a1845c; version=a6b40850c442bf996e729e1d441d3dbc37cea171 <5ef7ba2799a3b5ed292b8f6407376e2c25ef002e; version=a6b40850c442bf996e729e1d441d3dbc37cea171 <882e1180c83f5b75bae03d0ccc31ccedfe5159de

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS: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

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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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