CVE-2026-53272

Memory corruption via EROFS unmount race

Published Jun 25, 2026 · Updated Jun 25, 2026

Use-after-free in the EROFS decompressor in Linux Kernel allows local users to corrupt memory during filesystem unmount. I/O completion queues z_erofs_decompressqueue_work asynchronously, while unmount frees sbi before the worker reads sbi->sync_decompress. Reaching the race requires CAP_SYS_ADMIN to mount and unmount an EROFS filesystem; the published record does not establish code execution.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the EROFS decompressor in Linux Kernel allows local users to corrupt memory during filesystem unmount. I/O completion queues z_erofs_decompressqueue_work asynchronously, while unmount frees sbi before the worker reads sbi->sync_decompress. Reaching the race requires CAP_SYS_ADMIN to mount and unmount an EROFS filesystem; the published record does not establish code execution.

The record

CVE
CVE-2026-53272
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416
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?

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  1. Affected versionversion=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <00bf6868df65fa95b3854996246d15759fdc7070
  2. Affected versionversion=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <1aee05e814d292064bf5fa15733741040cdc48ba
  3. Affected versionversion=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <86ab00cf81d44b675bb23db62b88fd76c8ac8cea
  4. Affected versionversion=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <95caf60da33d87ed26c28993620f0d92487b0296
  5. Affected versionversion=5.17

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linux Kernelversion=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <00bf6868df65fa95b3854996246d15759fdc7070; version=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <1aee05e814d292064bf5fa15733741040cdc48ba; version=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <86ab00cf81d44b675bb23db62b88fd76c8ac8cea; version=40452ffca3c1a0f2994e826f9fa213b107f1a2d4 <95caf60da33d87ed26c28993620f0d92487b0296; version=5.17

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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