CVE-2026-80879Hinoki check available

Filesystem hang via circular OCFS2 lock ordering

Published Sep 4, 2026 · Updated Sep 4, 2026

A locking flaw in the Linux OCFS2 direct-I/O completion path allows attackers to hang filesystem operations via concurrent inode activity. ocfs2_dio_end_io_write retains the EXTENT_ALLOC lock while ocfs2_del_inode_from_orphan acquires ORPHAN_DIR, completing a cycle with INODE_ALLOC. Reachability requires OCFS2 and a concurrent interleaving of unwritten-extent direct-I/O completion with inode creation and deletion; the bounded consequence is blocked filesystem work.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

A locking flaw in the Linux OCFS2 direct-I/O completion path allows attackers to hang filesystem operations via concurrent inode activity. ocfs2_dio_end_io_write retains the EXTENT_ALLOC lock while ocfs2_del_inode_from_orphan acquires ORPHAN_DIR, completing a cycle with INODE_ALLOC. Reachability requires OCFS2 and a concurrent interleaving of unwritten-extent direct-I/O completion with inode creation and deletion; the bounded consequence is blocked filesystem work.

The record

CVE
CVE-2026-80879
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=069c3fb310e9336cf48cfdf8748a32c29fd0193d
  2. Affected versionversion=1e99bb19994246514d63e656492904176f9d5edd <137e8b4823a9a11928428d4ec0a0cacb2f50a769
  3. Affected versionversion=3c636a3edca9c3f180b3079f94fe7e115730d9c6 <ae1f3460833d3e427420ab260278ec0e45d68c86
  4. Affected versionversion=5.10.258 <5.10.261
  5. Affected versionversion=5.15.209 <5.15.212
  6. Affected versionversion=6.1.175 <6.1.178
  7. Affected versionversion=6.12.86 <6.12.97
  8. Affected versionversion=6.18.27 <6.18.40
  9. Affected versionversion=6.6.140 <6.6.145
  10. Affected versionversion=7.0.4 <7.1
  11. Affected versionversion=7.1
  12. Affected versionversion=886f97fa59d0bbfa9859fb1a66dd9e014b522d89 <49b34bd3ad69611af03590a23abf2cda9ac1073d
  13. Affected versionversion=91e05ac2336d00d5b99fc774be4bd50039084796 <4273548e418bd935430d35e9d052870f323441f3
  14. Affected versionversion=97c03c0e9f73a5049794b3c69ee60fb5e8b0ebd8 <f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990
  15. Affected versionversion=d647c5b2fbf81560818dacade360abc8c00a9665 <f3dd1e534e9de64669415f8239e0094afecfed78
  16. Affected versionversion=d647c5b2fbf81560818dacade360abc8c00a9665 <ff6f26c58421614b02694ac9d219ac61d924bc68
  17. Affected versionversion=ea5bb1d20da756e4f41a48dad42b2e7d6e73f71e <ff187c502b39389b0d732cb7050a3db8e5ebfcd6

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=069c3fb310e9336cf48cfdf8748a32c29fd0193d; version=1e99bb19994246514d63e656492904176f9d5edd <137e8b4823a9a11928428d4ec0a0cacb2f50a769; version=3c636a3edca9c3f180b3079f94fe7e115730d9c6 <ae1f3460833d3e427420ab260278ec0e45d68c86; version=5.10.258 <5.10.261; version=5.15.209 <5.15.212; version=6.1.175 <6.1.178; version=6.12.86 <6.12.97; version=6.18.27 <6.18.40; version=6.6.140 <6.6.145; version=7.0.4 <7.1; version=7.1; version=886f97fa59d0bbfa9859fb1a66dd9e014b522d89 <49b34bd3ad69611af03590a23abf2cda9ac1073d; version=91e05ac2336d00d5b99fc774be4bd50039084796 <4273548e418bd935430d35e9d052870f323441f3; version=97c03c0e9f73a5049794b3c69ee60fb5e8b0ebd8 <f0ae0a6ca87dc2d4a789f71cdedb808ba6c16990; version=d647c5b2fbf81560818dacade360abc8c00a9665 <f3dd1e534e9de64669415f8239e0094afecfed78; version=d647c5b2fbf81560818dacade360abc8c00a9665 <ff6f26c58421614b02694ac9d219ac61d924bc68; version=ea5bb1d20da756e4f41a48dad42b2e7d6e73f71e <ff187c502b39389b0d732cb7050a3db8e5ebfcd6

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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