CVE-2026-97552Public exploit

Filesystem shutdown via uninitialized XFS error return

Published Sep 25, 2026 · Updated Sep 25, 2026

Improper initialization in affected Linux kernels allows local users to shut down an XFS filesystem during online repair. The xfs_defer_finish_one function returns an uninitialized error value when an item-less deferred-work list skips its loop, and xfs_defer_finish_noroll treats a nonzero value as fatal in-core corruption. Reaching the flaw requires privileged XFS online repair on a kernel built with CONFIG_XFS_ONLINE_REPAIR; the bounded consequence is shutdown of the affected filesystem.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper initialization in affected Linux kernels allows local users to shut down an XFS filesystem during online repair. The xfs_defer_finish_one function returns an uninitialized error value when an item-less deferred-work list skips its loop, and xfs_defer_finish_noroll treats a nonzero value as fatal in-core corruption. Reaching the flaw requires privileged XFS online repair on a kernel built with CONFIG_XFS_ONLINE_REPAIR; the bounded consequence is shutdown of the affected filesystem.

The record

CVE
CVE-2026-97552
Published
Sep 25, 2026
Updated
Sep 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Sep 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 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=3f3cec031099c37513727efc978a12b6346e326d <30748a24b9f04f9a83599ba907cc8fbff0729f3c
  2. Affected versionversion=3f3cec031099c37513727efc978a12b6346e326d <6176d21d7bd609632c5b7e87a3adb9be29ec1e72
  3. Affected versionversion=3f3cec031099c37513727efc978a12b6346e326d <6b507c239884f7d4bf8339f6e9eb8bfcb540afde
  4. Affected versionversion=3f3cec031099c37513727efc978a12b6346e326d <ba949a14446b7346e92e676ee3fe2bb79d9ce450
  5. Affected versionversion=6.8

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=3f3cec031099c37513727efc978a12b6346e326d <30748a24b9f04f9a83599ba907cc8fbff0729f3c; version=3f3cec031099c37513727efc978a12b6346e326d <6176d21d7bd609632c5b7e87a3adb9be29ec1e72; version=3f3cec031099c37513727efc978a12b6346e326d <6b507c239884f7d4bf8339f6e9eb8bfcb540afde; version=3f3cec031099c37513727efc978a12b6346e326d <ba949a14446b7346e92e676ee3fe2bb79d9ce450; version=6.8

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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

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No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

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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