CVE-2026-53207

System hang via recursive HugeTLB lock acquisition

Published Jun 25, 2026 · Updated Jun 25, 2026

Improper locking in the Linux Kernel HugeTLB memory-failure path allows local users to hang the system through concurrent page operations. The out path in __get_huge_page_for_hwpoison calls folio_put while hugetlb_lock remains held; a zero refcount then makes free_huge_folio reacquire the same nonrecursive lock. Exploitation requires CAP_SYS_ADMIN, CONFIG_MEMORY_FAILURE, two MADV_HWPOISON calls on one HugeTLB page, and a concurrent unmap; the resulting self-deadlock hangs the system.

CVSS severity5.5
Medium
EPSS probability0.13%
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 the Linux Kernel HugeTLB memory-failure path allows local users to hang the system through concurrent page operations. The out path in __get_huge_page_for_hwpoison calls folio_put while hugetlb_lock remains held; a zero refcount then makes free_huge_folio reacquire the same nonrecursive lock. Exploitation requires CAP_SYS_ADMIN, CONFIG_MEMORY_FAILURE, two MADV_HWPOISON calls on one HugeTLB page, and a concurrent unmap; the resulting self-deadlock hangs the system.

The record

CVE
CVE-2026-53207
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=405ce051236cc65b30bbfe490b28ce60ae6aed85 <3c2d42b8ee345b17a4ba56b0f6492d1ff4c1178e
  2. Affected versionversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <77b73b54801ae7137479c141fd0473a491c1dc48
  3. Affected versionversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <a33bfed648c10f5a1519981dbfad80841191edc8
  4. Affected versionversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <bf7ba8f96c258c30393814491930ae4ecdc5fe5e
  5. Affected versionversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <dd77a83915b07e2b0205adb284f08b39ae31dc4b
  6. Affected versionversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <fc3ff42cb0cbf947e4600ae9761c3783760050e2
  7. Affected versionversion=5.15.54 <5.16
  8. Affected versionversion=5.18
  9. Affected versionversion=62d1655b922958826b7ec22682c3141746f75064

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=405ce051236cc65b30bbfe490b28ce60ae6aed85 <3c2d42b8ee345b17a4ba56b0f6492d1ff4c1178e; version=405ce051236cc65b30bbfe490b28ce60ae6aed85 <77b73b54801ae7137479c141fd0473a491c1dc48; version=405ce051236cc65b30bbfe490b28ce60ae6aed85 <a33bfed648c10f5a1519981dbfad80841191edc8; version=405ce051236cc65b30bbfe490b28ce60ae6aed85 <bf7ba8f96c258c30393814491930ae4ecdc5fe5e; version=405ce051236cc65b30bbfe490b28ce60ae6aed85 <dd77a83915b07e2b0205adb284f08b39ae31dc4b; version=405ce051236cc65b30bbfe490b28ce60ae6aed85 <fc3ff42cb0cbf947e4600ae9761c3783760050e2; version=5.15.54 <5.16; version=5.18; version=62d1655b922958826b7ec22682c3141746f75064

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

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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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

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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