CVE-2025-71183Network attack vector

Mount failure via omitted conflicting inode logging

Published Jan 31, 2026 · Updated Jan 31, 2026

Btrfs denial of service in Linux Kernel 4.6 and later allows remote attackers to cause mount failure via SMB2 rename and flush requests. copy_inode_items_to_log() skips conflicting ref/extref inodes created in an earlier transaction, leaving a stale name collision that replay treats as a deletion. A guest-writable Btrfs-backed ksmbd share and a subsequent unclean shutdown are required; replay aborts and leaves the filesystem unmounted.

CVSS severity9.1
Critical
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Btrfs denial of service in Linux Kernel 4.6 and later allows remote attackers to cause mount failure via SMB2 rename and flush requests. copy_inode_items_to_log() skips conflicting ref/extref inodes created in an earlier transaction, leaving a stale name collision that replay treats as a deletion. A guest-writable Btrfs-backed ksmbd share and a subsequent unclean shutdown are required; replay aborts and leaves the filesystem unmounted.

The record

CVE
CVE-2025-71183
Published
Jan 31, 2026
Updated
Jan 31, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 31, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 31, 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 <0c2413c69129f6ce60157f7b53d9ba880260400b
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7ba0b6461bc4edb3005ea6e00cdae189bcf908a5
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a63998cd6687c14b160dccb0bbcf281b2eb0dab3
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7f0207db68d5a1b4af23acbef1a8e8ddc431ebb
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d52af58dd463821c5c516aebb031a58934f696ea

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c2413c69129f6ce60157f7b53d9ba880260400b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7ba0b6461bc4edb3005ea6e00cdae189bcf908a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a63998cd6687c14b160dccb0bbcf281b2eb0dab3; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c7f0207db68d5a1b4af23acbef1a8e8ddc431ebb; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d52af58dd463821c5c516aebb031a58934f696ea

Published CVSS scores

9.1kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
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

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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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