CVE-2025-71194

Filesystem transaction hang via unconditional blocked-state wait

Published Feb 4, 2026 · Updated Feb 4, 2026

A deadlock in Linux Kernel btrfs allows attackers to hang filesystem transactions during ordered I/O and a concurrent commit. The wait_current_trans() path waits unconditionally on a blocked transaction because it fails to test the requested transaction type against btrfs_blocked_trans_types[]. Reachability requires a TRANS_JOIN ordered-extent worker to race with a transaction entering commit; the circular wait stalls that transaction and its pending extent.

CVSS severityUnavailable
Unscored
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

A deadlock in Linux Kernel btrfs allows attackers to hang filesystem transactions during ordered I/O and a concurrent commit. The wait_current_trans() path waits unconditionally on a blocked transaction because it fails to test the requested transaction type against btrfs_blocked_trans_types[]. Reachability requires a TRANS_JOIN ordered-extent worker to race with a transaction entering commit; the circular wait stalls that transaction and its pending extent.

The record

CVE
CVE-2025-71194
Published
Feb 4, 2026
Updated
Feb 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5037b342825df7094a4906d1e2a9674baab50cb2
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b0bb145d3bc264360f525c9717653be3522e528
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <99da896614d17e8a84aeb2b2d464ac046cc8633d
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ac63333d600732a56b35ee1fa46836da671eb50

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5037b342825df7094a4906d1e2a9674baab50cb2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8b0bb145d3bc264360f525c9717653be3522e528; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <99da896614d17e8a84aeb2b2d464ac046cc8633d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9ac63333d600732a56b35ee1fa46836da671eb50

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.

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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

T1499.004Endpoint Denial of Service: Application 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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